[FFmpeg-trac] #11164(avcodec:new): visual macroblock error with mpeg2video encoding
FFmpeg
trac at avcodec.org
Fri Aug 30 22:18:02 EEST 2024
#11164: visual macroblock error with mpeg2video encoding
------------------------------------+----------------------------------
Reporter: dave rice | Type: defect
Status: new | Priority: normal
Component: avcodec | Version: 6.1.1
Keywords: mpeg2video | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
------------------------------------+----------------------------------
Summary of the bug:
I've been using ffmpeg to create XDCam QuickTime files and found a
regression or change in going from ffmpeg 5 to 6.
The simplest command I can create to demonstrate this problem is below.
The ffmpeg at 5 output looks fine and represents the input well, the ffmpeg at 6
output shows some abundant macroblock errors.
How to reproduce:
This ffmpeg at 5 output looks okay:
{{{
% ffmpeg -y -i test.mp4 -c:v mpeg2video -non_linear_quant 1 -qmin 1
-pix_fmt yuv422p -vtag xd5b -q:v 1 -qmax 8 good.mov
ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
built with Apple clang version 13.0.0 (clang-1300.0.29.30)
configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2_6 --enable-shared
--enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-
ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom
--enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-
libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-
librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1
--enable-libtesseract --enable-libtheora --enable-libvidstab --enable-
libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-
libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma
--enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-
libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-
libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-
libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
libavutil 57. 28.100 / 57. 28.100
libavcodec 59. 37.100 / 59. 37.100
libavformat 59. 27.100 / 59. 27.100
libavdevice 59. 7.100 / 59. 7.100
libavfilter 8. 44.100 / 8. 44.100
libswscale 6. 7.100 / 6. 7.100
libswresample 4. 7.100 / 4. 7.100
libpostproc 56. 6.100 / 56. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf60.16.100
Duration: 00:00:05.07, start: 0.000000, bitrate: 6680 kb/s
Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661),
yuv420p(tv, bt709, progressive), 1920x1080, 4908 kb/s, 23.98 fps, 23.98
tbr, 24k tbn (default)
Metadata:
handler_name : ?Mainconcept Video Media Handler
vendor_id : [0][0][0][0]
encoder : AVC Coding
Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 189 kb/s (default)
Metadata:
handler_name : #Mainconcept MP4 Sound Media Handler
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mpeg2video (native))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mov, to 'good.mov':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf59.27.100
Stream #0:0(eng): Video: mpeg2video (4:2:2) (xd5b / 0x62356478),
yuv422p(tv, bt709, progressive), 1920x1080, q=2-31, 200 kb/s, 23.98 fps,
24k tbn (default)
Metadata:
handler_name : ?Mainconcept Video Media Handler
vendor_id : [0][0][0][0]
encoder : Lavc59.37.100 mpeg2video
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
Metadata:
handler_name : #Mainconcept MP4 Sound Media Handler
vendor_id : [0][0][0][0]
encoder : Lavc59.37.100 aac
frame= 121 fps=0.0 q=1.0 Lsize= 17383kB time=00:00:05.01
bitrate=28405.3kbits/s speed=11.9x
video:17298kB audio:81kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.022841%
[aac @ 0x7fc93af05d40] Qavg: 565.772
}}}
This ffmpeg at 6 output has visual artifacts.
{{{
% ffmpeg -y -i test.mp4 -c:v mpeg2video -non_linear_quant 1 -qmin 1
-pix_fmt yuv422p -vtag xd5b -q:v 1 -qmax 8 bad.mov
ffmpeg version 6.1.2 Copyright (c) 2000-2024 the FFmpeg developers
built with Apple clang version 14.0.0 (clang-1400.0.29.202)
configuration: --prefix='/opt/homebrew/Cellar/ffmpeg at 6/6.1.2_1'
--enable-shared --enable-pthreads --enable-version3 --cc=clang --host-
cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl
--enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d
--enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus
--enable-librav1e --enable-librist --enable-librubberband --enable-
libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-
libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-
libfontconfig --enable-libfreetype --enable-frei0r --enable-libass
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq
--enable-libzimg --disable-libjack --disable-indev=jack --enable-
videotoolbox --enable-audiotoolbox --enable-neon
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
libpostproc 57. 3.100 / 57. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf60.16.100
Duration: 00:00:05.07, start: 0.000000, bitrate: 6680 kb/s
Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661),
yuv420p(tv, bt709, progressive), 1920x1080, 4908 kb/s, 23.98 fps, 23.98
tbr, 24k tbn (default)
Metadata:
handler_name : ?Mainconcept Video Media Handler
vendor_id : [0][0][0][0]
encoder : AVC Coding
Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 189 kb/s (default)
Metadata:
handler_name : #Mainconcept MP4 Sound Media Handler
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mpeg2video (native))
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mov, to 'bad.mov':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf60.16.100
Stream #0:0(eng): Video: mpeg2video (4:2:2) (xd5b / 0x62356478),
yuv422p(tv, bt709, progressive), 1920x1080, q=2-31, 200 kb/s, 23.98 fps,
24k tbn (default)
Metadata:
handler_name : ?Mainconcept Video Media Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 mpeg2video
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
Metadata:
handler_name : #Mainconcept MP4 Sound Media Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 aac
[out#0/mov @ 0x14a705d10] video:17378kB audio:82kB subtitle:0kB other
streams:0kB global headers:0kB muxing overhead: 0.022736%
frame= 121 fps=0.0 q=1.0 Lsize= 17464kB time=00:00:04.99
bitrate=28658.8kbits/s speed=13.1x
[aac @ 0x14a65b480] Qavg: 566.517
}}}
Patches should be submitted to the ffmpeg-devel mailing list and not this
bug tracker.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11164>
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