[Libav-user] latency of mpegts handling in libavformat

Alex Cohn alexcohn at netvision.net.il
Wed Jul 27 10:09:10 CEST 2011

On Wed, Jul 27, 2011 at 10:27, כרמל מגן <carmel.work at gmail.com> wrote:

> av_read_frame does not return until the third frame arrives. This
> introduces 2 frames delay *before* the decoding.

What do you mean "av_read_frame does not return"?

from avformat.h:
 * This function returns what is stored in the file, and does not validate
 * that what is there are valid frames for the decoder. It will split what
 * @return 0 if OK, < 0 on error or end of file

So, does it return negative number? Or the packet is not a video packet?
Maybe, you have the first video packet spliced into three network packets?
Note that the first video frame is large (it is a key frame, naturally). The
subsequent packet are much much smaller, becasue they encode only delta.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ffmpeg.org/pipermail/libav-user/attachments/20110727/17e3f58a/attachment.html>

More information about the Libav-user mailing list