[FFmpeg-trac] #3813(undetermined:new): Unable to isolate a single line of video with latest ffmpeg

[FFmpeg]

#3813: Unable to isolate a single line of video with latest ffmpeg
-------------------------------------+-------------------------------------
             Reporter:  MReedAustin  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 I am attempting to use a filter chain to take only line 31 of a video,
 resize it to 720x576, and run it through the black detection filter, in an
 effort to detect Teletext subtitles in the Vertical Blanking Interval of
 my input video (console output is redirected into a script variable and
 then tested). The video output is to be sent to Null, as I am only
 interested in the [Blackdetect...] reports. This worked under Windows
 build N-60329-ge708424 built Feb 3 2014 22:01:02, but does not work with
 current 64-bit Windows version - full console output is given below.

 The issue does not occur if the height of the crop is greater than 1, but
 line 32 is the first line of active picture so I cannot make my crop
 output any taller.

 How to reproduce:
 {{{
 % ffmpeg -i file.mxf -filter_complex "crop=x=0:y=31:w=iw:h=1,
 scale=w=iw:h=576, blackdetect=d=0.04:pix_th=0.05" -an -f null -

 Console output as follows;
 ffmpeg version N-65085-g4f91bb0 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Jul 28 2014 22:10:25 with gcc 4.8.3 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-avisynth --enable-bzlib --enable-fontconfi
 g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-
 libbluray --enable-libbs2b --enable-libcaca --
 enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc
 --enable-libmodplug --enable-libmp3lame --enable-lib
 opencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-
 libopus --enable-librtmp --enable-libschroedinge
 r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-
 libtwolame --enable-libvidstab --enable-libvo-aacenc --
 enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-
 libwavpack --enable-libwebp --enable-libx264 --enable-
 libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
   libavutil      52. 92.101 / 52. 92.101
   libavcodec     55. 71.100 / 55. 71.100
   libavformat    55. 49.100 / 55. 49.100
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 11.102 /  4. 11.102
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 Guessed Channel Layout for  Input Stream #0.1 : 7.1
 Input #0, mxf, from 'File.mxf':
   Metadata:
     uid             : 9d6ee811-d617-11e3-83be-ac162dbbc568
     generation_uid  : 9d6ee812-d617-11e3-bd75-ac162dbbc568
     company_name    : Telestream
     product_name    : FlipFactory
     product_version : 3.0
     application_platform: win32
     product_uid     : ffeeddcc-bbaa-9988-7766-554433221100
     modification_date: 2014-05-07 18:44:26
     timecode        : 00:00:24:24
   Duration: 00:00:30.00, start: 0.000000, bitrate: 62572 kb/s
     Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, bt470bg), 720x608
 [SAR 608:405 DAR 16:9], max. 50000 kb/s, 25 fp
 s, 25 tbr, 25 tbn, 50 tbc
     Stream #0:1: Audio: pcm_s16le, 48000 Hz, 8 channels, s16, 6144 kb/s
 [NULL @ 00000000047655c0] ignoring invalid SAR: 38912/45
 [null @ 0000000004764920] Aspect ratio mismatch between muxer (38912/45)
 and encoder layer (0/1)
 Output #0, null, to 'pipe:':
   Metadata:
     uid             : 9d6ee811-d617-11e3-83be-ac162dbbc568
     generation_uid  : 9d6ee812-d617-11e3-bd75-ac162dbbc568
     company_name    : Telestream
     product_name    : FlipFactory
     product_version : 3.0
     application_platform: win32
     product_uid     : ffeeddcc-bbaa-9988-7766-554433221100
     modification_date: 2014-05-07 18:44:26
     timecode        : 00:00:24:24
     Stream #0:0: Video: rawvideo (Y42B / 0x42323459), yuv422p, 720x576,
 q=2-31, 200 kb/s, SAR 38912:45 DAR 9728:9, 25 fp
 s, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc55.71.100 rawvideo
 Stream mapping:
   Stream #0:0 (mpeg2video) -> crop
   blackdetect -> Stream #0:0 (rawvideo)
 Could not write header for output file #0 (incorrect codec parameters ?):
 Error number -22 occurred

 ffmpeg version N-65085-g4f91bb0
 built on Jul 28 2014 22:10:25
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3813>
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