[FFmpeg-user] wav concat woes

RDP gliese849b at gmail.com
Tue Apr 29 19:11:51 CEST 2014

On Mon, Apr 28, 2014 at 10:41 AM, Moritz Barsnick <barsnick at gmx.net> wrote:
> On Mon, Apr 28, 2014 at 07:24:14 +0100, RDP wrote:
>> >> > cat 01_list.txt
>> >> > file '01/01.01_test.wav'
>> >> > file '01/01.02_test.wav'
>> >> > file '01/01.03_test.wav'
>> >> > file '01/01.04_test.wav'
>> >> >
>> >> > ffmpeg  -f concat -i 01_list.txt -vn -c:a libfdk_aac    -profile:a aac_he
>> >> > -b:a 48k -ac 1 -signaling implicit    test2.m4a 2> ffmpeg.out
>> >> > And I can run the command on each individually.
>> I was specifically targetting the quoted use of the cat command here,
>> not ffmpeg.
>> cat does exactly what it says on the tin, i.e. joins files together.
>> cat does not diffentiate between types of file, other than text and
>> binary, and therefore has no knowledge of format of a wave file.
> Chris, where do you see the use of 'cat' to combine files in the
> original request? Sean used 'cat' only to show the content of the file
> handed to ffmpeg's concat muxer. It's all about ffmpeg here.

Quite right Moritz, I'm seeing things that aren't there!  Sean was indeed
referring to concatenation within ffmpeg.  My apologies.

What was in my mind I think, is that some file formats don't go down this
extra header route, which makes conjoining and splitting files real easy.



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