![]() If you have the video and audio streams in different files and want to create a single video file containing both streams, ffmpeg is also the tool of your choice. ![]() ![]() $ ffmpeg -f concat -i filestoconcatenate.txt -c copy concatenated.mp4 The ffmpeg command then looks as follows: To use it, you have to list the files you want to concatenate in a text file like such: In that case you can use the concat demuxer. Some file formats like mp4 cannot be joined using the concat protocol. ![]() Let’s say you found out with the first command that the subtitle streams you want are index 1 and 2 and the audio streams are 9 and 10. The video stream will most likely have the index 0. You can copy multiple streams into the output file with the -map x:y option, where x is the input file index and y the stream index in that file, both starting at 0. This tells ffmpeg to pass through all streams. To make a copy of the input files without transcoding, use the -c copy option. $ ffmpeg -i concat:"vts_01_1.vob|vts_01_2.vob|vts_01_3.vob|vts_01_4.vob"įfmpeg will now analyse the files and tell you which streams have which index. To concatenate the files, enter the keyword concat before the first input file and then separate the files by a pipe. Let’s say you have authored a DVD with one video stream, eight subtitles and two audio streams and you want to create a single vob file with video, the first two subtitles and both audio streams for further transcoding. To create a large video file from multiple video files, one does not simply cat into Mordor, because of different header information or stream mappings in the files.
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