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Bug fix for libav MPEG4 video frame rate encoding.

This commit is contained in:
mjbudd77 2021-09-16 23:40:29 -04:00
parent b514c143b6
commit 1dd9036da6
1 changed files with 13 additions and 2 deletions
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15
src/drivers/Qt/AviRecord.cpp
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@ -821,9 +821,12 @@ static int initVideoStream( enum AVCodecID codec_id, OutputStream *ost )
AVCodecContext *c;
double fps;
int fps1000;
unsigned int usec;
fps = getBaseFrameRate();
usec = (unsigned int)((1.0e6 / fps)+0.50);
fps1000 = (int)(fps * 1000.0);
/* find the video encoder */
@ -866,8 +869,16 @@ static int initVideoStream( enum AVCodecID codec_id, OutputStream *ost )
* timebase should be 1/framerate and timestamp increments should be
* identical to 1. */
//ost->st->time_base = (AVRational){ 1000, fps1000 };
ost->st->time_base.num = 1000;
ost->st->time_base.den = fps1000;
if ( codec_id == AV_CODEC_ID_MPEG4 )
{ // MPEG4 max num/den is 65535 each
ost->st->time_base.num = 1000;
ost->st->time_base.den = fps1000;
}
else
{
ost->st->time_base.num = usec;
ost->st->time_base.den = 1000000u;
}
c->time_base = ost->st->time_base;
c->gop_size = 12; /* emit one intra frame every twelve frames at most */
c->pix_fmt = AV_PIX_FMT_YUV420P;