[FFmpeg-user] issue with trim & pan filters

[Paul B Mahol]

On 12/30/15, Christian Johannesen <chrisjohannesen at gmail.com> wrote:
> I ran into an issue with ffmpeg tonight where I could not trim a source
> because of the audio channel configuration of the track I was pulling audio
> from. The source has a track of 12 channels of audio. I can process the
> first two channels in the track to a stereo output with the pan filter. If
> I apply a trim to the input - the trim for input stream complains that it
> cannot select the channel layout for the link between the filters trim and
> the Parsed_pan_0. I have tried adding -guess_layout_max 0 before the input,
> and have tried
> setting aformat=channel_layouts=FC+FC+FC+FC+FC+FC+FC+FC+FC+FC+FC+FC without
> success.
>
> Any suggestions would be appreciated.
>
> Thanks,
> Chris
>
>>ffmpeg.exe -r 24000/1001 -ss 00:00:06.256 -t 00:00:20.771 -i
> d:\media\1080p2398_timecode_12ch_multitrack.mov -filter_complex
> "[0:1]pan=2c|c0=c0c1=c1[pan_0_0]" -map 0:0 -map "[pan_0_0]" -c:v libx264
> -c:a aac -shortest d:\media\1080p2398_timecode_clip_stereo.mp4
> ffmpeg version N-77528-gf88546b Copyright (c) 2000-2015 the FFmpeg
> developers
>   built with gcc 5.2.0 (GCC)
>   configuration: --enable-gpl --enable-nonfree --enable-libx264
> --enable-libx265 --enable-libfdk_aac --enable-static --disable-shared
> --enable-libfreetype --enable-libfontconfig
>   libavutil      55. 11.100 / 55. 11.100
>   libavcodec     57. 20.100 / 57. 20.100
>   libavformat    57. 21.100 / 57. 21.100
>   libavdevice    57.  0.100 / 57.  0.100
>   libavfilter     6. 22.100 /  6. 22.100
>   libswscale      4.  0.100 /  4.  0.100
>   libswresample   2.  0.101 /  2.  0.101
>   libpostproc    54.  0.100 / 54.  0.100
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
> 'd:\media\1080p2398_timecode_12ch_multitrack.mov':
>   Metadata:
>     major_brand     : qt
>     minor_version   : 537199360
>     compatible_brands: qt
>     creation_time   : 2015-12-30 03:50:57
>     com.apple.quicktime.player.version: 7.6.9 (Dev)
>     com.apple.quicktime.version: 7.6.9 (1680.9)
>     com.apple.quicktime.player.movie.audio.gain: 1.000000
>     com.apple.quicktime.player.movie.audio.treble: 0.000000
>     com.apple.quicktime.player.movie.audio.bass: 0.000000
>     com.apple.quicktime.player.movie.audio.balance: 0.000000
>     com.apple.quicktime.player.movie.audio.pitchshift: 0.000000
>     com.apple.quicktime.player.movie.audio.mute:
>     com.apple.quicktime.player.movie.visual.brightness: 0.000000
>     com.apple.quicktime.player.movie.visual.color: 1.000000
>     com.apple.quicktime.player.movie.visual.tint: 0.000000
>     com.apple.quicktime.player.movie.visual.contrast: 1.000000
>   Duration: 00:00:27.07, start: 0.000000, bitrate: 29785 kb/s
>     Stream #0:0(eng): Video: prores (apcs / 0x73637061),
> yuv422p10le(bt709), 1920x1080, 15958 kb/s, SAR 1:1 DAR 16:9, 23.98 fps,
> 23.98 tbr, 24k tbn, 24k tbc (default)
>     Metadata:
>       creation_time   : 2015-12-30 03:50:57
>       handler_name    : Apple Alias Data Handler
>       encoder         : Apple ProRes 422 (LT)
>       timecode        : 00:59:45:00
>     Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 12
> channels, s32 (24 bit), 13824 kb/s (default)
>     Metadata:
>       creation_time   : 2015-12-30 03:50:57
>       handler_name    : Apple Alias Data Handler
>       timecode        : 00:59:45:00
>     Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
>     Metadata:
>       creation_time   : 2015-12-30 03:50:57
>       handler_name    : Apple Alias Data Handler
>       timecode        : 00:59:45:00
> [trim for input stream 0:1 @ 000000ecd74caac0] Cannot select channel layout
> for the link between filters trim for input stream 0:1 and Parsed_pan_0.
> [trim for input stream 0:1 @ 000000ecd74caac0] Unknown channel layouts not
> supported, try specifying a channel layout using
> 'aformat=channel_layouts=something'.
> Error configuring complex filters.
> Invalid argument
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Looks like bug in atrim filter, I will post patch for it.