creating dash multiple audio codecs

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creating dash multiple audio codecs

James Northrup
i'm trying to automate bumpers with audio content and supply dash in one
stroke.  the concat and split seem to be exactly like the sample code
promises.

my understanding is that dash is a format, so i can include multiple tracks
or programs in one container.  what happens appears to be 3 opus instead of
aac(orig)/aac(HE)/opus based on browser codec pref+bandwidth

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 copy   \
-map '[out2]' -c:a libfdk_aac -b:a 32k -profile:a aac_he_v2 -map 1:a \
-map '[out3]' -c:a opus -b:a 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
Codec AVOption packet_loss (Expected packet loss percentage) specified for
output file #0 (x.mpd) has not been used for any stream. The most likely
reason is either wrong type (e.g. a video option with no video streams) or
that it is a private option of some encoder which was not actually used for
any stream.
Codec AVOption application (Intended application type) specified for output
file #0 (x.mpd) has not been used for any stream. The most likely reason is
either wrong type (e.g. a video option with no video streams) or that it is
a private option of some encoder which was not actually used for any stream.
Codec AVOption frame_duration (Duration of a frame in milliseconds)
specified for output file #0 (x.mpd) has not been used for any stream. The
most likely reason is either wrong type (e.g. a video option with no video
streams) or that it is a private option of some encoder which was not
actually used for any stream.
Codec AVOption vbr (VBR mode (1-5)) specified for output file #0 (x.mpd)
has not been used for any stream. The most likely reason is either wrong
type (e.g. a video option with no video streams) or that it is a private
option of some encoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 (aac) -> concat:in0:a0 (graph 0)
  Stream #1:0 (aac) -> concat:in1:a0 (graph 0)
  Stream #2:0 (aac) -> concat:in2:a0 (graph 0)
  asplit:output0 (graph 0) -> Stream #0:0 (opus)
  asplit:output1 (graph 0) -> Stream #0:1 (opus)
  Stream #1:0 -> #0:2 (aac (native) -> opus (native))
  asplit:output2 (graph 0) -> Stream #0:3 (opus)
[dash @ 0x55d4f4058900] Opening 'init-stream0.mp4' for writing
[dash @ 0x55d4f4058900] Opening 'init-stream1.mp4' for writing
[dash @ 0x55d4f4058900] Opening 'init-stream2.mp4' for writing
[dash @ 0x55d4f4058900] Opening 'init-stream3.mp4' for writing
Output #0, dash, to 'x.mpd':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    encoder         : Lavf58.26.101
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp, 32 kb/s
    Metadata:
      encoder         : Lavc58.47.103 opus
    Stream #0:1: Audio: opus, 48000 Hz, stereo, fltp, 32 kb/s
    Metadata:
      encoder         : Lavc58.47.103 opus
    Stream #0:2(und): Audio: opus, 48000 Hz, stereo, fltp, 32 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc58.47.103 opus
    Stream #0:3: Audio: opus, 48000 Hz, stereo, fltp, 32 kb/s
    Metadata:
      encoder         : Lavc58.47.103 opus
[dash @ 0x55d4f4058900] Opening 'chunk-stream0-00001.mp4.tmp' for writing
[dash @ 0x55d4f4058900] Opening 'chunk-stream1-00001.mp4.tmp' for writing
[dash @ 0x55d4f4058900] Opening 'chunk-stream2-00001.mp4.tmp' for writing
[dash @ 0x55d4f4058900] Opening 'chunk-stream3-00001.mp4.tmp' for writing
[dash @ 0x55d4f4058900] Opening 'x.mpd.tmp' for writing
[...]
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Re: creating dash multiple audio codecs

Moritz Barsnick
Hi James,

On Sat, Mar 16, 2019 at 04:12:22 +0800, James Northrup wrote:

> my understanding is that dash is a format, so i can include multiple tracks
> or programs in one container.  what happens appears to be 3 opus instead of
> aac(orig)/aac(HE)/opus based on browser codec pref+bandwidth
>
> 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 copy   \
> -map '[out2]' -c:a libfdk_aac -b:a 32k -profile:a aac_he_v2 -map 1:a \
> -map '[out3]' -c:a opus -b:a 32k -strict -2 -application voip
>  -frame_duration 60 -vbr off -compression_level 10  -packet_loss 0  \
> -dash_segment_type mp4  x.mpd
[...]
> Stream mapping:
>   Stream #0:0 (aac) -> concat:in0:a0 (graph 0)
>   Stream #1:0 (aac) -> concat:in1:a0 (graph 0)
>   Stream #2:0 (aac) -> concat:in2:a0 (graph 0)
>   asplit:output0 (graph 0) -> Stream #0:0 (opus)
>   asplit:output1 (graph 0) -> Stream #0:1 (opus)
>   Stream #1:0 -> #0:2 (aac (native) -> opus (native))
>   asplit:output2 (graph 0) -> Stream #0:3 (opus)

You need to realize that your "-c:a" options apply to a complete output
(x.mpd), so the third one is overwriting the first and the second (and
only one output follows - obviously).

If you want to apply different options to different streams within one
output, you need to use "-c:a:0", "-c:a:1", "-c:a:2". I also recommend
the stream specifier suffixes for the other options which are using
":a".

This and the following warnings should have given it away:
> Codec AVOption packet_loss (Expected packet loss percentage) specified for
> output file #0 (x.mpd) has not been used for any stream. The most likely
> reason is either wrong type (e.g. a video option with no video streams) or
> that it is a private option of some encoder which was not actually used for
> any stream.


Other notes:

Are you sure "-map 1:a" belongs in there? That gives you one additional
output stream from a single unconcatenated input.

What do you need "-strict -2" for? ffmpeg's aac codec hasn't required
that for over a year.


So, finally, let me guess (!):
$ 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 -application voip \
  -frame_duration 60 -vbr off -compression_level 10  -packet_loss 0  \
  -dash_segment_type mp4 x.mpd

Cheers,
Moritz
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Re: creating dash multiple audio codecs

Moritz Barsnick
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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Re: 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 <[hidden email]> 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
> _______________________________________________
> ffmpeg-user mailing list
> [hidden email]
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [hidden email] with subject "unsubscribe".
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Re: creating dash multiple audio codecs

James Northrup
opus is apparently not the same as libopus.  nor are these matching
options.  opus encoder is claimed to be inferior to libopus encoder.

as it turns out, you DO need -strict -2 if you swap in flac codec for the
illegal copy codec in dash.

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 flac    -map '[out2]'  -c:a:1 libfdk_aac -b:a:1 32k
-profile:a:1 aac_he_v2      -map '[out3]'   -c:a:2 libopus -b:a:2 32k
-application:a:2 voip  -frame_duration:a:2 60 -vbr:a:2 off
-compression_level:a:2 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
Stream mapping:
  Stream #0:0 (aac) -> concat:in0:a0
  Stream #1:0 (aac) -> concat:in1:a0
  Stream #2:0 (aac) -> concat:in2:a0
  asplit:output0 -> Stream #0:0 (flac)
  asplit:output1 -> Stream #0:1 (libfdk_aac)
  asplit:output2 -> Stream #0:2 (libopus)
[flac @ 0x55babd0a42c0] encoding as 24 bits-per-sample
[dash @ 0x55babd0d3600] Opening 'init-stream0.mp4' for writing
[mp4 @ 0x55babd373b80] flac in MP4 support is experimental, add '-strict
-2' if you want to use it.
Could not write header for output file #0 (incorrect codec parameters ?):
Experimental feature
Error initializing output stream 0:2 --
Conversion failed!


On Sat, Mar 16, 2019 at 9:56 AM James Northrup <[hidden email]> wrote:

> 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 <[hidden email]> 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
>> _______________________________________________
>> ffmpeg-user mailing list
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>> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>>
>> To unsubscribe, visit link above, or email
>> [hidden email] with subject "unsubscribe".
>
>
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