Public bug reported:

In k3b you can rip DVD's. There are two filetypes you can use: MPEG4
(FFMPEG) and XviD. The latter one works, the first NOT.


1) The first error it receives is this:

*** glibc detected *** /usr/bin/transcode: munmap_chunk(): invalid
pointer: 0x00007fb245badc25 ***

> See also backtrace 1 below

2) After advice from https://bugs.archlinux.org/task/26208 I created
~/.ffmpeg/medium.ffpreset with one dummy line starting with #.

The video is starting to encode, but there is another error:

*** glibc detected *** /usr/bin/transcode: free(): invalid pointer:
0x00007f5e1e16879a ***

> See also backtrace 2 below

3) When I try to start (on the command line) one of the transcode
commands I've found at the end of the log file:

/usr/bin/transcode --nice 19 --log_no_color --progress_meter 2
--progress_rate 272 -i /dev/sr0 -x dvd -T 1,-1,1 -a 0 -j 0,0,0,0 -R
1,/tmp/kde-jeroen/k3b_0.log -y ffmpeg,null -o /dev/null -F mpeg4 -w 1200
-Z 768x576

... it started to encode, but I receives this:

"Segmentatiefout (geheugendump gemaakt)" < Dutch for Segmentation fault
(memory/core dumped)

Backtrace 1)

[export_ffmpeg.so] Using FFMPEG codec 'mpeg4' (FourCC 'DIVX', MPEG4 compliant 
video).
[export_ffmpeg.so] No profile selected
[export_ffmpeg.so] Error opening configuration file ./ffmpeg.cfg: No such file 
or directory
[export_ffmpeg.so] Starting 1 thread(s)
[export_ffmpeg.so] Set display aspect ratio to input
[export_ffmpeg.so] Parsing ffmpeg preset 'medium'
File for preset 'medium' not found
*** glibc detected *** /usr/bin/transcode: munmap_chunk(): invalid pointer: 
0x00007fb245badc25 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7eb96)[0x7fb2582b6b96]
/usr/lib/transcode/export_ffmpeg.so(+0x60ec)[0x7fb245ba80ec]
/usr/lib/transcode/export_ffmpeg.so(+0x85f4)[0x7fb245baa5f4]
/usr/lib/transcode/export_ffmpeg.so(tc_export+0x423)[0x7fb245bab4c3]
/usr/bin/transcode(tcv_export+0x32)[0x412c72]
/usr/bin/transcode(tc_encoder_init+0xbc)[0x413a6c]
/usr/bin/transcode(main+0x296a)[0x40abca]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7fb25825976d]
/usr/bin/transcode[0x40ce65]

Backtrace 2)

encoding=1 frame=41144 first=0 last=-1 fps=145.989 done=-1.000000 
timestamp=1645.760 timeleft=-1 decodebuf=0 filterbuf=9 encodebuf=11
encoding=1 frame=41422 first=0 last=-1 fps=145.924 done=-1.000000 
timestamp=1656.880 timeleft=-1 decodebuf=0 filterbuf=9 encodebuf=11
encoding=1 frame=41700 first=0 last=-1 fps=145.965 done=-1.000000 
timestamp=1668.000 timeleft=-1 decodebuf=0 filterbuf=9 encodebuf=11
*** glibc detected *** /usr/bin/transcode: free(): invalid pointer: 
0x00007f5e1e16879a ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7eb96)[0x7f5e3086fb96]
/usr/lib/x86_64-linux-gnu/libavutil.so.51(av_freep+0xc)[0x7f5e1ce369ec]
/usr/lib/x86_64-linux-gnu/libavutil.so.51(av_opt_free+0x3c)[0x7f5e1ce3706c]
/usr/lib/x86_64-linux-gnu/libavcodec.so.53(avcodec_close+0xf3)[0x7f5e1d32f328]
/usr/lib/transcode/export_ffmpeg.so(tc_export+0x65a)[0x7f5e1e1646fa]
/usr/bin/transcode(tcv_export+0x32)[0x412c72]
/usr/bin/transcode(tc_encoder_stop+0x9b)[0x413f8b]
/usr/bin/transcode(main+0x39af)[0x40bc0f]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7f5e3081276d]
/usr/bin/transcode[0x40ce65]

** Affects: k3b (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: dvdrip k3b transcode

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https://bugs.launchpad.net/bugs/1099201

Title:
  Transcode can't rip DVD's (in K3b with file type MPEG4)

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