[Ffmpeg-devel] Timestamps on Decoding

[Rich Felker]

On Sun, Oct 23, 2005 at 09:02:37PM -0400, Ronald S. Bultje wrote:
> On Sun, 2005-10-23 at 18:45 -0400, Paul Curtis wrote:
> > But the last question was never answered: when I receive a complete raw 
> > frame, how can I accurately tell what it is I have received? Queueing 
> > the frames (audio or video) and presenting them to the Helix encoder 
> > wouldn't be a problem IF I could determine when the frame SHOULD be 
> > presented. This is the crux of the problem, and even Richard has said 
> > it's a problem.
> 
> Depends on how you call av_decode_video(). I call it in a loop, like
> this (quasi-code):
> 
> for (;;) {
>   if (output = av_decode_video (ctx, input)) {
>     // do something with output
>   }
> }
> 
> 1) if it's an I frame, then output == input, roughly. Timestamps, all

Nope. You only have output == input for B frames. I and P frames will
always be delayed (if has_b_frames is true). (Work out the logic if
this isn't clear already..)

Rich