Opened 8 years ago
Closed 8 years ago
#5903 closed defect (duplicate)
remuxing to Matroska has inaccurate (slightly) display aspect ratio
Reported by: | dave rice | Owned by: | |
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Priority: | normal | Component: | avformat |
Version: | git-master | Keywords: | |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug:
To demonstate I'm using a reference file in mov created via:
ffmpeg -f lavfi -i testsrc=s=720x480 -frames:v 1 -aspect 15/11 s720x480_dar15x11.mov
Then remux to mkv via:
drice:scripts drice$ ffmpeg -i s720x480_dar15x11.mov -c copy s720x480_dar15x11.mkv ffmpeg version git-2016-10-21-5db3c94 Copyright (c) 2000-2016 the FFmpeg developers built with Apple LLVM version 8.0.0 (clang-800.0.38) configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD-5db3c94 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libass --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2/include/openjpeg-2.1 --enable-vda libavutil 55. 32.100 / 55. 32.100 libavcodec 57. 63.103 / 57. 63.103 libavformat 57. 52.100 / 57. 52.100 libavdevice 57. 0.103 / 57. 0.103 libavfilter 6. 64.100 / 6. 64.100 libavresample 3. 0. 0 / 3. 0. 0 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 2.100 / 2. 2.100 libpostproc 54. 0.100 / 54. 0.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 's720x480_dar15x11.mov': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf57.52.100 Duration: 00:00:00.04, start: 0.000000, bitrate: 1039 kb/s Stream #0:0(eng): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 720x480 [SAR 10:11 DAR 15:11], 869 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default) Metadata: handler_name : DataHandler encoder : Lavc57.63.103 libx264 Output #0, matroska, to 's720x480_dar15x11.mkv': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf57.52.100 Stream #0:0(eng): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 720x480 [SAR 10:11 DAR 15:11], q=2-31, 869 kb/s, 25 fps, 25 tbr, 1k tbn, 12800 tbc (default) Metadata: handler_name : DataHandler encoder : Lavc57.63.103 libx264 Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help frame= 1 fps=0.0 q=-1.0 Lsize= 5kB time=00:00:00.00 bitrate=42232.0kbits/s speed=3.37x video:4kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 21.412144%
In the resulting MKV file it has these values in the Video Element:
PixelWidth=720 PixelHeight=480 DisplayWidth=655 DisplayHeight=480 DisplayUnit={unstored, thus defaults to '0' which is 'pixels'}
This creates a minor DAR change since:
mov's DAR is (720/480)*(10/11) ~= 1.3636363636
mkv's DAR is 655/480 ~= 1.3645833333
If the file was remuxed with these values:
PixelWidth=720 PixelHeight=480 DisplayWidth=15 DisplayHeight=11 DisplayUnit=3 (3 means 'Display Aspect Ratio')
then the mov and the mkv would have an exact match for DAR.
Change History (1)
comment:1 by , 8 years ago
Keywords: | matroska removed |
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Resolution: | → duplicate |
Status: | new → closed |
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