As I understand and use it, to calculate the pts you need to take the
time base of the stream into account. For example, my application uses a
native time base that is in microseconds (thus if you have a frame rate
of 15, the timestamp of each frame is increased by 1000000/15 = (about)
66667). This can be calculated to the stream's time_base with the
av_rescale_q function, in the following manner:
pkt.pts = av_rescale_q(packet->timestamp().microseconds(),
(AVRational){1,1000000}, stream_context->time_base);
The first argument is the timestamp of the frame in microseconds, the
second is the microsecond time_base and the third argument is the
streams time_base. So this functions transfers a value from one time
base to another.
I hope this helps (and that it is correct, it seems to work for me :))!
Cheers,
Mart
On 09/08/2011 03:09 AM, psychesnet wrote:
Hello Amir,
My source H264 and AAC are raw data, I try to packet it into mpegts by
ffmpeg, but my issue is how to sync video and audio. In my research, I can
use pts to sync video and audio, but I do not calculate the pts value on raw
data resource. On the Internet, there are a lot of sample code about how to
packet H264+AAC to mpegts, but the pts value is copied from original input
file, no calculate function to do.
So, my issue is how to calculate the pts under mpegts container.
Thanks a lot.
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Mart van de Sanden | yellowBird
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