[FFmpeg-devel] Merge from ffmpeg 1.1.3 to 2.1.2 port for CE

[Hermann, Sven (SCR US)]

Hi,

I inherited a project where we have ported a ffmpeg version to Windows CE.
It is built in Cygwin with MinGW in a quite big process. But that just as background.

I recently tried to port the new version (2.1.2) to this build process, and have since massive problems with my application.

The Application is a Video Stream Player for IP Cameras. This means, I don't have to deal with encoding frames or such. My Stream (H264 and MPEG4) is tunneled through live555 and I get a callback with the frame available. Now this frame is sent to ffmpeg to decode.

With ffmpeg 1.1.3, this worked just fine, and since I ported 2.1.2, I get an crash in a call to avcodec_decode_video2(). I tried to trace this further down. But since I am cross compiling with a terrible Cygwin and Visual Studio setup this is rather painful. However, I could trace it all the way down to decode_nal_units() in h264.c (I am debugging the H264 decoder first).

On this level I cannot really tell anymore what is going on since I debug ffmpeg with printf() insertions (I know, terrible... but I have no way to actually debug ffmpeg on my ce device).
I enabled all the traces for this level, and get the following:

[h264 @ 0xaa320] Unknown NAL code: 0 (0 bits)
[h264 @ 0xaa320] Unknown NAL code: 0 (1934 bits)
[h264 @ 0xaa320] non-existing PPS 127 referenced
[h264 @ 0xaa320] decode_slice_header error
[h264 @ 0xaa320] non-existing PPS 159 referenced
[h264 @ 0xaa320] decode_slice_header error
[h264 @ 0xaa320] Unknown NAL code: 29 (1390 bits)
[h264 @ 0xaa320] non-existing PPS 7 referenced
[h264 @ 0xaa320] decode_slice_header error
[h264 @ 0xaa320] Unknown NAL code: 0 (234 bits)
[h264 @ 0xaa320] Unknown NAL code: 0 (106 bits)
[h264 @ 0xaa320] Unknown NAL code: 0 (74 bits)
[h264 @ 0xaa320] Unknown NAL code: 0 (0 bits)
[h264 @ 0xaa320] Unknown NAL code: 0 (12 bits)
.
.
.
[h264 @ 0xaa320] Unknown NAL code: 0 (0 bits)
[h264 @ 0xaa320] Unknown NAL code: 0 (0 bits)
Unhandled exception at 0x422171c3 in PanelMediaPlayer.exe: 0xC0000005: Access violation.


I looked at the example of how to decode, and seem to do it the right way. Any Idea what I might do wrong? Any help is appreciated. I spent days debugging this issue now, and don't get any further.

Thanks

Sven


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