2000420 - playback wants to buffer the whole file if mkv

Status: NEW

(Core :: Audio/Video: Playback, defect, P2)

Description

[ivan g]

after upgrading to firefox 145 in macos I started seeing problems when playing my files, which all are mkv. specially with h264 I am able to reproduce the issue many times in which when clicking playing, it tries to buffer the whole file and the playback doesn't start

try with either of these files, first download them then run an http server that support ranges

• https://repo.jellyfin.org/archive/jellyfish/media/jellyfish-30-mbps-hd-hevc.mkv
• https://repo.jellyfin.org/archive/jellyfish/media/jellyfish-30-mbps-hd-h264.mkv

$ pip install rangehttpserver
$ python3 -m RangeHTTPServer

more context is avail in https://github.com/jellyfin/jellyfin/issues/15521

Comment 1

[ivan g]

Attachment: huge download when trying to playback

shows that it's buffering too much and no playback starts

Comment 2

[ivan g]

I want to add the helpful feedback from github/afontenot user

here are two 30 second clips. Opening the first one in Firefox refuses to play until it's buffered the entire file (~60 MB). The second one starts playing immediately, even though you can see that it has not loaded the whole file.

audio.mkv << issue

noaudio.mkv << no issue

I reproduced this in 147 nightly (via AppImage) so this is definitely not fixed.

Comment 3

[Alastor Wu [:alwu]]

I can reproduce this, I will take a look. Keep NI.

Comment 4

[rpnpif]

Please enable the mkv files playback as soon as possible by the #1422891 bug that is very old. Webm files work fine. And MP4 that are very closed as architecture work also fine. Today we cannot play MKV on Firefox for security reason (sic).