How to batch merge video & audios with same name inside a folder in Windows

[maxteddy]

Hi everybody

I want to merge videos and audios with exact same name (1.mp4/1.acc and so on) in batch mode quickly using ffmpeg or any other tools that can do that?

This screenshot might help: https://forum.videohelp.com/images/imgfiles/lZc0q2f.png

Can you please help me do that? I don't know bash or powershell so I really appreciate it if you help me with a snippet.

Thanks again.

[jagabo]

Do the mp4 files contain audio or subs? If not:

md New
for %%F in (*.mp4) do ( 
    ffmpeg -y -i "%%~nxF" -loglevel info -i "%%~nF.aac" -c copy -map 0:v -map 1:a  "New\%%~nxF" )
)
pause

New files are created in a subfolder named New.

[maxteddy]

Do the mp4 files contain audio or subs? If not:

md New
for %%F in (*.mp4) do ( 
    ffmpeg -y -i "%%~nxF" -loglevel info -i "%%~nF.aac" -c copy -map 0:v -map 1:a  "New\%%~nxF" )
)
pause

New files are created in a subfolder named New.

Thank you so much your script works perfectly but I have another problem. If I merge a video and an audio using mkvtoolnix everything is fine, but using ffmpeg (whether your batch-script or a just a single command) still at the last stages of the process it throws lots of "Non-monotonous DTS in output stream 0:1; previous: 188443498, current: 188338176; changing to 188443499. This may result in incorrect timestamps in the output" and the output is not sync. https://forum.videohelp.com/images/imgfiles/pdQQcaC.png

Why ffmpeg does not do what mkvtoolnix does when it comes to merging?

[jagabo]

I don't know why ffmpeg gives those warnings. Is it giving you A/V sync problems? If you get so many errors that the processing is being slowed you can change the log level to ignore warnings. Add "-loglevel error -stats" to the ffmpeg line:

ffmpeg -y  -loglevel error -stats -i "%%~nxF" -loglevel info -i "%%~nF.aac" -c copy -map 0:v -map 1:a  "New\%%~nxF" )

If you're getting A/V sync problems I'll need a sample pair to test with.

[maxteddy]

I don't know why ffmpeg gives those warnings. Is it giving you A/V sync problems? If you get so many errors that the processing is being slowed you can change the log level to ignore warnings. Add "-loglevel error -stats" to the ffmpeg line:

ffmpeg -y  -loglevel error -stats -i "%%~nxF" -loglevel info -i "%%~nF.aac" -c copy -map 0:v -map 1:a  "New\%%~nxF" )

If you're getting A/V sync problems I'll need a sample pair to test with.

Thanks again @jagabo

Brought those files to another pc just to see the result and it worked well over there. So I think the problem was FFmpeg itself. Just tried to use another release of FFmpeg binary and fortunately everything is working like a charm now!
Thank you again.
[solved]