ffmpeg - 具有非标准通道布局的 ffmpeg 耳机卷积音频滤波器

Question

我成功地使用了 ffmpeg 的耳机卷积音频过滤器（请参阅 ffmpeg 过滤器文档第 8.78 节）来制作多达 16 个声道的双耳版本的环绕声。只要通道布局被 ffmpeg 识别。

我在一个文件中有 32 个 IR（16 个立体声对），可用于：

立体声 5.1、7.1 和 7.1.4.4（16 通道）。

IR 文件中对的顺序为：

FL|FR|FC|LFE|BL|BR|SL|SR|FLC|FRC|TFL|TFR|BC|TC|TBL|TBR

所以所有这些格式都是 IR 文件的子集，并且是按顺序排列的。

具有超过 8 个通道的环绕声输入文件在其标题中通过先前应用的 ffmpeg 命令分配了通道。

如：

ffmpeg.exe" -y -i %%x -acodec pcm_s24le  -af "pan=7.1+TFL+TFR+TBL+TBR|FL=c0|FR=c1|FC=c2|LFE=c3|SL=c6|SR=c7|BL=c4|BR=c5|TFL=c8|TFR=c9|TBL=c10|TBR=c11" "%%~nx_12ch_mapped.wav"

对于 12 个通道和：

ffmpeg.exe" -y -i %%x -acodec pcm_s24le -filter_complex "pan=FL+FR+FC+LFE+BL+BR+SL+SR+FLC+FRC+TFL+TFR+BC+TC+TBL+TBR|FL=c0|FR=c1|FC=c2|LFE=c3|BL=c4|BR=c5|SL=c6|SR=c7|FLC=c8|FRC=c9|TFL=c10|TFR=c11|BC=c12|TC=c13|TBL=c14|TBR=c15" "%%~nx_16ch_mapped.wav"

16 个通道。

所以这是一个有效的卷积命令。它同样适用于立体声、5.1、7.1 和 16 声道环绕输入文件（只有增益需要针对不同的声道​​数输入进行更改）：

ffmpeg.exe" -hide_banner -y -i "%%~nx_48KHz.wav" -i "%parent%\My-IR.wav" -filter_complex "[1:0]pan=stereo|c0=c0|c1=c1[fl];[1:0]pan=stereo|c0=c2|c1=c3[fr];[1:0]pan=stereo|c0=c4|c1=c5[fc];[1:0]pan=stereo|c0=c6|c1=c7[lfe];[1:0]pan=stereo|c0=c8|c1=c9[bl];[1:0]pan=stereo|c0=c10|c1=c11[br];[1:0]pan=stereo|c0=c12|c1=c13[sl];[1:0]pan=stereo|c0=c14|c1=c15[sr];[1:0]pan=stereo|c0=c16|c1=c17[flc];[1:0]pan=stereo|c0=c18|c1=c19[frc];[1:0]pan=stereo|c0=c20|c1=c21[tfl];[1:0]pan=stereo|c0=c22|c1=c23[tfr];[1:0]pan=stereo|c0=c24|c1=c25[bc];[1:0]pan=stereo|c0=c26|c1=c27[tc];[1:0]pan=stereo|c0=c28|c1=c29[tbl];[1:0]pan=stereo|c0=c30|c1=c31[tbr];[0:a][fl][fr][fc][lfe][bl][br][sl][sr][flc][frc][tfl][tfr][bc][tc][tbl][tbr]headphone=gain=32:map=FL|FR|FC|LFE|BL|BR|SL|SR|FLC|FRC|TFL|TFR|BC|TC|TBL|TBR[fh]" -map [fh]:a  "%%~nx_h_binaural.flac"

这给出了结果：

Guessed Channel Layout for Input Stream #0.0 : hexadecagonal
Input #0, wav, from 'Black Hole Sun_7.1.4.4_16ch_mapped_48KHz.wav':
  Duration: 00:05:19.19, bitrate: 24576 kb/s
    Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, hexadecagonal, flt, 24576 kb/s
Input #1, wav, from 'D:\Google Drive\16ch Virtual_Surround\\My-IR.wav':
  Duration: 00:00:01.00, bitrate: 49194 kb/s
    Stream #1:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 32 channels, flt, 49152 kb/s
Stream mapping:
  Stream #0:0 (pcm_f32le) -> headphone:in0
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  headphone -> Stream #0:0 (flac)
Press [q] to stop, [?] for help
[Parsed_pan_0 @ 000001c26da4b180] Pure channel mapping detected: 0 1
[Parsed_pan_1 @ 000001c26da4b680] Pure channel mapping detected: 2 3
[Parsed_pan_2 @ 000001c26da4b780] Pure channel mapping detected: 4 5
[Parsed_pan_3 @ 000001c26da4bc80] Pure channel mapping detected: 6 7
[Parsed_pan_4 @ 000001c26da4ab80] Pure channel mapping detected: 8 9
[Parsed_pan_5 @ 000001c26da4b280] Pure channel mapping detected: 10 11
[Parsed_pan_6 @ 000001c26da4a280] Pure channel mapping detected: 12 13
[Parsed_pan_7 @ 000001c26da4b980] Pure channel mapping detected: 14 15
[Parsed_pan_8 @ 000001c26da4af80] Pure channel mapping detected: 16 17
[Parsed_pan_9 @ 000001c26da4b880] Pure channel mapping detected: 18 19
[Parsed_pan_10 @ 000001c26da4b080] Pure channel mapping detected: 20 21
[Parsed_pan_11 @ 000001c26da4be80] Pure channel mapping detected: 22 23
[Parsed_pan_12 @ 000001c26da4ba80] Pure channel mapping detected: 24 25
[Parsed_pan_13 @ 000001c26da4a180] Pure channel mapping detected: 26 27
[Parsed_pan_14 @ 000001c26da4b380] Pure channel mapping detected: 28 29
[Parsed_pan_15 @ 000001c26da4a580] Pure channel mapping detected: 30 31
[flac @ 000001c26d605440] encoding as 24 bits-per-sample
Output #0, flac, to 'Black Hole Sun_7.1.4.4_16ch_mapped_h_binaural.flac':
  Metadata:
    encoder         : Lavf58.33.100
    Stream #0:0: Audio: flac, 48000 Hz, stereo, s32 (24 bit), 128 kb/s (default)
    Metadata:
      encoder         : Lavc58.59.102 flac
size=   64546kB time=00:05:19.18 bitrate=1656.6kbits/s speed=3.12x
video:0kB audio:64538kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.012541%

但是对于需要跳过某些 IR 的通道布局，例如 4.0、5.0 和 7.1.4（12 个通道），我不知道如何使其工作。在 12 通道的情况下，我什至将 IR 文件减少到 24 通道（12 对）并尝试了这个：

ffmpeg.exe" -hide_banner -y -i "%%~nx_48KHz.wav" -i "%parent%\IR-Files\A16_12ch_IR 12_Pairs_A16_Order.wav" -filter_complex "[1:0]pan=stereo|c0=c0|c1=c1[fl];[1:0]pan=stereo|c0=c2|c1=c3[fr];[1:0]pan=stereo|c0=c4|c1=c5[fc];[1:0]pan=stereo|c0=c6|c1=c7[lfe];[1:0]pan=stereo|c0=c8|c1=c9[bl];[1:0]pan=stereo|c0=c10|c1=c11[br];[1:0]pan=stereo|c0=c12|c1=c13[sl];[1:0]pan=stereo|c0=c14|c1=c15[sr];[1:0]pan=stereo|c0=c16|c1=c17[tfl];[1:0]pan=stereo|c0=c18|c1=c19[tfr];[1:0]pan=stereo|c0=c20|c1=c21[tbl];[1:0]pan=stereo|c0=c22|c1=c23[tbr];[0:a][fl][fr][fc][lfe][bl][br][sl][sr][tfl][tfr][tbl][tbr]headphone=gain=10:map=FL|FR|FC|LFE|BL|BR|SL|SR|TFL|TFR|TBL|TBR[fh]" -map [fh]:a  "%%~nx_h_binaural.flac"

但它给出了以下输出：

Input #0, wav, from 'Mistral Wind m_12ch_mapped norm 0dB_48KHz.wav':
  Duration: 00:07:26.43, bitrate: 18432 kb/s
    Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 12 channels, flt, 18432 kb/s
Input #1, wav, from 'D:\Google Drive\16ch Virtual_Surround\\IR-Files\A16_12ch_IR 12_Pairs_A16_Order.wav':
  Duration: 00:00:01.00, bitrate: 36866 kb/s
    Stream #1:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 24 channels, flt, 36864 kb/s
Stream mapping:
  Stream #0:0 (pcm_f32le) -> headphone:in0
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  Stream #1:0 (pcm_f32le) -> pan
  headphone -> Stream #0:0 (flac)
Press [q] to stop, [?] for help
[auto_resampler_0 @ 000002a4ffb4f980] Cannot select channel layout for the link between filters auto_resampler_0 and Parsed_headphone_12.
[auto_resampler_0 @ 000002a4ffb4f980] Unknown channel layouts not supported, try specifying a channel layout using 'aformat=channel_layouts=something'.
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!

而且我不知道将建议的 aformat=channel_layouts=something 放在哪里。

建议？

标签： ffmpegconvolutionheadphones