>>27188693Whoever made the soundpost in /pcg/
made the soundpost = uploaded it to catbox and posted it on 4chinz originally got the audio by downloading an m4a that was sent through or uploaded via Discord. Renaming them to .m4a is not "enough" of a fix, the files are broken and need to be remuxed. Technobabble follows. Discord 1. fragments the m4a (ie. sets it up for DASH or HLS streaming...why the fuck does it do this for files that can't exceed 8 MB? who knows) 2. breaks the duration and has it show as 0. 3. Gives it a very out of spec file extension if and only if you download it with a Chromium based browser. Downloading them via Firefox saves as .m4a, but the file is still busted.
mp4box -info 380jme.mp3
# Movie Info - 1 track - TimeScale 44100
Duration 00:01:46.115 (recomputed 00:00:00.000)
Fragmented: yes - duration 00:00:00.000
11 fragments - 1 SegmentIndexes
Progressive (moov before mdat)
Major Brand dash - version 0 - compatible brands: iso6 mp41
Created: GMT Wed Jun 29 22:53:02 2022
# Track 1 Info - ID 1 - TimeScale 44100
Media Duration 00:01:46.115 (recomputed 00:00:00.000)
Track flags: Enabled In Movie
Media Info: Language "English (eng)" - Type "soun:mp4a" - 0 samples
Fragmented track: 4570 samples - Media Duration 00:01:46.115
Fragment sample defaults: duration 0 size 0 stsd 1 sync 1 padding 0 degradation_priority 0
MPEG-4 Audio AAC LC (AOT=2 implicit) - 2 Channel(s) - SampleRate 44100
RFC6381 Codec Parameters: mp4a.40.2
All samples are sync
Max sample duration: 0 / 44100
ren 380jme.mp3 380jme.m4a
mp4box -inter 500 380jme.m4a
Setting up iTunes/iPod file
Saving 380jme.m4a: 0.500 secs Interleaving
mp4box -info 380jme.m4a
# Movie Info - 1 track - TimeScale 44100
Duration 00:01:46.115
Fragmented: no
Progressive (moov before mdat)
Major Brand M4A - version 1 - compatible brands: iso6 mp41 M4A mp42
Created: GMT Wed Jun 29 22:53:02 2022
# Track 1 Info - ID 1 - TimeScale 44100
Media Duration 00:01:46.115
Track flags: Enabled In Movie
Media Info: Language "English (eng)" - Type "soun:mp4a" - 4570 samples
MPEG-4 Audio AAC LC (AOT=2 implicit) - 2 Channel(s) - SampleRate 44100
RFC6381 Codec Parameters: mp4a.40.2
All samples are sync
Max sample duration: 1024 / 44100
