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[ubuntu] Merge 2 MP4 files

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http://ubuntuforums.org – Hello everybody, I tried to merge 3 MP4 files using MP4Box / Mencoder, but it does NOT work: Code: $ sudo MP4Box -add 001.mp4 -add 002.mp4 -add 003.mp4 out.mp4 Unknown input file type Unknown input file type Unknown input file type Unknown input file type Unknown input file type Unknown input file type Converting to ISMA Audio-Video MP4 file... Saving to out.mp4: 0.500 secs Interleaving  $ sudo mencoder 001.mp4 002.mp4 003.mp4 -ovc copy -oac copy -of lavf format=mp4 -o output.mp4 mencoder: relocation error: mencoder: symbol codec_wav_tags, version LIBAVFORMAT_52 not defined in fil (Hardware)