[FFmpeg-user] 7.1 wave filter complex amerge issue

[Bouke]

> On 24 Jan 2021, at 11:29, Paul B Mahol <onemda at gmail.com> wrote:
> 
> On Sun, Jan 24, 2021 at 11:26 AM Bouke <bouke at editb.nl <mailto:bouke at editb.nl>> wrote:
> 
>> Trying to remap channels in a 7.1 Wave file, but that gives me a strange
>> error.
>> 
>> (I’ve reduced my lines to the most simple to reproduce.)
>> 
>> When I use the same input file, but do a 5.1 remap it works as expected:
>> /Applications/ffmpeg -i /Volumes/Data/LC_testfiles/8chan.wav
>> -filter_complex
>> "[0:0][0:0][0:0][0:0][0:0][0:0]amerge=inputs=6,pan=5.1|c0=c0|c1=c1|c2=c2|c3=c3|c4=c4|c5=c5|[mix]"
>> -map "[mix]" -f null -
>> 
>> BUT, with 7.1 it fails
>> /Applications/ffmpeg -i /Volumes/Data/LC_testfiles/8chan.wav
>> -filter_complex
>> "[0:0][0:0][0:0][0:0][0:0][0:0][0:0][0:0]amerge=inputs=8,pan=7.1|c0=c0|c1=c1|c2=c2|c3=c3|c4=c4|c5=c5|c6=c6|c7=c7|[mix]"
>> -map "[mix]" -f null -
>> 
>> Is it me, or is this a bug?
>> 
>> Bouke
>> 
>> 
> 
> I thought you gonna amerge mono channels into 7.1, but you use already 7.1
> input.
> 

Yes, I know. This is the simplest way of showing that there is something strange going on.
The aim is to do a channel remap to get a correct channel layout for the R128 filter for eg 
So the mapping can be different, and could be something like:
-filter_complex "[0:0][0:0][0:0][0:0][0:0][0:0][0:0][0:0]amerge=inputs=8,pan=7.1|c0=c0|c1=c2|c2=c1|c3=c4|c4=c5|c5=c6|c6=c7|c7=c3|[mix];[mix]ebur128=peak=true" -f null - 

Bouke

> 
>> Failed to inject frame into filter network: Invalid argument
>> Error while processing the decoded data for stream #0:0
>> Conversion failed!
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