Bento4 MP4Dash fails with audio?

Question

I am running Bento4 Mp4Dash to convert my fragmented video files into MPEG-DASH streaming videos. However I seem to get this error

ERROR: unsupported input file, more than one "traf" box in fragment

but only if I have audio enabled. I have found that if I run -an in FFMPEG (to ignore the audio tracks) my MP4Dash command runs just fine, any ideas as to why this would happen?

Answer 1

I solved the problem by telling ffmpeg to extract the audio from the file I wanted to convert to DASH. Here is my solution in case someone still needs them.

• extract audio
• generate second video file with no audio
• tell Bento4 Mp4Dash to use the video and the audio

For all steps there are tons of explainations how to do it on the internet. Here are some I found:

• extract audio with the -vn flag, ffmpeg to extract audio from video
• video without audio with the -an flag, Remove audio from video file with FFmpeg
• tell Bento4 to use them each by following the advice in the official Usage documentation, section Advanced usage: add both the video and audio file as input and add [type=video] before the video and [type=audio] before the audio file (no space in between)