6/11/2023 0 Comments Ffmpeg concat demuxer![]() setting the input option “async >= 2” will allow resampling of audio, permitting stretching/shrinking to match the wanted number of samples per frame, before ffmpeg muxes the output. FPS slows) to match the mux content length. meaning you may have “playable but not perfect” inputs which are missing a few audio packets each, probably at the head or tail of the files, and the result causes the video time base to grow (ie. it’s possible the a/v program lengths don’t match up perfectly, resulting in the computed FPS of concatenated mux output not matching the individual input FPSs. The default value 1 will reject absolute paths in the text file. safe 0 is added so that any file name will be accepted. ffmpeg -f concat -safe 0 -i joinvideo.txt -c copy outputdemuxer.mp4. ![]() Make text file containing: file '1.mp4' file '2.mp4' Run ffmpeg: ffmpeg -f concat -i input.txt -c copy output. Note : You can add more than two video files. Putting backslash doesnt help, because ffmpeg reads the filename. concat video filter Use this method if your inputs do not have the same parameters (width, height, etc). If this doesn’t help, one might also try “-async 100” or something and allow transcoding of the audio program (perhaps stay with the same codec and allow for a slightly higher bitrate) sample count to adapt to the actual frame count. how can I concatenate different videos while maintaining the original quality and aspect ratio using concat demuxer. I want to concatenate files with ffmpeg using Concat demuxer as described in this. FFmpeg has three concatenation methods: 1. Setting the input playback rate of -r 30 for should propagate to the output mux. since you’re not transcoding, forcing a “-vf=fps=30” probably won’t work. This is analogous to using cat on UNIX-like systems or copy on Windows. Certain files (MPEG-2 transport streams, possibly others) can be concatenated. ![]() Recommend experimenting with the input options -copytb 0/1 (you’ll probably want copytb 0) and -vsync 0/1 (probably vsync 1, or vsync cfr in ffmpeg 5.0 and later). While the demuxer works at the stream level, the concat protocol works at the file level.
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