`--output-format=mkv` does transcode instead of transmux about audiobook-dl HOT 2 OPEN

It should copy the codecs now when outputting to mkv. Hope it works

from audiobook-dl.

Can confirm that running:

$ ffmpeg -i foobar.mp4 -vcodec copy -acodec copy foobar.mkv

(where foobar.mp4 was produced by audiobook-dl)

executes really fast

But when opening that .mkv in VLC it displays loading indicator for a long time, and seems to only start playing the file after it's read the entire file.

For the .mp4 it starts playing instantly.

So more investigation is needed to make the resulting .mkv file be of "best practices".

My best guess is that the cover as mjpeg stream is causing this, but am not sure.

from audiobook-dl.