Use of StreamDecoder

[Bernard Maassen]

HI Support,

We're running into a problem decoding h264 frames from a certain camera.

I've captured the raw rtp data stream and VideoConverter can transcode it.
However when i tried to test it with the StreamDecoder it crashed.

The command used:
StreamDecoder.exe --input frames.1383743011871.dat --streamtype H264 --output output
Input file: frames.1383743011871.dat
YUV output file: output
Open Transcoder: Success
--- crash ---

Did i use the sample program incorrect?

Bernard

[Svilen Stoilov]

Hi Bernard,

 

we checked your sample file with the StreamDecoder and it actually worked. We used the latest released version 1.6.1 (Windows x86 Demo) with the same command line as yours.

 

 

Can you confirm that it still crashes with you?

Does it crash in

res = transcoder->run(); // StreamDecoder.cpp line:127

or in the following line:

printError(L"Run Transcoder", transcoder->error()); // StreamDecoder.cpp line:128

 

Are you using AVBlocks 1.6.1 or something else?

 

Thanks,

Svilen

[Bernard Maassen]

Hi Svilen,

For me it still crashes,
I've run it as debug and got the following:

Unhandled exception at 0x7697DEE1 (KernelBase.dll) in StreamDecoder.exe: 0xC0000005: Access violation writing location 0x00000000.

with the following stack:
     KernelBase.dll!7697dee1()    Unknown
     [Frames below may be incorrect and/or missing, no symbols loaded for KernelBase.dll]   
     kernel32.dll!757b12cc()    Unknown
>    StreamDecoder.exe!FileStream::write(const void * buffer, int dataSize) Line 166    C++
     AVBlocks.dll!0fd542c1()    Unknown
     AVBlocks.dll!0fd5440d()    Unknown
     AVBlocks.dll!0fd5a2b8()    Unknown
     AVBlocks.dll!0fd5a4f8()    Unknown
     AVBlocks.dll!0fd5a4f8()    Unknown
     AVBlocks.dll!0fd5c431()    Unknown
     AVBlocks.dll!0fd5c7d4()    Unknown
     msvcr110d.dll!_unlock(int locknum) Line 366    C
     msvcr110d.dll!_unlock_file(_iobuf * pf) Line 300    C

[Bernard Maassen]

Forgot to tell:

yes i'm using the demo 1.6.1 for windows

[Bernard Maassen]

As its decoding for you,
could you check if it actually decodes usable images?

What we see is that the decoder decodes the frames, but that the produced images are incorrect.

Key frames are decoded correctly,

but all non key frames seem to have no relation to decoded key frame resulting in:

We only see the changes.

If we send the exact same byte data into a different decoder it decodes without any problem.

Might be usefull to know that the stream contains interlaced frames

Kind regards / Met vriendelijke groet,

Bernard Maassen

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[Svilen Stoilov]

This looks like an error in the StreamDecoder sample.

In FileStream.h line:166:

 

return TRUE == WriteFile(m_hFile, buffer, dataSize, NULL, NULL);

 

It should be like this

 

DWORD bytesWritten;

return TRUE == WriteFile(m_hFile, buffer, dataSize, &bytesWritten, NULL);

 

So the call to WriteFIle is not correct but it seems that it doesn't crash on all Windows versions.

What is your Windows version?

 

I believe the above should fix the crash.

 

Thanks,

Svilen

[Bernard Maassen]

HI Svilen,

the change doesn't compile as bytesWritten isn't known

I'm running on windows 7 64 bit

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[Svilen Stoilov]

It should. I'm attaching the modified FileStream.h form the StreamDecoder sample

 

Changed lines: 166,167

[Valentin Kantchev]

See if this works for you: http://www.yuvtoolkit.com/

[Svilen Stoilov]

Bernard, I sent you an archive of our decoded output to your corporate email to see that it looks OK.

 

About yuv player we have used this one: http://yuvplayer.com/

It automatically detects the frame size if it is part of the filename: e.g. output_640x480.yuv

It kind of works. It has a free license.

But I've noticed that it doesn't play correctly the required frame rate. I cannot remember if it was quicker or slower than required but it was not correct.

 

Another usable raw player is Vooya: http://www.offminor.de/

 

Regards,

Svilen

On Thursday, November 7, 2013 6:12:03 PM UTC+2, Bernard Maassen wrote:

Hi Svilen,

This indeed worked.

Do you know any program that could play the uncompressed video output file?

Or do i need to write it my self?

Kind regards / Met vriendelijke groet,

Bernard Maassen
Chief Technology Officer & Lead Java developer