#7554: ac3_core bitstream filter for TrueHD
-------------------------------------+-------------------------------------
Reporter: Sami32 | Owner:
Type: defect | Status: closed
Priority: normal | Component:
Version: unspecified | undetermined
Keywords: | Resolution: invalid
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
-------------------------------------+-------------------------------------
Comment (by Sami32):
In tsMuxeR manual:
- down-to-ac3 Available only for TRUE-HD tracks. Filter out HD part.
Some container does not support interleaved TrueHD+AC3.
Example of such file that could avoid audio transcoding if a bitstream
filter was available for this case:
https://www15.zippyshare.com/v/v5Nxi6Rm/file.html
{{{
ffmpeg.exe -i dolby_EAC3_TrueHD_amaze_lossless-DWEU.m2ts -report -loglevel
debug
ffmpeg version N-92192-g57f312a34d Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 8.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-avisynth
--enable-fontconfig --enable-gnutls --enable-libaom --enable-libass
--enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio
--enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm
--enable-libilbc --enable-libkvazaar --enable-libmfx --enable-libmodplug
--enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-
librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-
libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2
--enable-libzimg --enable-opengl --enable-pthreads --disable-w32threads
--disable-dxva2 --disable-debug --pkg-config-flags=--static --extra-
ldflags=-static --extra-cflags='-mtune=generic -mfpmath=sse -msse'
--cpu=i686 --optflags='-O2 -finline-fun libavutil 56. 19.101 / 56.
19.101
libavcodec 58. 33.100 / 58. 33.100
libavformat 58. 19.100 / 58. 19.100
libavdevice 58. 4.105 / 58. 4.105
libavfilter 7. 33.101 / 7. 33.101
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
Splitting the commandline.
Reading option '-i' ... matched as input url with argument
'dolby_EAC3_TrueHD_amaze_lossless-DWEU.m2ts'.
Reading option '-report' ... matched as option 'report' (generate a
report) with argument '1'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging
level) with argument 'debug'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url dolby_EAC3_TrueHD_amaze_lossless-
DWEU.m2ts.
Successfully parsed a group of options.
Opening an input file: dolby_EAC3_TrueHD_amaze_lossless-DWEU.m2ts.
[NULL @ 080711c0] Opening 'dolby_EAC3_TrueHD_amaze_lossless-DWEU.m2ts' for
reading
[file @ 08071dc0] Setting default whitelist 'file,crypto'
[mpegts @ 080711c0] Format mpegts probed with size=2048 and score=50
[mpegts @ 080711c0] stream=0 stream_type=1b pid=1011 prog_reg_desc=HDMV
[mpegts @ 080711c0] stream=1 stream_type=83 pid=1100 prog_reg_desc=HDMV
[mpegts @ 080711c0] stream=3 stream_type=84 pid=1101 prog_reg_desc=HDMV
[mpegts @ 080711c0] Before avformat_find_stream_info() pos: 0 bytes
read:32768 seeks:0 nb_streams:4
[AVBSFContext @ 0814cf80] nal_unit_type: 9(AUD), nal_ref_idc: 0
[AVBSFContext @ 0814cf80] nal_unit_type: 7(SPS), nal_ref_idc: 3
[AVBSFContext @ 0814cf80] nal_unit_type: 8(PPS), nal_ref_idc: 3
[AVBSFContext @ 0814cf80] nal_unit_type: 6(SEI), nal_ref_idc: 0
[AVBSFContext @ 0814cf80] nal_unit_type: 6(SEI), nal_ref_idc: 0
[AVBSFContext @ 0814cf80] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 08072440] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 08072440] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 08072440] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 08072440] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 08072440] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 08072440] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 08072440] Format yuv420p chosen by get_format().
[h264 @ 08072440] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 08072440] no picture
[eac3 @ 08075300] channel_map: 1A00
[mpegts @ 080711c0] max_analyze_duration 5000000 reached at 5000000
microseconds st:1
[mpegts @ 080711c0] After avformat_find_stream_info() pos: 0 bytes
read:4329616 seeks:2 frames:6436
Input #0, mpegts, from 'dolby_EAC3_TrueHD_amaze_lossless-DWEU.m2ts':
Duration: 00:01:03.52, start: 4200.000000, bitrate: 22899 kb/s
Program 1
Stream #0:0[0x1011](eng), 122, 1/90000: Video: h264 (High), 1
reference frame (HDMV / 0x564D4448), yuv420p(progressive, left), 1920x1080
(1920x1088), 0/1, 24 fps, 24 tbr, 90k tbn, 48 tbc
Stream #0:1[0x1100], 6002, 1/90000: Audio: truehd (AC-3 / 0x332D4341),
48000 Hz, 7.1, s32 (24 bit)
Stream #0:2[0x1100], 156, 1/90000: Audio: ac3 (AC-3 / 0x332D4341),
48000 Hz, 5.1(side), fltp, 640 kb/s
Stream #0:3[0x1101], 156, 1/90000: Audio: eac3 (AC-3 / 0x332D4341),
48000 Hz, 7.1, fltp, 1664 kb/s
Successfully opened the file.
At least one output file must be specified
[AVIOContext @ 0807a0c0] Statistics: 4329616 bytes read, 2 seeks
}}}
Sorry for having thought that was an evidence...
Hoping that now it make some sens to you?
Note: Merci Carl for the "subtitling", as you know my english is weak ;)
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7554#comment:3>
FFmpeg <https://ffmpeg.org>
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