Hello,
using the option "aresample=matrix_encoding=dplii" I would expect the output to
be 2 channels with dolby pro logic encoding, but this seems not to be the case?!
=======================================================
ffmpeg -i 5.1\ Dolby\ Surround\ Test-PqVCPE8_ntE.mkv -vcodec copy -af
aresample=matrix_encoding=dplii -acodec ac3 -ab 256k aresample_test.mkv
ffmpeg version n4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.2.1 (GCC) 20181127
configuration: --prefix=/usr --disable-debug --disable-static
--disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls
--enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray
--enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm
--enable-libiec61883 --enable-libjack --enable-libmodplug --enable-libmp3lame
--enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg
--enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex
--enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid
--enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
--enable-libzvbi --enable-libmysofa
libavutil 56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat 58. 20.100 / 58. 20.100
libavdevice 58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc 55. 3.100 / 55. 3.100
Input #0, matroska,webm, from '5.1 Dolby Surround Test-PqVCPE8_ntE.mkv':
Metadata:
ENCODER : Lavf58.20.100
Duration: 00:01:22.05, start: 0.000000, bitrate: 1028 kb/s
Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 1920x1080,
SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
Metadata:
DURATION : 00:01:21.748000000
Stream #0:1: Audio: aac (LC), 48000 Hz, 5.1, fltp (default)
Metadata:
HANDLER_NAME : SoundHandler
DURATION : 00:01:22.048000000
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (aac (native) -> ac3 (native))
Press [q] to stop, [?] for help
Output #0, matroska, to 'aresample_test.mkv':
Metadata:
encoder : Lavf58.20.100
Stream #0:0(eng): Video: vp9 (Profile 0) (VP90 / 0x30395056), yuv420p(tv,
bt709), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 29.97 tbr, 1k tbn, 1k
tbc (default)
Metadata:
DURATION : 00:01:21.748000000
Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1, fltp, 256
kb/s (default)
Metadata:
HANDLER_NAME : SoundHandler
DURATION : 00:01:22.048000000
encoder : Lavc58.35.100 ac3
frame= 2450 fps=0.0 q=-1.0 Lsize= 9012kB time=00:01:22.04 bitrate=
899.9kbits/s speed= 151x
video:6413kB audio:2564kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.398834%
===============================
Probing the output:
=============================
ffprobe aresample_test.mkv ffprobe version n4.1.1 Copyright (c) 2007-2019 the
FFmpeg developers
built with gcc 8.2.1 (GCC) 20181127
configuration: --prefix=/usr --disable-debug --disable-static
--disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls
--enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray
--enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm
--enable-libiec61883 --enable-libjack --enable-libmodplug --enable-libmp3lame
--enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg
--enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex
--enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid
--enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
--enable-libzvbi --enable-libmysofa
libavutil 56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat 58. 20.100 / 58. 20.100
libavdevice 58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc 55. 3.100 / 55. 3.100
Input #0, matroska,webm, from 'aresample_test.mkv':
Metadata:
ENCODER : Lavf58.20.100
Duration: 00:01:22.05, start: 0.000000, bitrate: 899 kb/s
Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 1920x1080,
SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
Metadata:
DURATION : 00:01:21.753000000
Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 256 kb/s (default)
Metadata:
HANDLER_NAME : SoundHandler
ENCODER : Lavc58.35.100 ac3
DURATION : 00:01:22.048000000
=====================================
The audio stays to has 5.1 channels?!
Kind regards
Bernd B.
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