If i download an av1 file, then vlc player will play it perfectly

however, if i convert an mp4 (avc video, aac audio) to av1, then vlc player won't play it

this is the command i'm using with ffmpeg:

C:\Users\l\Desktop\6-app\ffmpeg -i y.mp4 -c:v libaom-av1 -crf 30 -b:v 0 -strict 
experimental -vf scale=640:360 -r 30 -ab 192k -ar 48k -map_chapters -1 -map_metadata -1 z.mkv

? why won't vlc player play this

I can't post the ffprobes here because of charachter limits

however, i have the ffprobe results here


here's the file that was used to convert to av1


here's the non-working file


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