Complementing my message below, the unit test in inst/VideWriter.m passed
successfully when the sources were compiled against ffmpeg 4, for
instance in this build:
https://buildd.debian.org/status/fetch.php?pkg=octave-video&arch=amd64&ver=2.0.2-1%2Bb2&stamp=1650535691&raw=0
* Rafael Laboissière <raf...@debian.org> [2022-08-13 10:49]:
* William 'jawn-smith' Wilson <jawn-sm...@ubuntu.com> [2022-08-02 17:35]:
Package: octave-video
Followup-For: Bug #1004770
User: ubuntu-de...@lists.ubuntu.com
Usertags: origin-ubuntu kinetic ubuntu-patch
Control: tags -1 patch
Dear Maintainer,
The first patch I submitted was a bit messy and failed to build with
older versions of ffmpeg. A version with this patch has built
successfully for me in Ubuntu kinetic and Debian sid.
In Ubuntu, the attached patch was applied to achieve the following:
* d/patches/ffmpeg5.patch: Update to FFMPEG 5 API.
Thanks for considering the patch.
Thank you for your patch. The package builds fine on my amd64 Debian
sid system against ffmpeg 5. However, one of the unit test is failing:
$ echo 'pkg load video; test VideoWriter' | octave-cli -q
fatal: caught signal Segmentation fault -- stopping myself...
Segmentation fault
Further investigation, when running the code of the unit test by hand,
shows that the problem happens in the method writeVideo of the
VideoWriter class:
$ octave-cli -q
octave:1> pkg load video
octave:2> fn = fullfile (tempdir(), "rainbow.mp4");
octave:3> width = 200;
octave:4> height = 150;
octave:5> nframes = 120;
octave:6> p = permute (rainbow (width), [3 1 2]);
octave:7> raw_video = zeros (height, width, 3, nframes);
octave:8> w = VideoWriter (fn);
octave:9> for k=1:nframes
disp (k)
ps = circshift (p, k * 6);
img = uint8 (255 * repmat (ps, height, 1));
raw_video (:, :, :, k) = img;
writeVideo (w, img);
endfor
1
fatal: caught signal Segmentation fault -- stopping myself...
Segmentation fault
Ultimately, I noticed that the problem arises in the call of the
function __writer_open__, defined in src/cap_ffmpeg_wrapper.cc.
Do you experience the same problem in your system?
Best,
Rafael Laboissière
