Well, I did find a bug with the new audio speedup command for FFmpeg safe mode:
1. For a 24fps -> 25fps speedup the command
-filter:a "atempo=1,0427" is added. This crashes FFmpeg, you need to use a decimal point instead of a comma. (My system locale is set to standard German) Also, shouldn't the factor be 1.04
17?
2. The speedup command must not be used if FFmpeg Safe Mode is also used for video. In this case (without AviSynth) the video does not get sped up, DGPulldown is used instead. So the audio should not have a speedup command, too.
Cheers
manolito