UMC_ERR_SYNC at MPEG Decoder

vardar — Tue, 28 Dec 2010 06:54:37 GMT

Hello all,

I am getting UMC_ERR_SYNC (-897) from MPEG4Decoder's GetFrame method.

But this is not occurring for normal streams.

I get this error only if stream size is very big.

I mean if there is low light conditions and a lot of noise in the stream.

Also same stream is playable with other decoders.

Any idea will be appreciated.

Many thanks,

victor

UMC_ERR_SYNC at MPEG Decoder

Naveen_G_Intel — Tue, 28 Dec 2010 11:33:43 GMT

Hi Victor,

I dont think error is because of size. Probably because of noise, its not able to find GOV, VOP start code. You can take care of such issue in your application itself, ignore the data.

Also, how you are initializing Frame Constructor?

Regards,

Naveen Gv

UMC_ERR_SYNC at MPEG Decoder

vardar — Tue, 28 Dec 2010 11:52:14 GMT

Hello Naveen,

many thanks for your prompt reply.

Actually I don't initialize frameconstructordirectly.

My decoder initialization is as follows;

auto_ptr< MPEG4VideoDecoder > mpeg4Decoder ( new MPEG4VideoDecoder() );

auto_ptr< VideoDecoderParams > params ( new VideoDecoderParams() );

auto_ptr< VideoProcessing > color ( new VideoProcessing() );

auto_ptr< BaseCodec > pPointerCopier ( new DataPointersCopy() );

auto_ptr< MediaData > in ( new MediaData() );

auto_ptr< VideoData > out ( new VideoData() );

auto_ptr< ThreadedDemuxer > splitter ( new ThreadedDemuxer() );

if(!mpeg4Decoder.get() || !params.get() || !in.get() ||

!out.get() || !splitter.get() || !color.get() || !pPointerCopier.get())

{

vm_string_printf(__VM_STRING("Allocation failed-%d\n"), nth);

errorFound = true;

break;

}

// initialize the splitter

SplitterParams splParams;

splParams.m_lFlags = VIDEO_SPLITTER;

splParams.m_pDataReader = pRdr;

if( UMC_OK != splitter->Init(splParams)) //Status ThreadedDemuxer::Init(SplitterParams& init)

{

errorFound = true;

break;

}

bool bInitialize = false;

Ipp16u nSequentialDecodeError = 0; // sequential error counter

if (3 > in->GetDataSize())

{

Status statusHelper;

while(true)

{

statusHelper = splitter->GetNextData(in.get(), (Ipp32u)0);

if (statusHelper == UMC_OK) {

innerWhileStatusOK = true;

break;

}

if (!innerWhileStatusOK) {

break;

}

if(!bInitialize)

{

bInitialize = true;

if (color.get())

{

VideoProcessingParams postProcessingParams;

postProcessingParams.m_DeinterlacingMethod = NO_DEINTERLACING;

postProcessingParams.InterpolationMethod = 0;

color->SetParams(&postProcessingParams);

}

if (color.get())

params->pPostProcessing = color.get();

else

params->pPostProcessing = pPointerCopier.get();

params->info.stream_type = MPEG4_VIDEO;

params->numThreads = 0;

params->lFlags = 0;

params->m_pData = in.get();

if (UMC_OK != (mpeg4Decoder->Init(params.get())))

{

vm_string_printf(__VM_STRING("Video Decoder creation failed-%d\n"), nth);

errorFound = true;

break;

}

VideoDecoderParams params;

if (UMC_OK != mpeg4Decoder->GetInfo(&params))

{

vm_string_printf(__VM_STRING("Video Decoder creation failed-%d\n"),nth);

errorFound = true;

break;

}

out->SetAlignment(16);

out->Init(params.info.clip_info.width, params.info.clip_info.height, UMC::YUV422, 8);

out->Alloc();

//after some more internal code I'm using like

Status ret = mpeg4Decoder->GetFrame(in.get(), out.get());

topic UMC_ERR_SYNC at MPEG Decoder in Intel® Integrated Performance Primitives

UMC_ERR_SYNC at MPEG Decoder

UMC_ERR_SYNC at MPEG Decoder

UMC_ERR_SYNC at MPEG Decoder