[FFmpeg-user] Non-mandatory audio

[Greg Oliver]

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

> 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
else
    ffmpeg command without audio
fi