It creates a valid playable file but all files in the concat file are not added. The concat demuxer does not work correct. > - *concat demuxer*: use when you want to avoid a re-encode and your > format does not support file level concatenation. > - *concat filter*: use if you need to re-encode such as when applying > filters.
If put them side-by-side via FFMPEG, it will end as a 24~30fps video.
A second copy of the secondary video is then overlaid on the expanded canvas. Then it's filled with black and stacked to the right of the main video. The scale2ref resizes one copy of the secondary video to the height of the main video while keeping its original width. out1.mkv is a Matroska container file and accepts video, audio and subtitle streams, so ffmpeg will try to select one of each type. There are three output files specified, and for the first two, no -map options are set, so ffmpeg will select streams for these two files automatically. Yoiu must download it from the link below since the one in Ubuntu Software Center is to old. The naming for output files is done automatically. For your need you must use bulk option then drop all files that you need converted and choose the appropriate options. It is called dmMediaConverter and it is a simple frontend for ffmpeg. For a single file: ffmpeg -i input.avi -an -c:v copy output.mkv To do every file in a directory, you can use a for loop. I suspect you are having problems because you are trying to overwrite the input file with the output, ffmpeg just doesn't work that way. avi files in a directory: for %%f in (*.avi) do ( echo file %%f > list.txt ) ffmpeg -f concat -safe 0 -i list.txt -c copy output.avi del list.txt See Concatenate in ffmpeg docs. Here's a Windows batch file to concatenate all. That's not really an ffmpeg issue though, it's a programming/scripting issue that happens to run ffmpeg. Yes it is, you need a script that generate a list with all the files in a directory, concats and muxes that list with ffmpeg and then run it for every directory (which can also be automated).
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