[FFmpeg-user] Non-mandatory audio

Greg Oliver oliver.greg at gmail.com
Wed Oct 14 18:17:35 EEST 2020

On Tue, Oct 13, 2020 at 8:50 AM Mar Andrés López <mar.andres.l at gmv.com>

> Dear all,
> I am using the following command to generate dash content from a file:
> ffmpeg -i video.mp4 –r 25 -c:v libx264 -c:a aac -b:a 128k -ac 1 -ar 44100
> -map v:0 -b:v:0 2M -map v:0 -b:v:1 145k -map v:0 -b:v:2 365k -map 0:a -f
> dash dash.mpd
> But sometimes I have streams with audio and sometimes not. Is there anyway
> to make this command to not break if the video file does not contains audio?
> A lot of thanks

Assuming you are scripting this, probe the file first and check for audio.
Use a separate ffmpeg command line for eac result.

ffprobe <infile> | grep "Stream.*Audio"
if [ $? -eq 0 ]; then
    ffmpeg command with audio
    ffmpeg command without audio

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