[FFmpeg-trac] #2046(undetermined:new): support changes to DAR/SAR during -codec copy

FFmpeg trac at avcodec.org
Wed Dec 19 15:42:33 CET 2012


#2046: support changes to DAR/SAR during -codec copy
-------------------------------------+-------------------------------------
               Reporter:  dericed    |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:
               Priority:  normal     |  undetermined
                Version:  git-       |               Keywords:  dar
  master                             |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 Summary of the bug:
 I would like to make adjustments to DAR without having to re-encode video.
 FFmpeg ignores options like -aspect and -vf setdar when using -c copy.

 How to reproduce:

 I create a sample file like this:
 ffmpeg -f lavfi -i testsrc=s=720x480:d=1 -pix_fmt yuv420p 720x480_3-2.mov

 I then try to adjust the DAR of file 720x480_3-2.mov to 4/3. like this

 {{{
 ffmpeg -i 720x480_3-2.mov -aspect 4/3 -c copy 720x480_4-3.mov
 ffmpeg version 1.0.git-ffmpeg4archivists Copyright (c) 2000-2012 the
 FFmpeg developers
   built on Nov 29 2012 11:38:09 with gcc 4.2.1 (GCC) (Apple Inc. build
 5666) (dot 3)
   configuration:
 --prefix=/Users/digitilization/github/ffmpeg4archivists/ffmpeg --as=yasm
 --extra-version=ffmpeg4archivists --extra-
 libs=-L/Users/digitilization/github/ffmpeg4archivists/libs --disable-
 shared --enable-static --disable-ffserver --enable-gpl --enable-pthreads
 --enable-postproc --enable-libmp3lame --enable-libtheora --enable-
 libvorbis --enable-libx264 --enable-libxvid --enable-libspeex --enable-
 bzlib --enable-zlib --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-version3 --enable-libvo-aacenc --enable-libvpx --enable-libopus
 --enable-filters --enable-runtime-cpudetect --disable-debug --enable-
 libfreetype --enable-libopenjpeg --cc=/usr/bin/gcc-4.2
   libavutil      52.  9.102 / 52.  9.102
   libavcodec     54. 77.100 / 54. 77.100
   libavformat    54. 39.100 / 54. 39.100
   libavdevice    54.  3.100 / 54.  3.100
   libavfilter     3. 23.104 /  3. 23.104
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.101 /  0. 17.101
   libpostproc    52.  2.100 / 52.  2.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '720x480_3-2.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 512
     compatible_brands: qt
     encoder         : Lavf54.39.100
   Duration: 00:00:01.00, start: 0.000000, bitrate: 108 kb/s
     Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
 720x480 [SAR 1:1 DAR 3:2], 99 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
     Metadata:
       handler_name    : DataHandler
 Output #0, mov, to '720x480_4-3.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 512
     compatible_brands: qt
     encoder         : Lavf54.39.100
     Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 720x480
 [SAR 1:1 DAR 3:2], q=2-31, 99 kb/s, 25 fps, 12800 tbn, 12800 tbc
     Metadata:
       handler_name    : DataHandler
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 frame=   25 fps=0.0 q=-1.0 Lsize=      13kB time=00:00:00.88 bitrate=
 123.6kbits/s
 video:12kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 8.819528%
 }}}

 And the output is still 3/2 DAR. The result is the same with -vf options.
 I was able to make this adjustment using muxmovie's -hscale option but
 would like to be able to do this in ffmpeg.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2046>
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