Re: [PD] gem segfault when opening video
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 2013-02-18 22:42, Charles Goyard wrote: Hi, when opening a .mov file on pd-extended on linux, I get : [...] Segmentation fault (core dumped) On the command line, gmerlin fails to open the file as well, with the same message, but lqtplay is able to play the movie. by the same message, do you mean that gmerlin also segfaults? However, it seems these messages are contradictory : [pix_film:track] No video decoder found for fourcc avc1 (0x61766331) verbose(5): gmerlin: succeeded i think it's a bug in gmerlin rather than Gem. so gmerlin first thinks it can decode the film and then fails (something that happens to humans as well). it would be great if you could provide a (short) clip that triggers the crash, so the underlying bug can be fixed. I'm not sure it's a bug. Maybe there's a way to force pix_film to use a specific backend ? actually there is an undocumented and little tested extra argument to open that allows you to give a given backend priority (that is: the given backend will be tried first, and then all the rest): [open foo.mov RGBA quicktime4linux( should use lqt4l before gmerlin. come to think of it, i think the API should be changed to be consistent with [pix_video]. e.g. [driver quicktime4linux, open foo.mov( to exclusively(!) select lqt for opening any file. fgamsdr IOhannes -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlEjPO4ACgkQkX2Xpv6ydvQUCgCfTZkfNnWo2L/a37q6Gz36BhkH 02EAnRIV/OCzCqVpSO8rX993408uk651 =5YiD -END PGP SIGNATURE- ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] gem segfault when opening video
Hi IOhannes, when opening a .mov file on pd-extended on linux, I get : [...] Segmentation fault (core dumped) On the command line, gmerlin fails to open the file as well, with the same message, but lqtplay is able to play the movie. by the same message, do you mean that gmerlin also segfaults? No, I mean No video decoder found for fourcc avc1 that I quoted below. i think it's a bug in gmerlin rather than Gem. so gmerlin first thinks it can decode the film and then fails Yes, that's sound just like it. Because gmerlin returns the right video size and frame count[1]. That can be tricky to handle in a reliable and consistent way. However, I would blame Gem for the segfault. Maybe Gem could check if the pointer to the video stream is valid before using it? it would be great if you could provide a (short) clip that triggers the crash, so the underlying bug can be fixed. Here's one and a test patch: http://charles.goyard.free.fr/temp/ actually there is an undocumented and little tested extra argument to open that allows you to give a given backend priority (that is: the given backend will be tried first, and then all the rest): [open foo.mov RGBA quicktime4linux( should use lqt4l before gmerlin. This does the trick with Gem from git but not Gem in pd-extended. Thanks ! come to think of it, i think the API should be changed to be consistent with [pix_video]. e.g. [driver quicktime4linux, open foo.mov( to exclusively(!) select lqt for opening any file. Sounds good to me. Thanks, Charles [1] btw the help files for pix_film and pix_movie mention fps instead of frame count. ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] gem segfault when opening video
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 2013-02-19 11:36, Charles Goyard wrote: it would be great if you could provide a (short) clip that triggers the crash, so the underlying bug can be fixed. Here's one and a test patch: http://charles.goyard.free.fr/temp/ hmm, both Gem (i tried 0.93.git:ee897d5 and 0.93.3 from Debian) and gmerlin (1.2.0~dfsg-3 from Debian) can play the file just fine here. if i just call it with `gmerlin_play` i get: $ gmerlin_play crashme.mov [avdecoder.audio_ffmpeg] Warning: Codec not found: FFmpeg Sonic decoder [avdecoder.superindex] Info: Detected B-pyramid, fixing possibly broken timestamps Segmentation fault $ actually there is an undocumented and little tested extra argument to open that allows you to give a given backend priority (that is: the given backend will be tried first, and then all the rest): [open foo.mov RGBA quicktime4linux( should use lqt4l before gmerlin. This does the trick with Gem from git but not Gem in pd-extended. Thanks ! you could also just deinstall the GMERLIN-backend (if you don't need it for other stuff). since PdX gives you an all or nothing, you'd had to remove (or rename) the gem_filmGMERLIN.so file. [1] btw the help files for pix_film and pix_movie mention fps instead of frame count. ah yes, and the fps is reported as well, though that's not mentioned at all. fgam,sdr IOhannes -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlEjcToACgkQkX2Xpv6ydvRU1gCdH23nXMex46sIr2gH7hyTpbUx nI0AoL/tO2pLOL5YR71OnBmQsZ/70D7g =iMm3 -END PGP SIGNATURE- ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] gem segfault when opening video
Hi,
thanks for trying.
IOhannes m zmoelnig wrote:
hmm, both Gem (i tried 0.93.git:ee897d5 and 0.93.3 from Debian) and
gmerlin (1.2.0~dfsg-3 from Debian) can play the file just fine here.
Now that's strange. A big difference is that I run on Archlinux.
I have:
gmerlin 1.2.0
gavl 1.4.0
libquicktime 1.2.4
gmerlin seems to be built with libquicktime as a dependency. I even
tried applying your fix_zeroplugins.patch from the debian package,
it didn't fixed it :).
you could also just deinstall the GMERLIN-backend (if you don't need
it for other stuff). since PdX gives you an all or nothing, you'd had
to remove (or rename) the gem_filmGMERLIN.so file.
I'm more ok with converting the video to mpeg :).
However, I really love the possibility to force the selection of the
backend.
With gdb I could see that the crash occurs inside
filmGMERLIN::getFrame(void), on this line :
bgav_read_video(m_file, m_gframe, m_stream);
m_stream is a null pointer there. I changed :
bgav_set_video_stream(m_file, m_stream, BGAV_STREAM_DECODE);
if(!bgav_start(m_file)) {
close();
return false;
}
to:
bgav_set_video_stream(m_file, m_stream, BGAV_STREAM_DECODE);
if(!bgav_start(m_file) || !m_stream) {
close();
return false;
}
and now at least it does not segfaults. Maybe there's something nicer to
do (printing an error message on the console ?), but it looks like a
good start.
Cheers,
Charles
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Re: [PD] gem segfault when opening video
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 2013-02-19 11:36, Charles Goyard wrote: come to think of it, i think the API should be changed to be consistent with [pix_video]. e.g. [driver quicktime4linux, open foo.mov( to exclusively(!) select lqt for opening any file. Sounds good to me. implemented in git. fgmasdr IOhannes -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlEjtjkACgkQkX2Xpv6ydvT4IACfRxpkmGduVePjbwbQQG08H+h3 gycAn19z1ryAoEJ/puMor45D5wLbbdj8 =Q3QD -END PGP SIGNATURE- ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] gem segfault when opening video
Charles Goyard wrote:
With gdb I could see that the crash occurs inside
filmGMERLIN::getFrame(void), on this line :
bgav_read_video(m_file, m_gframe, m_stream);
m_stream is a null pointer there. I changed :
bgav_set_video_stream(m_file, m_stream, BGAV_STREAM_DECODE);
if(!bgav_start(m_file)) {
close();
return false;
}
to:
bgav_set_video_stream(m_file, m_stream, BGAV_STREAM_DECODE);
if(!bgav_start(m_file) || !m_stream) {
close();
return false;
}
and now at least it does not segfaults. Maybe there's something nicer to
do (printing an error message on the console ?), but it looks like a
good start.
To be more complete: Gem seems to fall back to quicktime4linux after
failing in gmerlin and the film plays OK.
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