Hi Reza, selamat malam.

first thing first are sure your m4a files is not corrupt ? and what media player you use to play them ?

also try using mpv or vlc video player they usually the best around out of the box.

if the problem still occur try installing various gstreamer packages.

cheers.

I use mpv and audacity
I also reinstalled gstreamer but there is still a problem

Mohammadreza wrote:

I use mpv and audacity

how about the mpv output? you can get useful debug message by starting applications from terminal like this:

$ cd /place/of/your/file/
$ mpv --player-operation-mode=pseudo-gui yourvideo.m4a

alternatively you can just convert your m4a files first into supported format like audacity said

I also reinstalled gstreamer but there is still a problem

i found some article same as your case here https://bbs.archlinux.org/viewtopic.php?id=34868

try to look them out

hi again.

jm just tested recently, m4a can be played just fine with mpv and audacity.

maybe ensure these packages installed properly.

ffmpeg
xvidcore
gstreamer
gst-editing-services
gst-plugins-base
gst-plugins-good
gst-plugins-bad
gst-plugins-ugly

Tnx
Solved