[FFmpeg-devel] [PATCH 3/5] audioconvert: implement av_bprint_channel_layout().

[Nicolas George]

L'octidi 18 prairial, an CCXX, Clément Bœsch a écrit :
> OK I did some random tests but it didn't work as smooth as I expected...
> 
> First I tried to generate a random sample with:
> 
>     ./ffmpeg -f lavfi -i "aevalsrc=sin(330*PI*2*t)[a];
>                           aevalsrc=sin(440*PI*2*t)[b];
>                           [a][b]amerge" -t 5 out.wav
> 
> But it crashed. Actually, it also crashes on master/HEAD.

Fixed by:
http://ffmpeg.org/pipermail/ffmpeg-devel/2012-June/125541.html

> So I created two samples with sth like:
> 
>     ./ffmpeg -f lavfi -i aevalsrc='sin(330*PI*2*t)' -t 5 ch0.wav
>              -f lavfi -i aevalsrc='sin(440*PI*2*t)' -t 5 ch1.wav
> 
> And then this:
> 
>     ./ffmpeg -i ch0.wav -i ch1.wav -filter_complex
>         '[0:0][1:0]amerge[out0];
>          [0:0][1:0]amerge[out1]' -map '[out0]'
>                                  -map '[out1]' -y out.ogg
> 
> This actually crashes after your patchset (master/HEAD + the 5 patches of
> this thread), but works with master/HEAD.

It works for me right now. Complete console output down below.

> With the previous out.ogg (generated from master/HEAD), in your amerge
> branch I tried this:
> 
>     ./ffmpeg -i out.ogg -filter_complex
>         '[0:0][0:1][1:0][1:1]amerge=inputs=4' -f null -
> 
> But it crashed again...

I get:

Invalid file index 1 in filtergraph description [0:0][0:1][1:0][1:1]amerge=inputs=4.

And indeed, your command line has only one input: 1:0 does not make sense.

> The only use case I'm interested is: take a video, and merge all the
> streams into one. This is assuming all the streams are mono, OR stereo
> pairs.

I am a little surprised here. I thought you wanted to implement -map_channel
with that.

Regards,

-- 
  Nicolas George


./ffmpeg -loglevel verbose -i /tmp/ch0.wav -i /tmp/ch1.wav -filter_complex '[0:0][1:0]amerge[out0]; [0:0][1:0]amerge[out1]' -map '[out0]' -map '[out1]' -y /tmp/out.ogg
ffmpeg version N-41358-gc57bb5b Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun  6 2012 16:18:18 with gcc 4.6.3
  configuration: --enable-shared --disable-static --enable-gpl --enable-libx264 --enable-libspeex --enable-libass --assert-level=1
  libavutil      51. 56.100 / 51. 56.100
  libavcodec     54. 25.100 / 54. 25.100
  libavformat    54.  6.101 / 54.  6.101
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 78.100 /  2. 78.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[wav @ 0xc9b100] parser not found for codec pcm_s16le, packets or times may be invalid.
Guessed Channel Layout for  Input Stream #0.0 : mono
Input #0, wav, from '/tmp/ch0.wav':
  Duration: 00:00:05.01, bitrate: 705 kb/s
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s
[wav @ 0xd030e0] parser not found for codec pcm_s16le, packets or times may be invalid.
Guessed Channel Layout for  Input Stream #1.0 : mono
Input #1, wav, from '/tmp/ch1.wav':
  Duration: 00:00:05.01, bitrate: 705 kb/s
    Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s
[0:0 @ 0xd86c00] tb:1/44100 samplefmt:s16 samplerate: 44100 ch layout:0x4
[1:0 @ 0xd86f40] tb:1/44100 samplefmt:s16 samplerate: 44100 ch layout:0x4
[0:0 @ 0xd8e9c0] tb:1/44100 samplefmt:s16 samplerate: 44100 ch layout:0x4
[1:0 @ 0xd1ea60] tb:1/44100 samplefmt:s16 samplerate: 44100 ch layout:0x4
[Parsed_amerge_0 @ 0xd26880] Inputs overlap: output layout will be meaningless
[Parsed_amerge_1 @ 0xd0ad20] Inputs overlap: output layout will be meaningless
[Parsed_amerge_0 @ 0xd26880] in0:mono + in1:mono -> out:stereo
[Parsed_amerge_1 @ 0xd0ad20] in0:mono + in1:mono -> out:stereo
Output #0, ogg, to '/tmp/out.ogg':
  Metadata:
    encoder         : Lavf54.6.101
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16, 128 kb/s
    Stream #0:1: Audio: flac, 44100 Hz, stereo, s16, 128 kb/s
Stream mapping:
  Stream #0:0 (pcm_s16le) -> amerge:
  Stream #0:0 (pcm_s16le) -> amerge:
  Stream #1:0 (pcm_s16le) -> amerge:
  Stream #1:0 (pcm_s16le) -> amerge:
  amerge -> Stream #0:0 (flac)
  amerge -> Stream #0:1 (flac)
Press [q] to stop, [?] for help
size=     194kB time=00:00:05.01 bitrate= 316.5kbits/s    
video:0kB audio:193kB global headers:0kB muxing overhead 0.595136%
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