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#1 Posted : Sunday, January 14, 2007 9:12:25 PM(UTC)

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I have tested my source filter with LEADTOOLS h.264 decode filter, got 2 strange results.

1st - I supposed that the decoding process runs at maximum frame-rate if source filter delivers non-timestamped h.264 samples without delay to LEADTOOLS decode filter whenever it is asked. But I was wrong, it runs at fixed frame-rate(about 15fps) with low CPU utilization. It means that there's default frame-rate control on non-timestamped samples, I want to know whether it is done by LEADTOOLS deocde filter or not.

2nd - If source filter delivers timestamped h.264 samples with purposeful delay which is much more than timestamp increasing, there's no video output, although entire decoding process is still running. It means that there's also default frame-drops control on timestamped-samples, I also want to know whether it is done also by LEADTOOLS decode filter too or not.




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#2 Posted : Monday, January 15, 2007 5:27:27 AM(UTC)

Qasem Lubani  

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The decoding speed is not limited by any factor
inside the decoder itself. This means if compressed frames are delivered to the decoder, it immediately decodes them regardless of the frame rate.

Other parts of the filter graph are responsible for
delivery rate. For example, when the decoder is part of a conversion graph, the
graph is usually run at full speed (which depends on factors such as the
hardware capabilities and video size). This might be faster or slower than playback speed.

On the other hand, when it's a playback graph, its has
to be the exact playback speed, which could result in added delays if the hardware is too fast, or dropped frames if it's too slow.
#3 Posted : Monday, January 15, 2007 3:01:55 PM(UTC)

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In fact I also guess Video Renderer filter is behind these results, and your precise reply give me sureness.


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