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lavf: consider codec framerate for framerate detection

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Fixes detection of some TV sample as 24.5 FPS. With the patch applied,
it's detected as 25 FPS.

This is enabled for mpegts only.
This commit is contained in:
wm4 2017-05-23 13:36:38 +02:00
parent 34c5200560
commit 66cf78e932
3 changed files with 17 additions and 0 deletions
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5
libavformat/internal.h
View File

@ -145,6 +145,11 @@ struct AVFormatInternal {
* ID3v2 tag useful for MP3 demuxing
*/
AVDictionary *id3v2_meta;
/*
* Prefer the codec framerate for avg_frame_rate computation.
*/
int prefer_codec_framerate;
};
struct AVStreamInternal {

2
libavformat/mpegts.c
View File

@ -2616,6 +2616,8 @@ static int mpegts_read_header(AVFormatContext *s)
int len;
int64_t pos, probesize = s->probesize;
s->internal->prefer_codec_framerate = 1;
if (ffio_ensure_seekback(pb, probesize) < 0)
av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");

10
libavformat/utils.c
View File

@ -3904,6 +3904,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
st->info->codec_info_duration) {
int best_fps = 0;
double best_error = 0.01;
AVRational codec_frame_rate = avctx->framerate;
if (st->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
st->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
@ -3924,6 +3925,15 @@ FF_ENABLE_DEPRECATION_WARNINGS
best_error = error;
best_fps = std_fps.num;
}
if (ic->internal->prefer_codec_framerate && codec_frame_rate.num > 0 && codec_frame_rate.den > 0) {
error = fabs(av_q2d(codec_frame_rate) /
av_q2d(std_fps) - 1);
if (error < best_error) {
best_error = error;
best_fps = std_fps.num;
}
}
}
if (best_fps)
av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,