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I'm trying to concatenate two mp4 files using ffmpeg. I need this to be an automatic process hence why I chose ffmpeg. I'm converting the two files into.ts files and then concatenating them and then trying to encode that concated.ts file. The files are h264 and aac encoded and I'm hoping to keep the quality the same or as close to original as possible.
FFmpeg has three concat methods. (in Windows, use double quotes ') ffmpeg -i 'concat:input1 input2' -codec copy output ffmpeg -i opening.mkv -i episode.mkv -i ending.mkv -filter_complex '[0:0] [0:1] [1:0] [1:1] [2:0] [2:1] concat=n=3:v=1:a=1 [v] [a]' -map '[v]' -map '[a]' output.mkv Note that this method performs a re-encode. $ cat mylist.txt file '/path/to/file1' file '/path/to/file2' file '/path/to/file3' $ ffmpeg -f concat -i mylist.txt -c copy output for Windows: (echo file././././1.mp4 & echo file././././2.mp4 )>%tmp%/list.txt ffmpeg -safe 0 -f concat -i%tmp%/list.txt -c copy c:/output.mp4 Which one to use • concat protocol: use with formats that support file level concatenation (MPEG-1, MPEG-2 PS, DV). • concat filter: use if you need to re-encode such as when applying filters or when your files use different codecs (or you could re-encode the ones that 'don't match' so they are the same codec, then use a different option, to avoid re-encoding parts of your input).
• concat demuxer: use when you want to avoid a re-encode and your format does not support file level concatenation. If in doubt try the concat demuxer. Also see • •. Here's a fast (takes less than 1 minute) and lossless way to do this without needing intermediate files:- ls Movie_Part_1.mp4 Movie_Part_2.mp4 perl -ne 'print 'file $_' ffmpeg -f concat -i - -c copy Movie_Joined.mp4 The 'ls' contains the files to join The 'perl' creates the concatenation file on-the-fly into a pipe The '-i -' part tells ffmpeg to read from the pipe (note - my files had no spaces or weird stuff in them - you'll need appropriate shell-escaping if you want to do this idea with 'hard' files). I was trying to concatenate three.mp3 audio files into one.m4a file and this ffmpeg command works.
Input command: ffmpeg -i input1.mp3 -i input2.mp3 -i input3.mp3 -filter_complex concat=n=3:v=0:a=1 -f MOV -vn -y input.m4a Meanings of: ' -filter_complex concat=n=3:v=0:a=1': concat means use the media concatenate (joining) function. N means confirm total count of input files. V means has video?
Use 0 = no video, 1 = contains video. A means has audio? Use 0 = no audio, 1 = contain audio. -f means force set file format (to see all supported formats, use ffmpeg -formats) -vn means disable video (and also -an would disable audio if not wanted) -y means overwrite output files (if the output file already exists). For more info: use ffmpeg -h full print all options (including all format and codec specific options, very long). FOR MP4 FILES For.mp4 files (which I obtained from DailyMotion.com: a 50 minute tv episode, downloadable only in three parts, as three.mp4 video files) the following was an effective solution for Windows 7, and does NOT involve re-encoding the files. I renamed the files (as file1.mp4, file2.mp4, file3.mp4) such that the parts were in the correct order for viewing the complete tv episode.
Then I created a simple batch file (concat.bat), with the following contents::: Create File List echo file file1.mp4 >mylist.txt echo file file2.mp4 >>mylist.txt echo file file3.mp4 >>mylist.txt:: Concatenate Files ffmpeg -f concat -i mylist.txt -c copy output.mp4 The batch file, and ffmpeg.exe, must both be put in the same folder as the.mp4 files to be joined. Then run the batch file. It will typically take less than ten seconds to run.
Detailed documentation on various ways of concatenation in ffmpeg can be. You can use for quick concatenation. Bardhan Udry Development Microeconomics Pdf File. It performs a re-encode. This option is best when inputs have different video/audio formats. For Concatenating 2 files: ffmpeg -i input1.mp4 -i input2.webm -filter_complex '[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]' -map '[v]' -map '[a]' output.mp4 For Concatenating 3 files: ffmpeg -i input1.mp4 -i input2.webm -i input3.mp4 -filter_complex '[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1 [v] [a]' -map '[v]' -map '[a]' output.mp4 This works for same as well as multiple input file types.