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lavf: let av_find_best_stream use bitrate info if available 

I guess the user expects to see the stream with the highest bitrate, not with
the most frames, this is especially useful for multi bitrate streams.

This patch changes av_find_best_stream to select the stream based on a number
of conditions, the first condition has the highest priority, the last condition
has the lowest:

1) Select the stream with the highest FFMIN(5, codec_info_nb_frames) value
2) Select the stream with the highest bitrate
3) Select the stream with the highest codec_info_nb_frames
4) Select the first stream

Signed-off-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Marton Balint 2012-11-18 13:19:14 +01:00 committed by Michael Niedermayer
parent 05001dd7ca
commit 4bee03034b
1 changed files with 10 additions and 3 deletions
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13
libavformat/utils.c
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@ -2949,7 +2949,7 @@ int av_find_best_stream(AVFormatContext *ic,
int flags)
{
int i, nb_streams = ic->nb_streams;
int ret = AVERROR_STREAM_NOT_FOUND, best_count = -1;
int ret = AVERROR_STREAM_NOT_FOUND, best_count = -1, best_bitrate = -1, best_multiframe = -1, count, bitrate, multiframe;
unsigned *program = NULL;
AVCodec *decoder = NULL, *best_decoder = NULL;
@ -2978,9 +2978,16 @@ int av_find_best_stream(AVFormatContext *ic,
continue;
}
}
if (best_count >= st->codec_info_nb_frames)
count = st->codec_info_nb_frames;
bitrate = avctx->bit_rate;
multiframe = FFMIN(5, count);
if ((best_multiframe > multiframe) ||
(best_multiframe == multiframe && best_bitrate > bitrate) ||
(best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
continue;
best_count = st->codec_info_nb_frames;
best_count = count;
best_bitrate = bitrate;
best_multiframe = multiframe;
ret = real_stream_index;
best_decoder = decoder;
if (program && i == nb_streams - 1 && ret < 0) {