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videoio: update ffmpeg backend

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- fix compilation for old libraries
- update codec/tag selection logic
- add documentation note about MP4 container tags
This commit is contained in:
Alexander Alekhin 2015-06-08 12:58:02 +03:00
parent 424c2bddb3
commit 959d575292
2 changed files with 15 additions and 14 deletions
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4
modules/videoio/include/opencv2/videoio.hpp
View File

@ -564,7 +564,9 @@ public:
@param fourcc 4-character code of codec used to compress the frames. For example,
VideoWriter::fourcc('P','I','M','1') is a MPEG-1 codec, VideoWriter::fourcc('M','J','P','G') is a
motion-jpeg codec etc. List of codes can be obtained at [Video Codecs by
FOURCC](http://www.fourcc.org/codecs.php) page.
FOURCC](http://www.fourcc.org/codecs.php) page. FFMPEG backend with MP4 container natively uses
other values as fourcc code: see [ObjectType](http://www.mp4ra.org/codecs.html),
so you may receive a warning message from OpenCV about fourcc code conversion.
@param fps Framerate of the created video stream.
@param frameSize Size of the video frames.
@param isColor If it is not zero, the encoder will expect and encode color frames, otherwise it

25
modules/videoio/src/cap_ffmpeg_impl.hpp
View File

@ -1543,7 +1543,7 @@ void CvVideoWriter_FFMPEG::close()
#define CV_PRINTABLE_CHAR(ch) ((ch) < 32 ? '?' : (ch))
#define CV_TAG_TO_PRINTABLE_CHAR4(tag) CV_PRINTABLE_CHAR((tag) & 255), CV_PRINTABLE_CHAR(((tag) >> 8) & 255), CV_PRINTABLE_CHAR(((tag) >> 16) & 255), CV_PRINTABLE_CHAR(((tag) >> 24) & 255)
static inline bool cv_ff_codec_tag_match(const AVCodecTag *tags, enum AVCodecID id, unsigned int tag)
static inline bool cv_ff_codec_tag_match(const AVCodecTag *tags, CV_CODEC_ID id, unsigned int tag)
{
while (tags->id != AV_CODEC_ID_NONE)
{
@ -1553,7 +1553,7 @@ static inline bool cv_ff_codec_tag_match(const AVCodecTag *tags, enum AVCodecID
}
return false;
}
static inline bool cv_ff_codec_tag_list_match(const AVCodecTag *const *tags, enum AVCodecID id, unsigned int tag)
static inline bool cv_ff_codec_tag_list_match(const AVCodecTag *const *tags, CV_CODEC_ID id, unsigned int tag)
{
int i;
for (i = 0; tags && tags[i]; i++) {
@ -1611,21 +1611,24 @@ bool CvVideoWriter_FFMPEG::open( const char * filename, int fourcc,
#if LIBAVCODEC_VERSION_INT<((51<<16)+(49<<8)+0)
if( (codec_id = codec_get_bmp_id( fourcc )) == CV_CODEC(CODEC_ID_NONE) )
return false;
#elif LIBAVFORMAT_BUILD >= CALC_FFMPEG_VERSION(54, 1, 0)
// APIchnages:
// 2012-01-31 - dd6d3b0 - lavf 54.01.0
// Add avformat_get_riff_video_tags() and avformat_get_riff_audio_tags().
#else
if( (codec_id = av_codec_get_id(fmt->codec_tag, fourcc)) == CV_CODEC(CODEC_ID_NONE) )
{
const struct AVCodecTag * fallback_tags[] = {
#if LIBAVFORMAT_BUILD >= CALC_FFMPEG_VERSION(54, 1, 0)
// APIchanges:
// 2012-01-31 - dd6d3b0 - lavf 54.01.0
// Add avformat_get_riff_video_tags() and avformat_get_riff_audio_tags().
avformat_get_riff_video_tags(),
#if LIBAVFORMAT_BUILD >= CALC_FFMPEG_VERSION(55, 25, 100)
#endif
#if LIBAVFORMAT_BUILD >= CALC_FFMPEG_VERSION(55, 25, 100) && defined LIBAVFORMAT_VERSION_MICRO && LIBAVFORMAT_VERSION_MICRO >= 100
// APIchanges: ffmpeg only
// 2014-01-19 - 1a193c4 - lavf 55.25.100 - avformat.h
// Add avformat_get_mov_video_tags() and avformat_get_mov_audio_tags().
// TODO ffmpeg only, need to skip libav: avformat_get_mov_video_tags(),
avformat_get_mov_video_tags(),
#endif
codec_bmp_tags, NULL };
codec_bmp_tags, // fallback for avformat < 54.1
NULL };
if( (codec_id = av_codec_get_id(fallback_tags, fourcc)) == CV_CODEC(CODEC_ID_NONE) )
{
fflush(stdout);
@ -1650,10 +1653,6 @@ bool CvVideoWriter_FFMPEG::open( const char * filename, int fourcc,
fourcc = supported_tag;
}
}
#else
const struct AVCodecTag * tags[] = { codec_bmp_tags, NULL};
if( (codec_id = av_codec_get_id(tags, fourcc)) == CV_CODEC(CODEC_ID_NONE) )
return false;
#endif
// alloc memory for context