Better proxy and misc fixes

commit 3acad066 (HEAD -> better_proxy_and_fixes, thiblahute/better_proxy_and_fixes) Author: Thibault Saunier tsaunier@igalia.com Date: Tue Mar 3 17:27:02 2020 -0300

previewers: Avoid changing number of channels creating proxies

We were forcing it 1 channel because of the way the previer was
implemented

Fixes https://gitlab.gnome.org/GNOME/pitivi/issues/2338

commit 54f2edfe Author: Thibault Saunier tsaunier@igalia.com Date: Tue Mar 3 17:09:33 2020 -0300

Use quicktime instead of matroska as proxy container

Quicktime is more used in the industry and GStreamer better handles
it and allows us to be frame accurate, matroska has issue with
frame accuracy seeks.

commit 66ac5347 Author: Thibault Saunier tsaunier@igalia.com Date: Tue Mar 3 15:27:07 2020 -0300

Handle proxy duration not matching its original file duration

Fixes https://gitlab.gnome.org/GNOME/pitivi/issues/2324

commit 12e5c4b0 Author: Thibault Saunier tsaunier@igalia.com Date: Tue Mar 3 15:24:19 2020 -0300

proxy: HD proxies are not 'shaddow' when not creating scaled version