Question / Help ffmpeg command for remuxing like obs

[Catakryst]

I'd like to remux a bunch of recordings using powershell and have ffmpeg installed. In particular, I want to turn flv's into mp4's. I have around 100 recordings I want to remux.

Does obs studio use ffmpeg to remux? What command can I use to replicate that? I'm worried about edge cases like multiple tracks.

 

[Dilaz]

ffmpeg -i file.flv -c:v copy -c:a copy file.mp4

 

[Catakryst]

that doesn't keep the multiple audio tracks

 

[Harold]

FLV can't save multiple audio tracks.

 

[Catakryst]

Sorry, that's my bad. What about mkv's with multiple tracks?

 

[Harold]

the ffmpeg command should copy the tracks just fine

 

[authorleon]

Hello, I have tried this but it does not work. Can you advise please.

for /R %f IN (*.mkv) DO ffmpeg -i "%f" -c:v copy -c:a copy "%~nf.mp4"

I only get 1 audio track. I have used 5. Thank you

 

[Zeros.81]

Use "-map 0" option

Map – FFmpeg

trac.ffmpeg.org

ffmpeg -i input -map 0 -c copy output.mp4 # copies all video and audio channels from input one to output, not just one video