[Libav-user] H264 1 frame delay.

[Alex Cohn]

On Sun, Nov 13, 2011 at 23:50, Victor Moray <victor.moray at gmail.com> wrote:
> Hi everyone!
> This is my first post. I'm using FFMPEG through VLC to receive and decode
> H264 video from a hardware video encoder over RTSP on a local network. The
> hardware encoder manufacturer provides an ActiveX control which is used to
> receive and decode video from the encoder, and the latency is minimal.
> However, through FFMPEG there is always a 1 frame delay between what the
> manufacturer-provided control shows, and what VLC shows. The effects of the
> frame delay are more prevalent when video is being streamed at low frame
> rates. (e.g. at 3 fps, the delay is 333.3 ms).
> I have completed extensive investigations with VLC and have reduced all
> relevant buffers to zero. My attention now turns to FFMPEG. I was wondering
> if anyone could tell me whether there exists whole frame buffers which can
> be configured in the source code.
> Any help or direction would be greatly appreciated,
> Vic.

See
https://groups.google.com/group/xuggler-users/browse_thread/thread/e0f0b6f474c7c41f?pli=1
or http://x264dev.multimedia.cx/archives/249 (executive summary: the
relevant features of x264 are not exported through ffmpeg, you need a
patch).