ipp-samples 7.0.6 H264 decoder UMC_ERR_NOT_ENOUGH_DATA error code

[Yaroslav_Korchevsky]

I switched from old IPP 5 with coresponding IPP-samples to 7.0.6 IPP + ipp-samples

It appeeared, that MP4 decoder works fine, but H264 decoder became non working.
It always returns UMC_ERR_NOT_ENOUGH_DATA

I feed the data to decoder by frames.
As many frames I feed to decoder as many UMC_ERR_NOT_ENOUGH_DATA error codes I get in response.

I invoke both MP4 and H264 decoders same way.


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if (!m_isDecoderInit)
{
createVideoDecoder();

m_videoDecParams.info.stream_type = m_inputStreamType;
m_videoDecParams.info = m_videoInfo;
m_videoDecParams.info.clip_info = m_videoInfo.clip_info;
m_videoDecParams.lFlags = UMC::FLAG_VDEC_REORDER;

if(m_inputStreamType == UMC::MPEG4_VIDEO || m_inputStreamType == UMC::MPEG2_VIDEO)
{
m_videoDecParams.lFlags = 0;
}

if(m_inputStreamType == UMC::H264_VIDEO)
{
m_videoDecParams.numThreads = 1;
m_videoDecParams.lFlags = 0;
}

m_videoDecParams.pPostProcessing = m_videoProcessing.get();
m_videoDecParams.m_pData = m_pInMediaData;
UMC::Status umcRes = m_videoDecoder->Init(&m_videoDecParams);

if (umcRes != UMC::UMC_OK ) return ;
m_isDecoderInit = true;
}

UMC::Status umcRes = m_videoDecoder->GetFrame(m_pInMediaData, m_pOutVideoData);

return umcRes ;
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m_pInMediaData - is definitely filled.
Videostream is definitely valid as far as other H.264 decoders works correctly.

What could be wrong with IPP decoder?

[Yaroslav_Korchevsky]

To be precise I attach my videostream split by frames

[alex78]

Hi,

nothing is wrong. When you receive this kind of error, just call GetFrame once more with NULL to force the decoder to output the frame immediately. Something like:

result = coredecoder->GetFrame(&datain, &dataout);

if (result == UMC_ERR_NOT_ENOUGH_DATA) {
result = coredecoder->GetFrame(NULL, &dataout);
}

Hope this helps.

Alex

[Yaroslav_Korchevsky]

Alex78. Thank you.

It really works, but I don't imagine why.
why it doesn't work if I feed next frame?
Looks, like this feature is bug.

Can you explane me the idea?
I know, that depending on the stream profile it may be coded the
input to output frame delay 0 to several frames.
According to this idea output should appear ith some delay.
However, error code UMC_ERR_NOT_ENOUGH_DATA keeps the same always.
regardless the number of input frames I fed.

I keep thinking, it is bug, which has workaround.

Is it so?

[selea]

I found exactly the same thing. Sometime in H264 stream I foundUMC_ERR_NOT_ENOUGH_DATA after GetFrame. If I call GetFrame(NULL,...) I often get the frame decoded from the GetFrameInternal of the H264Decoder.

I think this behaviour happens because sometime during play of H264 stream (especially in RTP streams) I submit to the GetFrame a frame where there's only SPS or PPS...this cause theUMC_ERR_NOT_ENOUGH_DATA. Anyway sometime this happen even with a P image.

I'm asking if this happen for the B frame that the H264Decode have to support

[alex78]

Hi,

well, I do not see the logic either. I think that even if the decoder accumulates frames inside, it should (after some frames have been fed into it) start to return the decoded frames. So I treat it as a "design principle" of the decoder and I am just calling GetFrame with NULL to get the decoded frames :). AFAIK this does not happen for other UMC based decoders than H264.

Alex

[Yaroslav_Korchevsky]

In IPP H264 decoder version 5.x it did work correctly.
If I feed complete frame, decoder returns decoded frame.
When I feed only part of frame, or just SPS (and PPS)
decoder waits the rest of frame and returns UMC_ERR_NOT_ENOUGH_DATA.

In this version I confused by behavour change: I feed complete frame, but decoder reports that input data is insufficient :(

[selea]

I think there's something changed in the lib version 7.0.7.

I found someCompleteDecodedFrames(0); function calls when happen UMC_ERR_NOT_ENOUGH_DATA

I don't know if this is used to make it a better behaviour

[Yaroslav_Korchevsky]

In 7.0.7 - the same as in 7.0.6