cat on the Linux command line for a radically simple merge of
multiple MPEG4 files, will not work. You can check VLC on the result,
which will stop after the first part.
But this is not really surprising, the header is originating from the first file and still contains the information about the single file.
You can use
mencoder to merge multiple MPEG4 files into a new MPEG4
complete.mp4 using the following shell script:
#!/bin/bash if [ -s "complete.mp4" ]; then echo "$0: complete.mp4 exists... bailing out." exit 1 fi exec mencoder "$@" -ovc copy -oac copy -of lavf -lavfopts format=mp4 -o complete.mp4
This script will deny to overwrite an existing non-empty
drop a pre-existing file of that name first.
copy “codec” for audio and video indicate, that these is no re-encoding,
but just a re-wrapping into a new MPEG4 container file. No surprise that
this cal to
mencoder is only I/O bound and does not consume CPU time.