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Warn the user if mjpeg cbr encoding with frame threading was requested.

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This commit is contained in:
Carl Eugen Hoyos 2014-01-30 00:55:35 +01:00
parent 1a5e8511d4
commit e1cb6dc59e
1 changed files with 6 additions and 0 deletions
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6
libavcodec/frame_thread_encoder.c
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@ -133,6 +133,12 @@ int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
"or a constant quantizer if you want to use multiple cpu cores\n");
avctx->thread_count = 1;
}
if( avctx->thread_count > 1
&& avctx->codec_id == AV_CODEC_ID_MJPEG
&& !(avctx->flags & CODEC_FLAG_QSCALE))
av_log(avctx, AV_LOG_WARNING,
"MJPEG CBR encoding works badly with frame multi-threading, consider "
"using -threads 1, -thread_type slice or a constant quantizer.\n");
if(!avctx->thread_count) {
avctx->thread_count = av_cpu_count();
avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);