#8349: Dolby AC-4 Support
-------------------------------------+------------------------------------
Reporter: Nomis101 | Owner: (none)
Type: enhancement | Status: reopened
Priority: wish | Component: avcodec
Version: git-master | Resolution:
Keywords: ac4 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+------------------------------------
Changes (by Brad Isbell):
* cc: Brad Isbell (added)
Comment:
Hello all. I saw that AC-4 had been partially added to FFmpeg, but
doesn't support any decoding or encoding at this time. Along the lines of
Reuben's question, is there any blocker (legal, technical, or otherwise)
that prevents merging in a patch for AC-4 decoder support?
I also wonder if there's a way we can use platform codecs, such as Media
Foundation Transform (MFT), for which AC-4 is available to OEMs. If so,
then we wouldn't have to worry about licensing issues, as far as I
understand it.
{{{
ffplay -loglevel debug http://192.0.2.3:5004/auto/v104.1
ffplay version 2024-12-11-git-a518b5540d-full_build-www.gyan.dev Copyright
(c) 2003-2024 the FFmpeg developers
built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-
w32threads --disable-autodetect --enable-fontconfig --enable-iconv
--enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma
--enable-libsnappy --enable-zlib --enable-librist --enable-libsrt
--enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
--enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption
--enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc
--enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode
--enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve
--enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-
mediafoundation --enable-libass --enable-frei0r --enable-libfreetype
--enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-
libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-
llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va
--enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-
vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-
opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-
libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-
libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc
--enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3
--enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-
libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-
libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 59. 49.100 / 59. 49.100
libavcodec 61. 26.100 / 61. 26.100
libavformat 61. 9.100 / 61. 9.100
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 6.101 / 10. 6.101
libswscale 8. 12.100 / 8. 12.100
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100
Initialized direct3d renderer.
[AVFormatContext @ 000001cd6a82d440] Opening
'http://192.0.2.3:5004/auto/v104.1' for reading
[http @ 000001cd6a82da40] Setting default whitelist
'http,https,tls,rtp,tcp,udp,crypto,httpproxy,data'
[tcp @ 000001cd6a82db40] Original list of addresses:
[tcp @ 000001cd6a82db40] Address 192.0.2.3 port 5004
[tcp @ 000001cd6a82db40] Interleaved list of addresses:
[tcp @ 000001cd6a82db40] Address 192.0.2.3 port 5004
[tcp @ 000001cd6a82db40] Starting connection attempt to 192.0.2.3 port
5004
[tcp @ 000001cd6a82db40] Successfully connected to 192.0.2.3 port 5004
[http @ 000001cd6a82da40] request: GET /auto/v104.1 HTTP/1.1
User-Agent: Lavf/61.9.100
Accept: */*
Range: bytes=0-
Connection: close
Host: 192.0.2.3:5004
Icy-MetaData: 1
[mpegts @ 000001cd6a82d440] Format mpegts probed with size=2048 and
score=50
[mpegts @ 000001cd6a82d440] stream=0 stream_type=24 pid=31 prog_reg_desc=
[mpegts @ 000001cd6a82d440] stream=1 stream_type=6 pid=32 prog_reg_desc=
[mpegts @ 000001cd6a82d440] stream=2 stream_type=6 pid=39 prog_reg_desc=
[mpegts @ 000001cd6a82d440] stream=3 stream_type=6 pid=33 prog_reg_desc=
[mpegts @ 000001cd6a82d440] Before avformat_find_stream_info() pos: 0
bytes read:6204 seeks:0 nb_streams:4
[mpegts @ 000001cd6a82d440] parser not found for codec ac4, packets or
times may be invalid.
Last message repeated 1 times
[mpegts @ 000001cd6a82d440] probing stream 2 pp:2500
[mpegts @ 000001cd6a82d440] probing stream 2 pp:2499= 0B
[mpegts @ 000001cd6a82d440] probing stream 2 pp:2498= 0B
[mpegts @ 000001cd6a82d440] probing stream 2 pp:2497= 0B
[mpegts @ 000001cd6a82d440] probing stream 2 pp:2496= 0B
[mpegts @ 000001cd6a82d440] probing stream 2 pp:2495= 0B
[mpegts @ 000001cd6a82d440] probed stream 2
[mpegts @ 000001cd6a82d440] parser not found for codec bin_data, packets
or times may be invalid.
[mpegts @ 000001cd6a82d440] parser not found for codec ac4, packets or
times may be invalid.
Last message repeated 1 times
… (various HEVC debugging messages) …
[mpegts @ 000001cd6a82d440] max_analyze_duration 7000000 reached at
7007000 microseconds st:1
[mpegts @ 000001cd6a82d440] rfps: 60.000000 0.014560
[mpegts @ 000001cd6a82d440] rfps: 59.940060 0.000000
Last message repeated 1 times
[mpegts @ 000001cd6a82d440] Could not find codec parameters for stream 1
(Audio: ac4 (AC-4 / 0x342D4341), 0 channels): unspecified sample rate
Consider increasing the value for the 'analyzeduration' (0) and
'probesize' (5000000) options
[mpegts @ 000001cd6a82d440] Could not find codec parameters for stream 3
(Audio: ac4 (AC-4 / 0x342D4341), 0 channels): unspecified sample rate
Consider increasing the value for the 'analyzeduration' (0) and
'probesize' (5000000) options
[mpegts @ 000001cd6a82d440] After avformat_find_stream_info() pos: 5270956
bytes read:5272104 seeks:0 frames:846
Input #0, mpegts, from 'http://192.0.2.3:5004/auto/v104.1':
Duration: N/A, start: 66559.780100, bitrate: N/A
Program 3
Stream #0:0[0x31], 419, 1/90000: Video: hevc (Main 10), 1 reference
frame ([36][0][0][0] / 0x0024), yuv420p10le(tv, bt709, left), 1920x1080
[SAR 1:1 DAR 16:9], 0/1, 59.94 fps, 59.94 tbr, 90k tbn
Stream #0:1[0x32](eng), 212, 1/90000: Audio: ac4 (AC-4 / 0x342D4341), 0
channels
Stream #0:2[0x39](eng), 4, 1/90000: Data: bin_data (STPP / 0x50505453),
0/1
Stream #0:3[0x33](spa), 211, 1/90000: Audio: ac4 (AC-4 / 0x342D4341), 0
channels
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8349#comment:91>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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