Re: [Mlt-devel] playback sync to clock

[Dan D. <da...@de...>]

On Tue, Aug 23, 2011 at 9:56 AM, Carl Karsten <ca...@pe...> wrote:
> when playing a video, if the stream has time stamps in the frames
> (like a dv stream) but there are missing frames (buffer underrun...),
> can the player dupe the last known frame to fill in the gap and keep
> the time stamp synced with the local OS clock?

no. Keep in mind the only way to get DV into mlt is through file or
pipe, and I think libavformat does not pay any attention to the
timecode in the DV stream - would need to check that.

> The goal is to put 2 cams on 2 different tall buildings, stream live,
> and make a 3d player described in
> http://xkcd.com/941/ "Depth Perception"   But the streaming over
> random internets will likely cause issues, so need to figure out how
> to sync the 2.    and no, I don't intend on streaming DV, that is just
> the one format I know for sure has a timestamp on every frame.

Most streams - certainly anything going over a network - have
timestamping. RTP and TS timestamps are conveyed through libavformat,
and there is dropping and repeating in the mlt avformat producer to
stay on track. I do not claim it is bug-free for this particular use
case, however.

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