Weird ffmpeg bug

So, when I run:

C:\Luxrender\BLENDER\Projects\WipEout_Equaliz\Venom\OUT3>ffmpeg -r 120 -i Frame_%04d.png -i "C:\Users\Nofew\Documents\My Games\Ironclad Games\Sins of a Solar Empire Rebellion\Mods-Rebellion v1.1\Distant Stars (R) ALPHA 0.12\Sound\Battle 16.ogg" -vcodec libx264 -preset ultrafast -crf 23 -movflags faststart -pix_fmt yuv420p OUT23.mp4

it outputs a video 49 minutes long, with no motion, and weird "choppy" sound.

When I run:

C:\Luxrender\BLENDER\Projects\WipEout_Equaliz\Venom\OUT3>ffmpeg -r 120 -i Frame_%04d.png -i "C:\Alienware\Battle 16.flac" -vcodec libx264 -preset ultrafast -crf 23 -movflags faststart -pix_fmt yuv420p OUT23.mp4

it outputs a video that's out of sync with the audio. It seems to be a constant rate.


Other .png streams and .ogg's work just fine. It's just this very specific stream with this very specific audio.