Re: mpeg2 demux output pin buffer size

On Tue, 16 Sep 2008 23:46:39 -0700 (PDT), dev <krt.dev@xxxxxxxxx>
wrote:

1.Buffering input media samples data into temporary buffer and
returning S_FALSE from transofrm for such media samples.Is this
approach right for buffering?

If you're going to stick with a filter derived from CTransformFilter,
then probably you probably want to override Receive to handle the
allocation of output samples only as needed.

2. When the video filter has so much data to be buffered would not the
audio/video sync go for a toss ? Can I control this in any way?

Sync should be ok. The issue is that you need to read more of the file
before you get the first frame output and so I suppose you think that
audio will have already started.

In fact, the cueing mechanism allows for this. The graph enters pause
mode and data flows through the decoders. It does not complete the
transition to Run until all renderers have received data. The increase
in buffering will increase the time for the pause to complete, and so
might slow down startup of the video very slightly, but the video and
audio will both start at the same time.

3. Do I have to handle timestamping manually for this?

I don't see any reason why you should. You just need to ensure that
the input timestamps you receive from the demux are retained with the
frame so they can be correctly attached to the outgoing buffer that
corresponds.

G
.

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