GNOME Bugzilla – Bug 693971
matroskademux: forward video cropping information downstream
Last modified: 2018-11-03 14:48:36 UTC
MKV-file headers may contains values to be used for players affecting top-, left-, right-, and bottom-pixels cropping. Totem does not currently recognize those header values, and just ignores them. This can be demonstrated using the mkvmerge GUI program and its header editor to fiddle with such values, and them running the resulting files through totem. Another player than totem (VLC) was tried, which recognized those values, and therefore cropped the video upon playing to remove the annoying border flickering that was experienced in that given file, without the need for the stream to be reencoded, and either suffering from a deterioration in quality, or becoming huge through lossless reencoding. (Consider this as an argument for the pertinence of this bug.) This bug can be experienced under Precise, using the as-of-current latest build of totem. Downstream at Launchpad: https://bugs.launchpad.net/ubuntu/+source/totem/+bug/1014264
Please provide version info of gstreamer and totem - or do you mean by "latest build" that you compiled git master yourself?
This is not supported yet, it needs support in matroskademux and the video decoder base class.
See bug #694068 for same bug in qtdemux
Where is the spec for this cropping information ?
-- GitLab Migration Automatic Message -- This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/83.