653 lines
21 KiB
C
653 lines
21 KiB
C
/*
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* AVI muxer
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* Copyright (c) 2000 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "avi.h"
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#include "riff.h"
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#include "libavutil/intreadwrite.h"
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/*
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* TODO:
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* - fill all fields if non streamed (nb_frames for example)
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*/
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typedef struct AVIIentry {
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unsigned int flags, pos, len;
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} AVIIentry;
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#define AVI_INDEX_CLUSTER_SIZE 16384
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typedef struct AVIIndex {
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int64_t indx_start;
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int entry;
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int ents_allocated;
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AVIIentry** cluster;
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} AVIIndex;
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typedef struct {
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int64_t riff_start, movi_list, odml_list;
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int64_t frames_hdr_all;
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int riff_id;
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} AVIContext;
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typedef struct {
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int64_t frames_hdr_strm;
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int audio_strm_length;
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int packet_count;
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int entry;
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AVIIndex indexes;
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} AVIStream ;
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static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
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{
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int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
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int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
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return &idx->cluster[cl][id];
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}
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static int64_t avi_start_new_riff(AVFormatContext *s, AVIOContext *pb,
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const char* riff_tag, const char* list_tag)
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{
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AVIContext *avi= s->priv_data;
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int64_t loff;
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int i;
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avi->riff_id++;
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for (i=0; i<s->nb_streams; i++){
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AVIStream *avist= s->streams[i]->priv_data;
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avist->indexes.entry = 0;
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}
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avi->riff_start = ff_start_tag(pb, "RIFF");
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put_tag(pb, riff_tag);
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loff = ff_start_tag(pb, "LIST");
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put_tag(pb, list_tag);
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return loff;
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}
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static char* avi_stream2fourcc(char* tag, int index, enum AVMediaType type)
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{
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tag[0] = '0' + index/10;
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tag[1] = '0' + index%10;
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if (type == AVMEDIA_TYPE_VIDEO) {
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tag[2] = 'd';
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tag[3] = 'c';
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} else if (type == AVMEDIA_TYPE_SUBTITLE) {
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// note: this is not an official code
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tag[2] = 's';
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tag[3] = 'b';
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} else {
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tag[2] = 'w';
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tag[3] = 'b';
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}
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tag[4] = '\0';
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return tag;
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}
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static void avi_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
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{
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int len = strlen(str);
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if (len > 0) {
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len++;
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put_tag(pb, tag);
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avio_wl32(pb, len);
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avio_put_str(pb, str);
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if (len & 1)
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avio_w8(pb, 0);
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}
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}
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static int avi_write_counters(AVFormatContext* s, int riff_id)
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{
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AVIOContext *pb = s->pb;
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AVIContext *avi = s->priv_data;
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int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
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int64_t file_size;
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AVCodecContext* stream;
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file_size = url_ftell(pb);
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for(n = 0; n < s->nb_streams; n++) {
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AVIStream *avist= s->streams[n]->priv_data;
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assert(avist->frames_hdr_strm);
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stream = s->streams[n]->codec;
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url_fseek(pb, avist->frames_hdr_strm, SEEK_SET);
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ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
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if(au_ssize == 0) {
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avio_wl32(pb, avist->packet_count);
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} else {
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avio_wl32(pb, avist->audio_strm_length / au_ssize);
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}
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if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
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nb_frames = FFMAX(nb_frames, avist->packet_count);
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}
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if(riff_id == 1) {
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assert(avi->frames_hdr_all);
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url_fseek(pb, avi->frames_hdr_all, SEEK_SET);
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avio_wl32(pb, nb_frames);
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}
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url_fseek(pb, file_size, SEEK_SET);
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return 0;
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}
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static int avi_write_header(AVFormatContext *s)
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{
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AVIContext *avi = s->priv_data;
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AVIOContext *pb = s->pb;
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int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
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AVCodecContext *stream, *video_enc;
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int64_t list1, list2, strh, strf;
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AVMetadataTag *t = NULL;
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if (s->nb_streams > AVI_MAX_STREAM_COUNT) {
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av_log(s, AV_LOG_ERROR, "AVI does not support >%d streams\n",
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AVI_MAX_STREAM_COUNT);
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return -1;
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}
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for(n=0;n<s->nb_streams;n++) {
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s->streams[n]->priv_data= av_mallocz(sizeof(AVIStream));
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if(!s->streams[n]->priv_data)
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return AVERROR(ENOMEM);
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}
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/* header list */
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avi->riff_id = 0;
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list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
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/* avi header */
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put_tag(pb, "avih");
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avio_wl32(pb, 14 * 4);
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bitrate = 0;
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video_enc = NULL;
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for(n=0;n<s->nb_streams;n++) {
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stream = s->streams[n]->codec;
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bitrate += stream->bit_rate;
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if (stream->codec_type == AVMEDIA_TYPE_VIDEO)
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video_enc = stream;
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}
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nb_frames = 0;
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if(video_enc){
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avio_wl32(pb, (uint32_t)(INT64_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
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} else {
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avio_wl32(pb, 0);
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}
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avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
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avio_wl32(pb, 0); /* padding */
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if (url_is_streamed(pb))
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avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
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else
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avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
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avi->frames_hdr_all = url_ftell(pb); /* remember this offset to fill later */
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avio_wl32(pb, nb_frames); /* nb frames, filled later */
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avio_wl32(pb, 0); /* initial frame */
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avio_wl32(pb, s->nb_streams); /* nb streams */
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avio_wl32(pb, 1024 * 1024); /* suggested buffer size */
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if(video_enc){
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avio_wl32(pb, video_enc->width);
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avio_wl32(pb, video_enc->height);
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} else {
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avio_wl32(pb, 0);
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avio_wl32(pb, 0);
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}
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avio_wl32(pb, 0); /* reserved */
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avio_wl32(pb, 0); /* reserved */
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avio_wl32(pb, 0); /* reserved */
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avio_wl32(pb, 0); /* reserved */
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/* stream list */
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for(i=0;i<n;i++) {
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AVIStream *avist= s->streams[i]->priv_data;
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list2 = ff_start_tag(pb, "LIST");
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put_tag(pb, "strl");
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stream = s->streams[i]->codec;
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/* stream generic header */
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strh = ff_start_tag(pb, "strh");
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switch(stream->codec_type) {
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case AVMEDIA_TYPE_SUBTITLE:
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// XSUB subtitles behave like video tracks, other subtitles
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// are not (yet) supported.
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if (stream->codec_id != CODEC_ID_XSUB) {
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av_log(s, AV_LOG_ERROR, "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
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return AVERROR_PATCHWELCOME;
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}
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case AVMEDIA_TYPE_VIDEO: put_tag(pb, "vids"); break;
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case AVMEDIA_TYPE_AUDIO: put_tag(pb, "auds"); break;
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// case AVMEDIA_TYPE_TEXT : put_tag(pb, "txts"); break;
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case AVMEDIA_TYPE_DATA : put_tag(pb, "dats"); break;
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}
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if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
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stream->codec_id == CODEC_ID_XSUB)
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avio_wl32(pb, stream->codec_tag);
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else
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avio_wl32(pb, 1);
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avio_wl32(pb, 0); /* flags */
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avio_wl16(pb, 0); /* priority */
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avio_wl16(pb, 0); /* language */
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avio_wl32(pb, 0); /* initial frame */
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ff_parse_specific_params(stream, &au_byterate, &au_ssize, &au_scale);
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avio_wl32(pb, au_scale); /* scale */
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avio_wl32(pb, au_byterate); /* rate */
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av_set_pts_info(s->streams[i], 64, au_scale, au_byterate);
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avio_wl32(pb, 0); /* start */
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avist->frames_hdr_strm = url_ftell(pb); /* remember this offset to fill later */
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if (url_is_streamed(pb))
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avio_wl32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
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else
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avio_wl32(pb, 0); /* length, XXX: filled later */
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/* suggested buffer size */ //FIXME set at the end to largest chunk
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if(stream->codec_type == AVMEDIA_TYPE_VIDEO)
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avio_wl32(pb, 1024 * 1024);
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else if(stream->codec_type == AVMEDIA_TYPE_AUDIO)
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avio_wl32(pb, 12 * 1024);
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else
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avio_wl32(pb, 0);
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avio_wl32(pb, -1); /* quality */
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avio_wl32(pb, au_ssize); /* sample size */
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avio_wl32(pb, 0);
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avio_wl16(pb, stream->width);
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avio_wl16(pb, stream->height);
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ff_end_tag(pb, strh);
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if(stream->codec_type != AVMEDIA_TYPE_DATA){
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strf = ff_start_tag(pb, "strf");
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switch(stream->codec_type) {
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case AVMEDIA_TYPE_SUBTITLE:
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// XSUB subtitles behave like video tracks, other subtitles
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// are not (yet) supported.
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if (stream->codec_id != CODEC_ID_XSUB) break;
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case AVMEDIA_TYPE_VIDEO:
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ff_put_bmp_header(pb, stream, ff_codec_bmp_tags, 0);
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break;
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case AVMEDIA_TYPE_AUDIO:
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if (ff_put_wav_header(pb, stream) < 0) {
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return -1;
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}
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break;
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default:
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return -1;
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}
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ff_end_tag(pb, strf);
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if ((t = av_metadata_get(s->streams[i]->metadata, "title", NULL, 0))) {
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avi_write_info_tag(s->pb, "strn", t->value);
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t = NULL;
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}
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}
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if (!url_is_streamed(pb)) {
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unsigned char tag[5];
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int j;
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/* Starting to lay out AVI OpenDML master index.
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* We want to make it JUNK entry for now, since we'd
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* like to get away without making AVI an OpenDML one
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* for compatibility reasons.
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*/
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avist->indexes.entry = avist->indexes.ents_allocated = 0;
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avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
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avio_wl16(pb, 4); /* wLongsPerEntry */
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avio_w8(pb, 0); /* bIndexSubType (0 == frame index) */
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avio_w8(pb, 0); /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
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avio_wl32(pb, 0); /* nEntriesInUse (will fill out later on) */
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put_tag(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
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/* dwChunkId */
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avio_wl64(pb, 0); /* dwReserved[3]
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avio_wl32(pb, 0); Must be 0. */
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for (j=0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
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avio_wl64(pb, 0);
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ff_end_tag(pb, avist->indexes.indx_start);
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}
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if( stream->codec_type == AVMEDIA_TYPE_VIDEO
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&& s->streams[i]->sample_aspect_ratio.num>0
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&& s->streams[i]->sample_aspect_ratio.den>0){
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int vprp= ff_start_tag(pb, "vprp");
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AVRational dar = av_mul_q(s->streams[i]->sample_aspect_ratio,
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(AVRational){stream->width, stream->height});
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int num, den;
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av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
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avio_wl32(pb, 0); //video format = unknown
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avio_wl32(pb, 0); //video standard= unknown
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avio_wl32(pb, lrintf(1.0/av_q2d(stream->time_base)));
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avio_wl32(pb, stream->width );
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avio_wl32(pb, stream->height);
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avio_wl16(pb, den);
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avio_wl16(pb, num);
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avio_wl32(pb, stream->width );
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avio_wl32(pb, stream->height);
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avio_wl32(pb, 1); //progressive FIXME
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avio_wl32(pb, stream->height);
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avio_wl32(pb, stream->width );
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avio_wl32(pb, stream->height);
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avio_wl32(pb, stream->width );
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avio_wl32(pb, 0);
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avio_wl32(pb, 0);
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avio_wl32(pb, 0);
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avio_wl32(pb, 0);
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ff_end_tag(pb, vprp);
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}
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ff_end_tag(pb, list2);
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}
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if (!url_is_streamed(pb)) {
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/* AVI could become an OpenDML one, if it grows beyond 2Gb range */
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avi->odml_list = ff_start_tag(pb, "JUNK");
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put_tag(pb, "odml");
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put_tag(pb, "dmlh");
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avio_wl32(pb, 248);
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for (i = 0; i < 248; i+= 4)
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avio_wl32(pb, 0);
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ff_end_tag(pb, avi->odml_list);
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}
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ff_end_tag(pb, list1);
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list2 = ff_start_tag(pb, "LIST");
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put_tag(pb, "INFO");
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ff_metadata_conv(&s->metadata, ff_avi_metadata_conv, NULL);
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for (i = 0; *ff_avi_tags[i]; i++) {
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if ((t = av_metadata_get(s->metadata, ff_avi_tags[i], NULL, AV_METADATA_MATCH_CASE)))
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avi_write_info_tag(s->pb, t->key, t->value);
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}
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ff_end_tag(pb, list2);
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/* some padding for easier tag editing */
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list2 = ff_start_tag(pb, "JUNK");
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for (i = 0; i < 1016; i += 4)
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avio_wl32(pb, 0);
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ff_end_tag(pb, list2);
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avi->movi_list = ff_start_tag(pb, "LIST");
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put_tag(pb, "movi");
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put_flush_packet(pb);
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return 0;
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}
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static int avi_write_ix(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVIContext *avi = s->priv_data;
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char tag[5];
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char ix_tag[] = "ix00";
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int i, j;
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assert(!url_is_streamed(pb));
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if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
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return -1;
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for (i=0;i<s->nb_streams;i++) {
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AVIStream *avist= s->streams[i]->priv_data;
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int64_t ix, pos;
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avi_stream2fourcc(&tag[0], i, s->streams[i]->codec->codec_type);
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ix_tag[3] = '0' + i;
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/* Writing AVI OpenDML leaf index chunk */
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ix = url_ftell(pb);
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put_tag(pb, &ix_tag[0]); /* ix?? */
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avio_wl32(pb, avist->indexes.entry * 8 + 24);
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/* chunk size */
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avio_wl16(pb, 2); /* wLongsPerEntry */
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avio_w8(pb, 0); /* bIndexSubType (0 == frame index) */
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avio_w8(pb, 1); /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
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avio_wl32(pb, avist->indexes.entry);
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/* nEntriesInUse */
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put_tag(pb, &tag[0]); /* dwChunkId */
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avio_wl64(pb, avi->movi_list);/* qwBaseOffset */
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avio_wl32(pb, 0); /* dwReserved_3 (must be 0) */
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for (j=0; j<avist->indexes.entry; j++) {
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AVIIentry* ie = avi_get_ientry(&avist->indexes, j);
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avio_wl32(pb, ie->pos + 8);
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avio_wl32(pb, ((uint32_t)ie->len & ~0x80000000) |
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(ie->flags & 0x10 ? 0 : 0x80000000));
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}
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put_flush_packet(pb);
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pos = url_ftell(pb);
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/* Updating one entry in the AVI OpenDML master index */
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url_fseek(pb, avist->indexes.indx_start - 8, SEEK_SET);
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put_tag(pb, "indx"); /* enabling this entry */
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url_fskip(pb, 8);
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avio_wl32(pb, avi->riff_id); /* nEntriesInUse */
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url_fskip(pb, 16*avi->riff_id);
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avio_wl64(pb, ix); /* qwOffset */
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avio_wl32(pb, pos - ix); /* dwSize */
|
|
avio_wl32(pb, avist->indexes.entry); /* dwDuration */
|
|
|
|
url_fseek(pb, pos, SEEK_SET);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int avi_write_idx1(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVIContext *avi = s->priv_data;
|
|
int64_t idx_chunk;
|
|
int i;
|
|
char tag[5];
|
|
|
|
if (!url_is_streamed(pb)) {
|
|
AVIStream *avist;
|
|
AVIIentry* ie = 0, *tie;
|
|
int empty, stream_id = -1;
|
|
|
|
idx_chunk = ff_start_tag(pb, "idx1");
|
|
for(i=0; i<s->nb_streams; i++){
|
|
avist= s->streams[i]->priv_data;
|
|
avist->entry=0;
|
|
}
|
|
|
|
do {
|
|
empty = 1;
|
|
for (i=0; i<s->nb_streams; i++) {
|
|
avist= s->streams[i]->priv_data;
|
|
if (avist->indexes.entry <= avist->entry)
|
|
continue;
|
|
|
|
tie = avi_get_ientry(&avist->indexes, avist->entry);
|
|
if (empty || tie->pos < ie->pos) {
|
|
ie = tie;
|
|
stream_id = i;
|
|
}
|
|
empty = 0;
|
|
}
|
|
if (!empty) {
|
|
avist= s->streams[stream_id]->priv_data;
|
|
avi_stream2fourcc(&tag[0], stream_id,
|
|
s->streams[stream_id]->codec->codec_type);
|
|
put_tag(pb, &tag[0]);
|
|
avio_wl32(pb, ie->flags);
|
|
avio_wl32(pb, ie->pos);
|
|
avio_wl32(pb, ie->len);
|
|
avist->entry++;
|
|
}
|
|
} while (!empty);
|
|
ff_end_tag(pb, idx_chunk);
|
|
|
|
avi_write_counters(s, avi->riff_id);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
unsigned char tag[5];
|
|
unsigned int flags=0;
|
|
const int stream_index= pkt->stream_index;
|
|
AVIStream *avist= s->streams[stream_index]->priv_data;
|
|
AVCodecContext *enc= s->streams[stream_index]->codec;
|
|
int size= pkt->size;
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %d\n", pkt->dts, avi->packet_count[stream_index], stream_index);
|
|
while(enc->block_align==0 && pkt->dts != AV_NOPTS_VALUE && pkt->dts > avist->packet_count){
|
|
AVPacket empty_packet;
|
|
|
|
av_init_packet(&empty_packet);
|
|
empty_packet.size= 0;
|
|
empty_packet.data= NULL;
|
|
empty_packet.stream_index= stream_index;
|
|
avi_write_packet(s, &empty_packet);
|
|
// av_log(s, AV_LOG_DEBUG, "dup %"PRId64" %d\n", pkt->dts, avi->packet_count[stream_index]);
|
|
}
|
|
avist->packet_count++;
|
|
|
|
// Make sure to put an OpenDML chunk when the file size exceeds the limits
|
|
if (!url_is_streamed(pb) &&
|
|
(url_ftell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
|
|
|
|
avi_write_ix(s);
|
|
ff_end_tag(pb, avi->movi_list);
|
|
|
|
if (avi->riff_id == 1)
|
|
avi_write_idx1(s);
|
|
|
|
ff_end_tag(pb, avi->riff_start);
|
|
avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
|
|
}
|
|
|
|
avi_stream2fourcc(&tag[0], stream_index, enc->codec_type);
|
|
if(pkt->flags&AV_PKT_FLAG_KEY)
|
|
flags = 0x10;
|
|
if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
|
|
avist->audio_strm_length += size;
|
|
}
|
|
|
|
if (!url_is_streamed(s->pb)) {
|
|
AVIIndex* idx = &avist->indexes;
|
|
int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
|
|
int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
|
|
if (idx->ents_allocated <= idx->entry) {
|
|
idx->cluster = av_realloc(idx->cluster, (cl+1)*sizeof(void*));
|
|
if (!idx->cluster)
|
|
return -1;
|
|
idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
|
|
if (!idx->cluster[cl])
|
|
return -1;
|
|
idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
|
|
}
|
|
|
|
idx->cluster[cl][id].flags = flags;
|
|
idx->cluster[cl][id].pos = url_ftell(pb) - avi->movi_list;
|
|
idx->cluster[cl][id].len = size;
|
|
idx->entry++;
|
|
}
|
|
|
|
avio_write(pb, tag, 4);
|
|
avio_wl32(pb, size);
|
|
avio_write(pb, pkt->data, size);
|
|
if (size & 1)
|
|
avio_w8(pb, 0);
|
|
|
|
put_flush_packet(pb);
|
|
return 0;
|
|
}
|
|
|
|
static int avi_write_trailer(AVFormatContext *s)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int res = 0;
|
|
int i, j, n, nb_frames;
|
|
int64_t file_size;
|
|
|
|
if (!url_is_streamed(pb)){
|
|
if (avi->riff_id == 1) {
|
|
ff_end_tag(pb, avi->movi_list);
|
|
res = avi_write_idx1(s);
|
|
ff_end_tag(pb, avi->riff_start);
|
|
} else {
|
|
avi_write_ix(s);
|
|
ff_end_tag(pb, avi->movi_list);
|
|
ff_end_tag(pb, avi->riff_start);
|
|
|
|
file_size = url_ftell(pb);
|
|
url_fseek(pb, avi->odml_list - 8, SEEK_SET);
|
|
put_tag(pb, "LIST"); /* Making this AVI OpenDML one */
|
|
url_fskip(pb, 16);
|
|
|
|
for (n=nb_frames=0;n<s->nb_streams;n++) {
|
|
AVCodecContext *stream = s->streams[n]->codec;
|
|
AVIStream *avist= s->streams[n]->priv_data;
|
|
|
|
if (stream->codec_type == AVMEDIA_TYPE_VIDEO) {
|
|
if (nb_frames < avist->packet_count)
|
|
nb_frames = avist->packet_count;
|
|
} else {
|
|
if (stream->codec_id == CODEC_ID_MP2 || stream->codec_id == CODEC_ID_MP3) {
|
|
nb_frames += avist->packet_count;
|
|
}
|
|
}
|
|
}
|
|
avio_wl32(pb, nb_frames);
|
|
url_fseek(pb, file_size, SEEK_SET);
|
|
|
|
avi_write_counters(s, avi->riff_id);
|
|
}
|
|
}
|
|
put_flush_packet(pb);
|
|
|
|
for (i=0; i<s->nb_streams; i++) {
|
|
AVIStream *avist= s->streams[i]->priv_data;
|
|
for (j=0; j<avist->indexes.ents_allocated/AVI_INDEX_CLUSTER_SIZE; j++)
|
|
av_free(avist->indexes.cluster[j]);
|
|
av_freep(&avist->indexes.cluster);
|
|
avist->indexes.ents_allocated = avist->indexes.entry = 0;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
AVOutputFormat ff_avi_muxer = {
|
|
"avi",
|
|
NULL_IF_CONFIG_SMALL("AVI format"),
|
|
"video/x-msvideo",
|
|
"avi",
|
|
sizeof(AVIContext),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG4,
|
|
avi_write_header,
|
|
avi_write_packet,
|
|
avi_write_trailer,
|
|
.codec_tag= (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, 0},
|
|
.flags= AVFMT_VARIABLE_FPS,
|
|
};
|