[FFmpeg-user] Dolby E decoder
Paul B Mahol
onemda at gmail.com
Fri Sep 8 14:39:34 EEST 2017
On 9/8/17, Mike Brown <brown at mrvideo.vidiot.com> wrote:
> On Fri, Sep 08, 2017 at 01:15:06PM +0200, Paul B Mahol wrote:
>> On 9/8/17, Mike Brown <brown at mrvideo.vidiot.com> wrote:
>> > On Fri, Sep 08, 2017 at 09:34:50AM +0200, Paul B Mahol wrote:
>> >> On 9/8/17, Mike Brown <brown at mrvideo.vidiot.com> wrote:
>> >> > On Fri, Sep 08, 2017 at 12:54:12AM +0200, Carl Eugen Hoyos wrote:
>> >> >> (Sorry, my knowledge of SMPTE 337M is limited but I know that so
>> >> >> far,
>> >> >> this is the only "format" for which FFmpeg supports Dolby-E, and
>> >> >> that
>> >> >> adding support for other formats will be possible but hasn't been
>> >> >> done yet.)
>> >> >
>> >> > From what I understand, reading the synopsis of SMPTE-337M, is that
>> >> > it
>> >> > is
>> >> > not a container specifically for Dolby-E. I couldn't anything out of
>> >> > it
>> >> > to
>> >> > indicate that it can even handle Dolby-E.
>> >> >
>> >> > That said, I do deal with SMPTE-302M, which is the spec for which
>> >> > Dolby-E is
>> >> > applied to Transport Streams. In my case satellite feeds (not for
>> >> > the
>> >> > consumer). The spec talks about MPEG-2 TS streams, but it applies to
>> >> > H.264
>> >> > streams as well.
>> >> >
>> >> > Right now, I use ffmpeg to extract the stream into a 2-ch WAVE file,
>> >> > in
>> >> > which
>> >> > I use in another program to extract the audio into 6 mono WAVE files.
>> >> > I
>> >> > then
>> >> > use ffmpeg to encode a AC3 file.
>> >> >
>> >> > Are you saying that I can use ffmpeg and get to a final ac3 file in a
>> >> > single
>> >> > step?
>> >>
>> >> No, you would need to copy audio to raw container, this raw container
>> >> would be
>> >> then detected as Dolby-E.
>> >>
>> >> ffmpeg -i input.wav -c:a copy -f u8 out.u8
>> >>
>> >> ffmpeg -i out.u8 -c:a ac3 .....
>> >
>> > Could this not be done as a series of pipes:
>> >
>> > ffmpeg -i input.ts -map 0:2 -c:a pcm_s24le -f wav - | \
>> > ffmpeg -i - -c:a copy -f u24le - | \
>> > ffmpeg -drc_scale 0 -i - -c:a ac3 -ab 640k -center_mixlev 0.707
>> > output.ac3
>> >
>> > Will the 5.1 audio be mapped correctly?
>> >
>> > The Dolby-E is 24bit, not 8.
>>
>> Doesn't matter, your example will not work, try it.
>
> Why doesn't it matter?
>
> ffmpeg -i input_test.ts -map 0:1 -c:a pcm_s24le output_test.wav
You need -c:a copy here, but you may also need to override input codec.
> ffmpeg version N-52837-g399f6ef Copyright (c) 2000-2013 the FFmpeg
> developers
2013 ? Today year is 2017, Welcome to future.
> built on May 7 2013 01:09:00 with gcc 4.7.3 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads
> --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
> --enable-gnutls --enable-iconv --enable-libass --enable-libbluray
> --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc
> --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenjpeg --enable-libopus --enable-librtmp
> --enable-libschroedinger --enable-libsoxr --enable-libspeex
> --enable-libtheora --enable-libtwolame --enable-libvo-aacenc
> --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264
> --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 29.100 / 52. 29.100
> libavcodec 55. 7.100 / 55. 7.100
> libavformat 55. 4.101 / 55. 4.101
> libavdevice 55. 0.100 / 55. 0.100
> libavfilter 3. 63.101 / 3. 63.101
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 3.100 / 52. 3.100
> [mpegts @ 027f7b00] probed stream 4 failed
> [mpeg2video @ 027f8600] Invalid frame dimensions 0x0.
> Last message repeated 8 times
> [mpegts @ 027f7b00] Could not find codec parameters for stream 4 (Unknown:
> none (LU-A / 0x412D554C)): unknown codec
> Consider increasing the value for the 'analyzeduration' and 'probesize'
> options
> [mpegts @ 027f7b00] PES packet size mismatch
> Last message repeated 2 times
> Input #0, mpegts, from 'input_test.ts':
> Duration: 00:00:19.16, start: 94349.992444, bitrate: 43792 kb/s
> Program 1
> Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
> yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94
> tbc
> Stream #0:1[0x33](eng): Audio: s302m (BSSD / 0x44535342), 48000 Hz,
> stereo, s32, 2304 kb/s
> Stream #0:2[0x34](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
> stereo, s16p, 256 kb/s
> Stream #0:3[0x35](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
> stereo, s16p, 256 kb/s
> Stream #0:4[0x3b]: Unknown: none (LU-A / 0x412D554C)
> Output #0, wav, to 'output_test.wav':
> Metadata:
> ISFT : Lavf55.4.101
> Stream #0:0(eng): Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz,
> stereo, s32, 2304 kb/s
> Stream mapping:
> Stream #0:1 -> #0:0 (s302m -> pcm_s24le)
> Press [q] to stop, [?] for help
> [mpegts @ 027f7b00] PES packet size mismatch
> [s302m @ 027f42e0] frame has invalid header
> Error while decoding stream #0:1: Invalid data found when processing input
> size= 5330kB time=00:00:18.95 bitrate=2304.0kbits/s
> video:0kB audio:5330kB subtitle:0 global headers:0kB muxing overhead
> 0.001869%
>
>
> ffmpeg -i output_test.wav -c:a copy -f u24le output_test.u24
Too late for -c:a copy.
> ffmpeg version N-52837-g399f6ef Copyright (c) 2000-2013 the FFmpeg
> developers
> built on May 7 2013 01:09:00 with gcc 4.7.3 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads
> --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
> --enable-gnutls --enable-iconv --enable-libass --enable-libbluray
> --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc
> --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenjpeg --enable-libopus --enable-librtmp
> --enable-libschroedinger --enable-libsoxr --enable-libspeex
> --enable-libtheora --enable-libtwolame --enable-libvo-aacenc
> --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264
> --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 29.100 / 52. 29.100
> libavcodec 55. 7.100 / 55. 7.100
> libavformat 55. 4.101 / 55. 4.101
> libavdevice 55. 0.100 / 55. 0.100
> libavfilter 3. 63.101 / 3. 63.101
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 3.100 / 52. 3.100
> [wav @ 027f40a0] max_analyze_duration 5000000 reached at 5001333
> microseconds
> Input #0, wav, from 'output_test.wav':
> Metadata:
> encoder : Lavf55.4.101
> Duration: 00:00:18.95, bitrate: 2304 kb/s
> Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, stereo,
> s32, 2304 kb/s
> Output #0, u24le, to 'output_test.u24':
> Metadata:
> encoder : Lavf55.4.101
> Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, stereo,
> 2304 kb/s
> Stream mapping:
> Stream #0:0 -> #0:0 (copy)
> Press [q] to stop, [?] for help
> size= 5330kB time=00:00:18.95 bitrate=2304.0kbits/s
> video:0kB audio:5330kB subtitle:0 global headers:0kB muxing overhead
> 0.000000%
>
>
> ffmpeg -drc_scale 0 -i output_test.u24 -c:a ac3 -ab 640k -center_mixlev
> 0.707 output_test.ac3
> ffmpeg version N-52837-g399f6ef Copyright (c) 2000-2013 the FFmpeg
> developers
> built on May 7 2013 01:09:00 with gcc 4.7.3 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads
> --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
> --enable-gnutls --enable-iconv --enable-libass --enable-libbluray
> --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc
> --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenjpeg --enable-libopus --enable-librtmp
> --enable-libschroedinger --enable-libsoxr --enable-libspeex
> --enable-libtheora --enable-libtwolame --enable-libvo-aacenc
> --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264
> --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 29.100 / 52. 29.100
> libavcodec 55. 7.100 / 55. 7.100
> libavformat 55. 4.101 / 55. 4.101
> libavdevice 55. 0.100 / 55. 0.100
> libavfilter 3. 63.101 / 3. 63.101
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 3.100 / 52. 3.100
> output_test.u24: Invalid data found when processing input
>
>
> When I did it as pipes, the result was: Invalid data found when processing
> input
>
> So, I did them separately, as shown above. It made no difference if u8 was
> used instead.
>
> MB
> --
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