Hi

I'm using ffmpeg to transcode and map the audio track of a .mkv file to stream 
it to a browser via HTTP.

ffmpeg -i input.mkv -map 0:0 -map 0:1 -strict experimental -c:v copy -c:a aac 
-b:a 120k output.mkv

After that I'm able to stream it with a node server to a browser including the 
ability to jump forward with HTTP partials.

Now I'm looking for a way to transcode in real time on every HTTP request. I 
use nodes fluent ffmpeg module which works for live streams. For VOD I need to 
know the size of the output file in advance. Moreover I need to able to 
calculate a time offset of a partial request which is also in bytes.

Is that possible?

Thanks,

Björn
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