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

[Michael Niedermayer]

On Tue, Jan 28, 2014 at 09:19:26PM +0000, Hermann, Sven (SCR US) wrote:
> 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.

a very wild guess, your allocated input buffer is
FF_INPUT_BUFFER_PADDING_SIZE bigger than the size set in AVPacket ?
also i assume you tried with asm and multithreading disabled ?
if not please try and reporrt back if that makes a difference
and as you mention windows, i assume you enable CONFIG_MEMALIGN_HACK
or somehow else ensured malloc() returns well aligned memory

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Old school: Use the lowest level language in which you can solve the problem
            conveniently.
New school: Use the highest level language in which the latest supercomputer
            can solve the problem without the user falling asleep waiting.
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