I'm trying to extract a frame from an M4V file using code based on Martin Bohme's tutorial. The main loops reads a bunch of packets from the appropriate stream, but suddenly crashes with the following (strange-looking) stack trace: apFile.dll!_ac3_common_init() + 0x28433 apFile.dll!_ac3_common_init() + 0x295b0 apFile.dll!_ac3_common_init() + 0x31dbd apFile.dll!_ac3_common_init() + 0x33b63 apFile.dll!_ac3_common_init() + 0x345b0 apFile.dll!_avcodec_decode_video() + 0xf2 I am linking the MingW32-build libav* libraries to my C++ application, built with MSVC7.1. I am using the latest CVS snapshot since the server is down. The file in question has the following streams: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'myfile.m4v': Duration: 00:02:30.2, start: 0.000000, bitrate: 672 kb/s Stream #0.0(eng): Audio: mp4a / 0x6134706D, 44100 Hz, stereo Stream #0.1(eng), 23.98 fps(r): Video: h264, yuv420p, 320x132 FFMpeg seems to be able to read and convert the file without a problem. Can anyone tell me why this is crashing? Thanks in advance, Matt
Matthew Gertner wrote:
I'm trying to extract a frame from an M4V file using code based on Martin Bohme's tutorial. The main loops reads a bunch of packets from the appropriate stream, but suddenly crashes with the following (strange-looking) stack trace:
apFile.dll!_ac3_common_init() + 0x28433 apFile.dll!_ac3_common_init() + 0x295b0 apFile.dll!_ac3_common_init() + 0x31dbd apFile.dll!_ac3_common_init() + 0x33b63 apFile.dll!_ac3_common_init() + 0x345b0 apFile.dll!_avcodec_decode_video() + 0xf2 I am linking the MingW32-build libav* libraries to my C++ application, built with MSVC7.1. I am using the latest CVS snapshot since the server is down.
The file in question has the following streams:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'myfile.m4v': Duration: 00:02:30.2, start: 0.000000, bitrate: 672 kb/s Stream #0.0(eng): Audio: mp4a / 0x6134706D, 44100 Hz, stereo Stream #0.1(eng), 23.98 fps(r): Video: h264, yuv420p, 320x132
FFMpeg seems to be able to read and convert the file without a problem.
More info. I just noticed that my console contains the following messages during decoding: [h264 @ 03B81AB8]left block unavailable for requested intra mode at 14 4 [h264 @ 03B81AB8]error while decoding MB 14 4 [h264 @ 03B81AB8]top block unavailable for requested intra mode at 2 0 [h264 @ 03B81AB8]error while decoding MB 2 0 [h264 @ 03B81AB8]left block unavailable for requested intra4x4 mode -1 at 12 4 [h264 @ 03B81AB8]error while decoding MB 12 4 [h264 @ 03B81AB8]top block unavailable for requested intra mode at 2 0 [h264 @ 03B81AB8]error while decoding MB 2 0 [h264 @ 03B81AB8]left block unavailable for requested intra4x4 mode -1 at 12 4 [h264 @ 03B81AB8]error while decoding MB 12 4 [h264 @ 03B81AB8]negative number of zero coeffs at 7 0 [h264 @ 03B81AB8]error while decoding MB 7 0 [h264 @ 03B81AB8]left block unavailable for requested intra4x4 mode -1 at 12 4 [h264 @ 03B81AB8]error while decoding MB 12 4 [h264 @ 03B81AB8]top block unavailable for requested intra mode at 3 0 [h264 @ 03B81AB8]error while decoding MB 3 0 [h264 @ 03B81AB8]top block unavailable for requested intra4x4 mode -1 at 19 4 [h264 @ 03B81AB8]error while decoding MB 19 4 [h264 @ 03B81AB8]left block unavailable for requested intra mode at 8 1 [h264 @ 03B81AB8]error while decoding MB 8 1 [h264 @ 03B81AB8]left block unavailable for requested intra4x4 mode -1 at 12 4 [h264 @ 03B81AB8]error while decoding MB 12 4 [h264 @ 03B81AB8]left block unavailable for requested intra mode at 5 0 [h264 @ 03B81AB8]error while decoding MB 5 0 [h264 @ 03B81AB8]left block unavailable for requested intra4x4 mode -1 at 12 4 [h264 @ 03B81AB8]error while decoding MB 12 4 [h264 @ 03B81AB8]dquant out of range (-1832) at 4 0 [h264 @ 03B81AB8]error while decoding MB 4 0 [h264 @ 03B81AB8]top block unavailable for requested intra mode at 18 4 [h264 @ 03B81AB8]error while decoding MB 18 4 [h264 @ 03B81AB8]P sub_mb_type 4 out of range at 6 2 [h264 @ 03B81AB8]error while decoding MB 6 2 [h264 @ 03B81AB8]P sub_mb_type 26 out of range at 0 5 [h264 @ 03B81AB8]error while decoding MB 0 5 [h264 @ 03B81AB8]P sub_mb_type 4 out of range at 13 0 [h264 @ 03B81AB8]error while decoding MB 13 0 [h264 @ 03B81AB8]top block unavailable for requested intra4x4 mode -1 at 14 5 [h264 @ 03B81AB8]error while decoding MB 14 5 [h264 @ 03B81AB8]top block unavailable for requested intra mode at 0 3 [h264 @ 03B81AB8]error while decoding MB 0 3 [h264 @ 03B81AB8]negative number of zero coeffs at 14 4 [h264 @ 03B81AB8]error while decoding MB 14 4 [h264 @ 03B81AB8]top block unavailable for requested intra4x4 mode -1 at 7 0 [h264 @ 03B81AB8]error while decoding MB 7 0 [h264 @ 03B81AB8]top block unavailable for requested intra mode at 14 5 [h264 @ 03B81AB8]error while decoding MB 14 5 [h264 @ 03B81AB8]P sub_mb_type 28 out of range at 14 1 [h264 @ 03B81AB8]error while decoding MB 14 1 ...and so on... Should I be posting this to ffmeg-devel instead? Matt
Hi Matthew Gertner wrote:
Matthew Gertner wrote: [...]
Should I be posting this to ffmeg-devel instead?
Matt
Can you upload a sample somewhere ? -- Baptiste COUDURIER GnuPG Key Id: 0x5C1ABAAA SMARTJOG S.A. http://www.smartjog.com Key fingerprint 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA Phone: +33 1 49966312
Baptiste COUDURIER wrote:
Hi
Matthew Gertner wrote:
Matthew Gertner wrote: [...]
Should I be posting this to ffmeg-devel instead?
Matt
Can you upload a sample somewhere ?
http://www.allpeers.com/blog/downloads/da_vinci_code-tsr2_p320.m4v This is the full 12Mb file. I can upload a truncated version if you prefer (and if this will be sufficient to diagnose the problem). Cheers, Matt
Matthew Gertner wrote:
Baptiste COUDURIER wrote:
Hi
Matthew Gertner wrote:
Matthew Gertner wrote: [...]
Should I be posting this to ffmeg-devel instead?
Matt
Can you upload a sample somewhere ?
http://www.allpeers.com/blog/downloads/da_vinci_code-tsr2_p320.m4v
This is the full 12Mb file. I can upload a truncated version if you prefer (and if this will be sufficient to diagnose the problem).
Cheers, Matt
I tried the file with ffmpeg svn and there was no crash. MvH Benjamin Larsson -- "incorrect information" is an oxymoron. Information is, by definition, factual, correct.
Benjamin Larsson wrote:
I tried the file with ffmpeg svn and there was no crash.
See my original comment. It doesn't crash with my FFMpeg build either, but it does crash when using Martin Bohme's frame extraction code (http://www.inb.uni-luebeck.de/~boehme/using_libavcodec.html). So it might be a problem with that example but it works for all the other formats I've tried that are FFMpeg-supported. Matt
participants (3)
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banan＠student.ltu.se -
baptiste.coudurier＠smartjog.com -
matthew＠allpeers.com