> On 02 May 2018, at 16:20, Moritz Barsnick <[email protected]> wrote: > > On Wed, May 02, 2018 at 15:51:09 +0200, Bouke / VideoToolShed wrote: >> Strange thing, more than 8 channels give silent output: >> ffmpeg -i 9Ch_orMore.WAV -filter_complex "[0:0][0:0] >> amix=inputs=2,pan=mono|c0=c0+c1” -ac 1 mono.wav >> gives on errors whatsoever, but output is silent. > > "No" errors? Hi Moritz: Boukes-portable:~ bouke$ /Volumes/Leo/Tim/ffmpeg -i /Volumes/Leo/Tim/9chan.wav -filter_complex '[0:0][0:0]amix=inputs=2,pan=mono|c0=c0+c1,volumedetect' -t 5 -f null - ffmpeg version 3.3-tessus Copyright (c) 2000-2017 the FFmpeg developers built with Apple LLVM version 8.0.0 (clang-800.0.42.1) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-libzvbi --enable-version3 --disable-ffplay --disable-indev=qtkit libavutil 55. 58.100 / 55. 58.100 libavcodec 57. 89.100 / 57. 89.100 libavformat 57. 71.100 / 57. 71.100 libavdevice 57. 6.100 / 57. 6.100 libavfilter 6. 82.100 / 6. 82.100 libswscale 4. 6.100 / 4. 6.100 libswresample 2. 7.100 / 2. 7.100 libpostproc 54. 5.100 / 54. 5.100 Input #0, wav, from '/Volumes/Leo/Tim/9chan.wav': Metadata: comment : 9chan.wav encoded_by : Avid Media Composer 8.6.1 originator_reference: 000000000000002a5ae9870f0645a69b date : 2018-05-02 creation_time : 11-39-48 time_reference : 172800000 coding_history : PCM MODE:STEREO SAMPLE_RATE:48000 BITS_PER_SAMP:24 : DIGITIZE CARD:DeckLink Studio 2 & 1394 Audio & DirectSound Audio PERIPHERAL:DeckLink Studio 2 & Avid OHCI : Duration: 00:00:15.04, bitrate: 10368 kb/s Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 9 channels, s32 (24 bit), 10368 kb/s [Parsed_volumedetect_2 @ 0x7fa64b522cc0] n_samples: 0 Stream mapping: Stream #0:0 (pcm_s24le) -> amix:input0 Stream #0:0 (pcm_s24le) -> amix:input1 volumedetect -> Stream #0:0 (pcm_s16le) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: comment : 9chan.wav encoded_by : Avid Media Composer 8.6.1 originator_reference: 000000000000002a5ae9870f0645a69b date : 2018-05-02 coding_history : PCM MODE:STEREO SAMPLE_RATE:48000 BITS_PER_SAMP:24 : DIGITIZE CARD:DeckLink Studio 2 & 1394 Audio & DirectSound Audio PERIPHERAL:DeckLink Studio 2 & Avid OHCI : time_reference : 172800000 encoder : Lavf57.71.100 Stream #0:0: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s (default) Metadata: encoder : Lavc57.89.100 pcm_s16le size=N/A time=00:00:05.00 bitrate=N/A speed=2.86x video:0kB audio:469kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown [Parsed_volumedetect_2 @ 0x7fa64b702360] n_samples: 240241 [Parsed_volumedetect_2 @ 0x7fa64b702360] mean_volume: -91.0 dB [Parsed_volumedetect_2 @ 0x7fa64b702360] max_volume: -91.0 dB [Parsed_volumedetect_2 @ 0x7fa64b702360] histogram_91db: 240241 Thus, silence. Same with a 4 channel file (same content on ch. 1 to 4) Boukes-portable:~ bouke$ /Volumes/Leo/Tim/ffmpeg -i /Volumes/Leo/Tim/4chan.wav -filter_complex '[0:0][0:0]amix=inputs=2,pan=mono|c0=c0+c1,volumedetect' -t 5 -f null - ffmpeg version 3.3-tessus Copyright (c) 2000-2017 the FFmpeg developers built with Apple LLVM version 8.0.0 (clang-800.0.42.1) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-libzvbi --enable-version3 --disable-ffplay --disable-indev=qtkit libavutil 55. 58.100 / 55. 58.100 libavcodec 57. 89.100 / 57. 89.100 libavformat 57. 71.100 / 57. 71.100 libavdevice 57. 6.100 / 57. 6.100 libavfilter 6. 82.100 / 6. 82.100 libswscale 4. 6.100 / 4. 6.100 libswresample 2. 7.100 / 2. 7.100 libpostproc 54. 5.100 / 54. 5.100 Guessed Channel Layout for Input Stream #0.0 : 4.0 Input #0, wav, from '/Volumes/Leo/Tim/4chan.wav': Metadata: comment : 4chan.wav encoded_by : Avid Media Composer 8.6.1 originator_reference: 000000000000002a5ae9872706460222 date : 2018-05-02 creation_time : 11-40-12 time_reference : 172800000 coding_history : PCM MODE:STEREO SAMPLE_RATE:48000 BITS_PER_SAMP:24 : DIGITIZE CARD:DeckLink Studio 2 & 1394 Audio & DirectSound Audio PERIPHERAL:DeckLink Studio 2 & Avid OHCI : Duration: 00:00:15.04, bitrate: 4608 kb/s Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 4.0, s32 (24 bit), 4608 kb/s [Parsed_volumedetect_2 @ 0x7fed73421460] n_samples: 0 Stream mapping: Stream #0:0 (pcm_s24le) -> amix:input0 Stream #0:0 (pcm_s24le) -> amix:input1 volumedetect -> Stream #0:0 (pcm_s16le) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: comment : 4chan.wav encoded_by : Avid Media Composer 8.6.1 originator_reference: 000000000000002a5ae9872706460222 date : 2018-05-02 coding_history : PCM MODE:STEREO SAMPLE_RATE:48000 BITS_PER_SAMP:24 : DIGITIZE CARD:DeckLink Studio 2 & 1394 Audio & DirectSound Audio PERIPHERAL:DeckLink Studio 2 & Avid OHCI : time_reference : 172800000 encoder : Lavf57.71.100 Stream #0:0: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s (default) Metadata: encoder : Lavc57.89.100 pcm_s16le size=N/A time=00:00:05.00 bitrate=N/A speed=6.08x video:0kB audio:469kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown [Parsed_volumedetect_2 @ 0x7fed73605840] n_samples: 240405 [Parsed_volumedetect_2 @ 0x7fed73605840] mean_volume: -26.8 dB [Parsed_volumedetect_2 @ 0x7fed73605840] max_volume: -11.4 dB [Parsed_volumedetect_2 @ 0x7fed73605840] histogram_11db: 18 [Parsed_volumedetect_2 @ 0x7fed73605840] histogram_12db: 75 [Parsed_volumedetect_2 @ 0x7fed73605840] histogram_13db: 184 But, when I swap Amix with Amerge, all is well also with 9 channels… I don’t understand it, but it’s good enough for rock ’n roll. Thanks all! Bouke > > This works for me (9 inputs): > $ ffmpeg -f lavfi -i anoisesrc=seed=0 -f lavfi -i anoisesrc=seed=1 -f lavfi > -i anoisesrc=seed=2 -f lavfi -i anoisesrc=seed=3 -f lavfi -i anoisesrc=seed=4 > -f lavfi -i anoisesrc=seed=5 -f lavfi -i anoisesrc=seed=6 -f lavfi -i > anoisesrc=seed=7 -f lavfi -i anoisesrc=seed=8 -filter_complex > 'amerge=inputs=9,pan=mono|c0=c0+c1,volumedetect' -t 5 -f null - > > (volumedetect is there to verify that it is not silent.) > > What are you trying to achieve with amix? > > Moritz > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe".
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