[FFmpeg-user] amid fails when there are more than 8 input channels (in one file)

Paul B Mahol onemda at gmail.com
Wed May 2 17:15:44 EEST 2018

On 5/2/18, Bouke / VideoToolShed <bouke at videotoolshed.com> wrote:
>> On 02 May 2018, at 15:56, Paul B Mahol <onemda at gmail.com> wrote:
>> On 5/2/18, Bouke / VideoToolShed <bouke at videotoolshed.com> wrote:
>>> Hi all,
>>> Strange thing, more than 8 channels give silent output:
>>> ffmpeg -i 9Ch_orMore.WAV -filter_complex "[0:0][0:0]
>>> amix=inputs=2,pan=mono|c0=c0+c1" -ac 1 mono.wav
>>> gives on errors whatsoever, but output is silent.
>>> Is this a bug or user error?
>> User error, same as many typos you managed to make.
> Hi Paul, (my new best friend),
> We can continue in Dutch if you mind my typos. Would that be an option for
> you?
> Now, since you can be bothered to read trough the nonsense I write, can you
> also be bothered to give a slight indication on where my command line does
> work for files with <9 channels but fails when input files are >8 channels?
> Oh, don't bother to be polite, I'm just trying to get the show on the road.

amix works up to 1024 channels, but aresample filter that may be used
before amix or after it, will need know channel layout to operate at all.

So could you give full command you tried and also more info about input file?
If you can, it would be best if you provide sample too.

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