Re: [FFmpeg-user] Amerge trouble

[Paul B Mahol]

On 11/21/17, Erik Dobberkau  wrote:
>> And after that promote it to 24 bits again.
>> Is there a way to force the channel split to work in 24 bits?
>> (No idea how to squeeze pcm_s24le into the filter_complex part...)
>>
>
> A more knowledgeable person than myself would need to jump in here.
>
> When I use "aformat=sample_fmts=s24" at the beginning of the filterchain,
> this results in an error.

Because such sample format does not exist.
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Re: [FFmpeg-user] Amerge trouble

[Bouke / VideoToolShed]

> On 22 Nov 2017, at 06:32, Gyan Doshi  wrote:
> 
> 
> 
> On 11/19/2017 6:09 PM, Bouke / VideoToolShed wrote:
> 
>>> ffmpeg -i HD422.mxf -i 8ch.wav -c:v copy -c:a pcm_s24le -filter_complex \
>>> "[1:a]channelsplit=channel_layout=7.1[a0][a1][a2][a3][a4][a5][a6][a7],\
>>> [a1][0:a:1][a0][0:a:0][0:a:2]amerge=inputs=5[a]" \
>>> -map 0:v -map "[a]" -timecode 01:00:00:00 testmerge01.mxf \
>>> -map "[a2]" -map "[a3]" -map "[a4]" -map "[a5]" -map "[a6]" -map "[a7]" -f
>>> null -
> 
>> And after that promote it to 24 bits again.
>> Is there a way to force the channel split to work in 24 bits?
>> (No idea how to squeeze pcm_s24le into the filter_complex part…)
> 
> The default audio codec for the null muxer is pcm_s16le, and your audio codec 
> option is only set for the first output, so add '-c:a pcm_s24le' anywhere 
> after the output mxf filename, and before the pipe character.

Hi Gyan,
AH! Stupid me, now I see only the unused channels (that go down the drain) are 
16 bits :-)
Thanks!

Bouke



> 
> Regards,
> Gyan
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Re: [FFmpeg-user] Amerge trouble

[Gyan Doshi]

On 11/19/2017 6:09 PM, Bouke / VideoToolShed wrote:


ffmpeg -i HD422.mxf -i 8ch.wav -c:v copy -c:a pcm_s24le -filter_complex \
"[1:a]channelsplit=channel_layout=7.1[a0][a1][a2][a3][a4][a5][a6][a7],\
[a1][0:a:1][a0][0:a:0][0:a:2]amerge=inputs=5[a]" \
-map 0:v -map "[a]" -timecode 01:00:00:00 testmerge01.mxf \
-map "[a2]" -map "[a3]" -map "[a4]" -map "[a5]" -map "[a6]" -map "[a7]" -f
null -



And after that promote it to 24 bits again.
Is there a way to force the channel split to work in 24 bits?
(No idea how to squeeze pcm_s24le into the filter_complex part…)


The default audio codec for the null muxer is pcm_s16le, and your audio 
codec option is only set for the first output, so add '-c:a pcm_s24le' 
anywhere after the output mxf filename, and before the pipe character.



Regards,
Gyan
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Re: [FFmpeg-user] Amerge trouble

[Erik Dobberkau]

> And after that promote it to 24 bits again.
> Is there a way to force the channel split to work in 24 bits?
> (No idea how to squeeze pcm_s24le into the filter_complex part…)
>

A more knowledgeable person than myself would need to jump in here.

When I use "aformat=sample_fmts=s24" at the beginning of the filterchain,
this results in an error.
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Re: [FFmpeg-user] Amerge trouble

[Bouke / VideoToolShed]

On 18 Nov 2017, at 17:24, Erik Dobberkau  wrote:
> 
> or if you want a single audio stream with 5 channels:
> 
> ffmpeg -i HD422.mxf -i 8ch.wav -c:v copy -c:a pcm_s24le -filter_complex \
> "[1:a]channelsplit=channel_layout=7.1[a0][a1][a2][a3][a4][a5][a6][a7],\
> [a1][0:a:1][a0][0:a:0][0:a:2]amerge=inputs=5[a]" \
> -map 0:v -map "[a]" -timecode 01:00:00:00 testmerge01.mxf \
> -map "[a2]" -map "[a3]" -map "[a4]" -map "[a5]" -map "[a6]" -map "[a7]" -f
> null -

Hi Eric,
Great (I would never have come up with the way of disposing unwanted channels.)
One problem though, It seems that FFmpeg pipes the channel split, but does so 
in 16 bits:

  Stream #1:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 7.1, s32 (24 
bit), 9216 kb/s
Stream mapping:
  Stream #0:1 (pcm_s24le) -> amerge:in3
  Stream #0:2 (pcm_s24le) -> amerge:in1
  Stream #0:3 (pcm_s24le) -> amerge:in4
  Stream #1:0 (pcm_s24le) -> channelsplit
  Stream #0:0 -> #0:0 (copy)
  amerge -> Stream #0:1 (pcm_s24le)
  channelsplit:FC -> Stream #1:0 (pcm_s16le)
  channelsplit:LFE -> Stream #1:1 (pcm_s16le)
  channelsplit:BL -> Stream #1:2 (pcm_s16le)
  channelsplit:BR -> Stream #1:3 (pcm_s16le)
  channelsplit:SL -> Stream #1:4 (pcm_s16le)
  channelsplit:SR -> Stream #1:5 (pcm_s16le)

And after that promote it to 24 bits again.
Is there a way to force the channel split to work in 24 bits?
(No idea how to squeeze pcm_s24le into the filter_complex part…)

Bouke



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Re: [FFmpeg-user] Amerge trouble

[Erik Dobberkau]

or if you want a single audio stream with 5 channels:

ffmpeg -i HD422.mxf -i 8ch.wav -c:v copy -c:a pcm_s24le -filter_complex \
"[1:a]channelsplit=channel_layout=7.1[a0][a1][a2][a3][a4][a5][a6][a7],\
[a1][0:a:1][a0][0:a:0][0:a:2]amerge=inputs=5[a]" \
-map 0:v -map "[a]" -timecode 01:00:00:00 testmerge01.mxf \
-map "[a2]" -map "[a3]" -map "[a4]" -map "[a5]" -map "[a6]" -map "[a7]" -f
null -
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Re: [FFmpeg-user] Amerge trouble

[Erik Dobberkau]

This works as intended:

ffmpeg -i HD422.mxf -i 8ch.wav -c:v copy -c:a pcm_s24le -filter_complex \
"[1:a]channelsplit=channel_layout=7.1[a0][a1][a2][a3][a4][a5][a6][a7]" \
-map 0:v -map "[a1]" -map 0:a:1 -map "[a0]" -map 0:a:0 -map 0:a:2 \
-timecode 01:00:00:00 testmerge00.mxf -map "[a2]" \
-map "[a3]" -map "[a4]" -map "[a5]" -map "[a6]" -map "[a7]" -f null -
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Re: [FFmpeg-user] Amerge trouble

[Erik Dobberkau]

2017-11-18 15:12 GMT+01:00 Bouke / VideoToolShed :

> Hi guys,
> Trying to do some audio patching from multiple input files, and output a
> QT or MXF with a poly soundtrack.
> Now this turns out to be a hell of a job, I can’t grasp the logic on how
> the patching works.
>
> Y\LTC_Convert\FF\ffmpeg -threads 1 -i V\!patch\test.mxf -ss 0. -i
> V\!patch\snd.wav -map 0:0 -filter_complex "[1:a][0:a:2][1:a][0:a:1][0:a:
> 3]amerge=inputs=5,pan=5c|c0=c9|c1=c1|c2=c8|c3=c0|c4=c2[a]" -map "[a]" -ca
> pcm_s24le -cv copy -timecode 01:00:00:00 -y V\!patch\active\test.mxf"
>
> FFmpeg returns:
> Stream mapping:
>   Stream #0:2 (pcm_s24le) -> amerge:in3
>   Stream #0:3 (pcm_s24le) -> amerge:in1
>   Stream #0:4 (pcm_s24le) -> amerge:in4
>   Stream #1:0 (pcm_s24le) -> amerge:in0
>   Stream #1:0 (pcm_s24le) -> amerge:in2
>
> This looks all good, so the problem must be in how I define the pan, but
> for the life of me I can’t understand how the numbers work.
> It seems (by other tests) that the input track up numbers based on what is
> already set, but it’s still erratic..
>
> I would expect to get (output = from input file)
> sndTrack 0 = snd.wav 2
> sndTrack 1 = test.mxf 2
> sndTrack 2 = snd.wav 1
> sndTrack 3 = test.mxf 1
> sndTrack 4 = test.mxf 3
>
> but, the result has channels mapped as
> sndTrack 0 = snd.wav 1
> sndTrack 1 = snd.wav 2
> sndTrack 2 = test.mxf 3
> sndTrack 3 = snd.wav 1
> sndTrack 4 = snd.wav 3
>
> Isn’t there a simple way to set the patching? Or, where is my logic off?
>
>
Hi Bouke,

I would have thought

-filter_complex "[1:a:1][0:a:1][1:a:0][0:a:0][0:a:2]amerge=inputs=5"

would get you what you want.

-filter_complex "[1:1][0:a:1][1:0][0:a:0][0:a:2]amerge=inputs=5"

should also work, as well as

-filter_complex "[1:1][0:2][1:0][0:1][0:3]amerge=inputs=5"

No pan filter required, if you require one output stream with 5 audio
channels.

If you specifiy audio by using "a", you need to start counting from zero.
If you omit "a", the stream number depends on the arrangement of streams in
the file.


Best regards,
Erik
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Re: [FFmpeg-user] Amerge trouble

[Gyan Doshi]

On 11/18/2017 7:42 PM, Bouke / VideoToolShed wrote:


Stream mapping:
   Stream #0:2 (pcm_s24le) -> amerge:in3
   Stream #0:3 (pcm_s24le) -> amerge:in1
   Stream #0:4 (pcm_s24le) -> amerge:in4
   Stream #1:0 (pcm_s24le) -> amerge:in0
   Stream #1:0 (pcm_s24le) -> amerge:in2

but, the result has channels mapped as
sndTrack 0 = snd.wav 1
sndTrack 1 = snd.wav 2
sndTrack 2 = test.mxf 3
sndTrack 3 = snd.wav 1
sndTrack 4 = snd.wav 3


It's as expected. amerge output channel order, in this case, will be the 
channels laid out in input order ( [1:a][0:a:2][1:a][0:a:1][0:a:3] ) 
i.e. all channels of [1:a], followed by [0:a:2], followed by a repeat of 
[1:a] and so on.


Regards,
Gyan
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