[FFmpeg-user] creating dash multiple audio codecs

[James Northrup]

thank you so much!

opus wants -strict -2

it appears that stream copy is off the menu for filtered input, which is
actually a good thing to protect against codec mismatch as written.    it
is known to be 128k mp3 source content.

 ffmpeg -i 53f4cc2e686e87dc2004e0ed9669cb50.m4a -i
880f1ecd9c960940b077896915a3841c.m4a -i
aff159b2496019e9b714e6d6660d779c.m4a  -filter_complex
'concat=n=3:v=0:a=1:unsafe=1,asplit=3[out1][out2][out3]'  -nostdin -map
'[out1]' -c:a:0 copy    -map '[out2]'  -c:a:1 libfdk_aac -b:a:1 32k
-profile:a:1 aac_he_v2      -map '[out3]'   -c:a:2 opus -b:a:2 32k -strict
-2 -application voip  -frame_duration 60 -vbr off -compression_level 10
-packet_loss 0  -dash_segment_type mp4  x.mpd
ffmpeg version N-93335-ga8c5ae4 Copyright (c) 2000-2019 the FFmpeg
developers
  built with gcc 8 (Ubuntu 8.3.0-2ubuntu2)
  configuration: --prefix=/home/jim/ffmpeg_build
--pkg-config-flags=--static --extra-cflags=-I/home/jim/ffmpeg_build/include
--extra-ldflags=-L/home/jim/ffmpeg_build/lib --extra-libs='-lpthread -lm'
--bindir=/home/jim/bin --disable-ffplay --enable-bzlib --enable-ffmpeg
--enable-gpl --enable-iconv --enable-libfdk-aac --enable-libmp3lame
--enable-libopus --enable-libsnappy --enable-libssh --enable-nonfree
--enable-openssl --enable-version3 --enable-zlib --enable-libfreetype
--enable-libtwolame --enable-libvpx --enable-avresample --enable-librsvg
--enable-libx264 --enable-libvorbis --enable-libtheora --enable-libfreetype
--enable-libtwolame --enable-libvpx --enable-avresample --enable-librsvg
--enable-libx264 --enable-libvorbis --enable-libtheora --disable-shared
--enable-lto --enable-static
  libavutil      56. 26.100 / 56. 26.100
  libavcodec     58. 47.103 / 58. 47.103
  libavformat    58. 26.101 / 58. 26.101
  libavdevice    58.  6.101 / 58.  6.101
  libavfilter     7. 48.100 /  7. 48.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'53f4cc2e686e87dc2004e0ed9669cb50.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    encoder         : Lavf58.26.101
  Duration: 00:00:07.95, start: 0.000000, bitrate: 33 kb/s
    Stream #0:0(und): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 32 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from
'880f1ecd9c960940b077896915a3841c.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    date            : 2019-03-08 20:15
    encoder         : Lavf58.26.101
  Duration: 00:01:13.25, start: 0.000000, bitrate: 32 kb/s
    Stream #1:0(und): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 32 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from
'aff159b2496019e9b714e6d6660d779c.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    encoder         : Lavf58.26.101
  Duration: 00:00:08.02, start: 0.000000, bitrate: 33 kb/s
    Stream #2:0(und): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 32 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Streamcopy requested for output stream 0:0, which is fed from a complex
filtergraph. Filtering and streamcopy cannot be used together.


On Sat, Mar 16, 2019 at 8:37 AM Moritz Barsnick <barsnick at gmx.net> wrote:

> On Sat, Mar 16, 2019 at 01:25:49 +0100, Moritz Barsnick wrote:
> > What do you need "-strict -2" for? ffmpeg's aac codec hasn't required
> > that for over a year.
>
> Em, you're not even using ffmpeg's own aac encoder. so that comment
> doesn't apply there. Still, you likely don't need this. :-)
>
> Moritz
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