I want to use VDubMod to make psp videos from my VOBs, since I want to use VobSub to get nice big subtitles that are readable. So I'm saving out an AVI with a x264 video track and AC3 audio, then running ffmpeg.exe -y -i "x264_ac3_subbed.avi" -title "goats gone wild" -timestamp "2005-12-14 12:06:35" -vcodec copy -acodec aac -ac 2 -ar 48000 -ab 48 -vol 384 -f psp "MAQ10001.MP4" But the resulting MP4 is unplayable. VLC shows nothing, QuickTime says "an invalid sample description was found in the file" The AVI plays just fine.

Repeat with me: "This is my way, not the army way". Everytime you use Vdub(mod) with x264 repeat that phrase...

YAMB might be helpful,...

megui with psp profile and after that f* the resulting .mp4 with these atomchanger tools, so the dumb psp can read it

Nero Recode might be a start: (though I don't know about the subtitle part)