My 2nd question is answered with the following string, which syncs the video to the audiostream:
Code:
ffmpeg -i video.flv -vsync drop -i audio.flv -c copy video-audio.flv -map 1:1
If anyone does have a better solution, please help me. :-)
EDIT: That didn't help. It only changed the length of the videoindex, not the framerate. :-(