[FFmpeg-trac] #4149(undetermined:open): Support mjpeg rotation

FFmpeg trac at avcodec.org
Thu Jul 2 00:00:02 CEST 2015


#4149: Support mjpeg rotation
-------------------------------------+-------------------------------------
             Reporter:  rrjp         |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mjpeg exif   |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by rogerdpack):

 I think I just ran into this today:

 original:

 identify -verbose 20150630_165653.jpg | grep -i orient
   Orientation: RightTop
     exif:Orientation: 6
     exif:thumbnail:Orientation: 6

 then if I use ffmpeg to convert it from jpeg to jpeg:


 ffmpeg -i 20150630_165653.jpg converted.jpg
 ffmpeg version N-44261-g0083c16 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM
 3.6.0svn)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared
 --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables
 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-
 libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid
 --enable-vda
   libavutil      54. 27.100 / 54. 27.100
   libavcodec     56. 45.101 / 56. 45.101
   libavformat    56. 40.100 / 56. 40.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 19.100 /  5. 19.100
   libavresample   2.  1.  0 /  2.  1.  0
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
   libpostproc    53.  3.100 / 53.  3.100
 Input #0, image2, from '20150630_165653.jpg':
   Duration: 00:00:00.04, start: 0.000000, bitrate: 1007788 kb/s
     Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown),
 5312x2988, 25 tbr, 25 tbn, 25 tbc
 Output #0, image2, to 'converted.jpg':
   Metadata:
     encoder         : Lavf56.40.100
     Stream #0:0: Video: mjpeg, yuvj422p(pc), 5312x2988, q=2-31, 200 kb/s,
 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc56.45.101 mjpeg
 Stream mapping:
   Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=9.8 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:615kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown

 $ identify -verbose converted.jpg | grep -i orient
   Orientation: Undefined


 orientation has been lost...

 My guess would be that maybe if it has a certain orientation, ffmpeg
 should "auto rotate" it so that it gets appropriate input, perhaps?

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4149#comment:4>
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