[FFmpeg-trac] #1568(FFprobe:new): ffprobe: SAR / DAR values not mapped in JSON output when input file gets transcoded to WEBM

[FFmpeg]

#1568: ffprobe: SAR / DAR values not mapped in JSON output when input file gets
transcoded to WEBM
-------------------------------------+-------------------------------------
               Reporter:  czellweg   |                  Owner:  stefano
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:  FFprobe
                Version:             |               Keywords:  json, webm,
  unspecified                        |  transcoding, ffprobe
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 Summary of the bug:
 If a input video source is transcoded to WEBM, the SAR & DAR values are
 not mapped in the JSON output (using '-print_format json -show_streams')
 even though they are available as header information.

 As you can see from the output below, the video stream ('Stream #0:0:
 Video:') line contains the SAR and DAR values ('SAR 1:1 DAR 427:181') but
 they are not visible in the corresponding JSON output.

 How to reproduce:
 {{{
 % ffprobe -print_format json -show_streams cinemascope-sample.webm
 ffprobe version N-41991-g87df986 Copyright (c) 2007-2012 the FFmpeg
 developers
   built on Jun 28 2012 12:21:41 with gcc 4.4.3
   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-
 postproc --enable-libfaac --enable-libtheora --enable-libvorbis --enable-
 libx264 --enable-libxvid --enable-x11grab --enable-libvpx --enable-
 pthreads --enable-libmp3lame --enable-libaacplus --enable-libopencore-
 amrnb --enable-libopencore-amrwb
   libavutil      51. 63.100 / 51. 63.100
   libavcodec     54. 29.101 / 54. 29.101
   libavformat    54. 11.100 / 54. 11.100
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     3.  0.100 /  3.  0.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 Input #0, matroska,webm, from 'cinemascope-sample.webm':
   Metadata:
     creation_time   : 2010-03-23 13:46:00
   Duration: 00:00:18.81, start: 0.000000, bitrate: 982 kb/s
     Stream #0:0: Video: vp8, yuv420p, 854x362, SAR 1:1 DAR 427:181, 23.98
 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
 {
     "streams": [
         {
             "index": 0,
             "codec_name": "vp8",
             "codec_long_name": "On2 VP8",
             "codec_type": "video",
             "codec_time_base": "1/1000",
             "codec_tag_string": "[0][0][0][0]",
             "codec_tag": "0x0000",
             "width": 854,
             "height": 362,
             "has_b_frames": 0,
             "pix_fmt": "yuv420p",
             "level": -99,
             "r_frame_rate": "24000/1001",
             "avg_frame_rate": "24000/1001",
             "time_base": "1/1000",
             "start_time": "0.000000"
         }
     ]
 }
 }}}

 Expected output would be:
 {{{
 % ffprobe -print_format json -show_streams cinemascope-sample.webm
 ffprobe version N-41991-g87df986 Copyright (c) 2007-2012 the FFmpeg
 developers
   built on Jun 28 2012 12:21:41 with gcc 4.4.3
   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-
 postproc --enable-libfaac --enable-libtheora --enable-libvorbis --enable-
 libx264 --enable-libxvid --enable-x11grab --enable-libvpx --enable-
 pthreads --enable-libmp3lame --enable-libaacplus --enable-libopencore-
 amrnb --enable-libopencore-amrwb
   libavutil      51. 63.100 / 51. 63.100
   libavcodec     54. 29.101 / 54. 29.101
   libavformat    54. 11.100 / 54. 11.100
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     3.  0.100 /  3.  0.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 Input #0, matroska,webm, from 'cinemascope-sample.webm':
   Metadata:
     creation_time   : 2010-03-23 13:46:00
   Duration: 00:00:18.81, start: 0.000000, bitrate: 982 kb/s
     Stream #0:0: Video: vp8, yuv420p, 854x362, SAR 1:1 DAR 427:181, 23.98
 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
 {
     "streams": [
         {
             "index": 0,
             "codec_name": "vp8",
             "codec_long_name": "On2 VP8",
             "codec_type": "video",
             "codec_time_base": "1/1000",
             "codec_tag_string": "[0][0][0][0]",
             "codec_tag": "0x0000",
             "width": 854,
             "height": 362,
             "has_b_frames": 0,
             "sample_aspect_ratio": "1:1",
             "display_aspect_ratio": "427:181",
             "pix_fmt": "yuv420p",
             "level": -99,
             "r_frame_rate": "24000/1001",
             "avg_frame_rate": "24000/1001",
             "time_base": "1/1000",
             "start_time": "0.000000"
         }
     ]
 }
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1568>
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