I want to add new audio stream (ONE) to some video file (which already has 1 or more audio streams):
ffmpeg.exe -y -i "C:\video.mp4" -i "C:\video Fre.mp4" -c:v copy -c:a copy -map 0:v -map 0:a -map 1:1 -map_metadata 0 -metadata:s:a:0 language=eng -metadata:s:a:1 language=fre "C:\result_1.mp4"
Now I manually set language metadata for existing stream (-metadata:s:a:0 language=eng) and also manually set number for new audio stream (metadata:s:a:1). Is there any possibility set metadata for the LAST audio stream just like:
-metadata:s:a:last language=fre
And can I to automatic copy language metadata from existing audio streams? (not to set them each time manually, just to copy from source video file).
