Error status 0x00000402 when doing decoding with mpeg2 decoder

zhao sun

Expert 1170 points

Hi expert,

I have difficulties in integrating mpeg2 decoder in my framework. The lib version is 02.02.00.02. And the platform

used here is c6678. I run it on the corepac0. When I run the TestAppDecoder (unit test program), it can work well. But

after I integrate in my application and run. The process function return error.

retVal = ividDecFxns->process((IVIDDEC2_Handle)handle, &inputBufDesc2, &outputBufDesc, dec_inargs, dec_outargs);

retVal is -1.

So I run

ividDecFxns->control(handle, XDM_GETSTATUS, dec_dynpar, dec_status);

to get error status, And the

dec_status->extendedError = 0x00000402

So I refer to the datasheet, and find that bit 10 means "XDM_INSUFFICIENTDATA"

And "2" means : MPEG2VDEC_ERROR_bitstream_Overrun

It seems that I have feed insufficient data to the codec. But I can ensure that I have feed enough data to

codec already. The dec_inargs->numBytes = 0x4000, the same value can work well in the unit test (TestAppDecoder) program. And also I can make sure that the input data has all be put into the inputbuffer.

So can you help me check this issue? What is the possible reason cause the error?

Thanks a lot!

B.R.

Sunzhao

over 11 years ago

0 Paula Carrillo over 11 years ago

TI__Mastermind 38820 points

Sunzhao, could you update to latest Mpeg2 decoder 2.2.1.8 (http://software-dl.ti.com/dsps/dsps_public_sw/codecs/C6678/MPEG2_D/latest/index_FDS.html) and let us know if you still face any issues?

thank you,

Paula

0 zhao sun over 11 years ago in reply to Paula Carrillo

Expert 1170 points

Paula,

Thank you very much for the reply. I have resolve this issue. It is because that my input buffer is too small to

feed enough data to the decoder.

By the way, Will you please tell me if the mpeg2 decoder support error recovery? If the bitstream feed to the decoder is not a standard bitstram. i.e. The decoding order is IBBPBBPBBP...... The first 2 B frames need reference frames before I frame. But we have lost the reference frame. Which will get an 0x40b error from the decoder. And then the decoding process is break down. So how can I walk around this issue and go on decoding?

Thank you very much!

Sunzhao

0 Paula Carrillo over 11 years ago in reply to zhao sun

TI__Mastermind 38820 points

Hi Sunzhao, My understanding is that you need to discard frames which has not all its reference frames. But I will check with the codec team which type of error concealment we support for open GOP.

Thank you,

Paula

0 Paula Carrillo over 11 years ago in reply to Paula Carrillo

TI__Mastermind 38820 points

Sunzhao, I got confirmation that the application needs to discard the first two B frames. Also "MPEG2VDEC_ERROR_brokenLinkSet" is non fatal error, so application can continue decoding.

For open GOP decoding, currently MPEG2 decoder will skip decoding and return with MPEG2VDEC_ERROR_brokenLinkSet error code.

Please let us know if you have further questions,

Paula

0 Paula Carrillo over 11 years ago in reply to Paula Carrillo

TI__Mastermind 38820 points

Hi Sunzhao, I hope you could overcome the broken link error. I will close this thread but please feel free to open it (or a new one) if you need further assistance.

thank you,

Paula

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Error status 0x00000402 when doing decoding with mpeg2 decoder