topic h264Decoder not decoding last frame in video stream in Intel® Integrated Performance Primitives

h264Decoder not decoding last frame in video stream

sschaem — Fri, 23 Apr 2010 22:01:21 GMT

Here is my finding:

- The h264 Decoder says its running out of source data a few frames before the end of the files.

Calling

umcRes = m_umc.decoder->GetFrame(m_umc.mediaData, m_umc.videoData);

returnsUMC::UMC_ERR_NOT_ENOUGH_DATA

and

umcRes = m_umc.splitter->GetNextData(m_umc.mediaData, m_umc.nVideoTrack);

returns

UMC::UMC_ERR_END_OF_STREAM

So there is no more data to give to the decoder.

In my test case a file with 2247 frames get 2244 frames decode and then return the above.

But if I loop the file, by calling this when reachingUMC::UMC_ERR_END_OF_STREAM

m_umc.splitter->SetTimePosition(0);

// m_umc.decoder->Reset() // Dont reset the decoder to see what happen

The decoder returns the missing frames!

Conclusion: It seem that decoder want more data then it needs to decode the last frames in a file.

I suggest that the UMC team devise a test that decode only the last frame of a file.

1) Seek to the last frame start time

2) From the actual position (iframe) , decode N frame to reach the last frame

It cannot be done with the h264 decoder...

Thanks for looking in to this,

Stephan

PaulF_IntelCorp — Fri, 23 Apr 2010 23:18:31 GMT

Hello Stephan,

I've seen something like this reported before, looking for some threads that are related. Found this one, not sure if it helps.

Will provide more feedback as I find it.

Paul

sschaem — Sun, 25 Apr 2010 02:00:06 GMT

Thanks,

I seen this thread but its not related since I can seek correctly.

(Beside reset() crashing the decoder when its initialed to use >1 thread , see my other post)

I will try with another decoder (mpeg2) ... and report on monday

Stephan