[FFmpeg-trac] #5548(avcodec:new): FFV1 encoder creates invalid stream if width or height is 1 or 2

12 May 2016

      ...
ffmpeg -y -f lavfi -i testsrc -t 1 -filter:v scale="353:1" -vcodec ffv1
 -level 3 353x1.mkv
 ffmpeg version N-79630-g9ac154d Copyright (c) 2000-2016 the FFmpeg
 developers
   built with gcc 5.3.0 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-avisynth --enable-bzlib --enable-fontconfig --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-libmfx
 --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-
...
ffmpeg -i 353x1.mkv fake.mp4
 ffmpeg version N-79630-g9ac154d Copyright (c) 2000-2016 the FFmpeg
 developers
   built with gcc 5.3.0 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-avisynth --enable-bzlib --enable-fontconfig --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-libmfx
 --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-
#5548: FFV1 encoder creates invalid stream if width or height is 1 or 2
----------------------------------+---------------------------------------
             Reporter:  Zenitram  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avcodec   |                  Version:  unspecified
             Keywords:  FFV1      |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+---------------------------------------
 Summary of the bug:
 FFV1 encoder creates an invalid stream if width or height is 1 or 2.
 technical description: is such scenario, num_v_slices has a value of 2 so
 slice_y should be maximum 1, but slices have slice_y = 2 everywhere
 (instead of = 0 or 1).

 How to reproduce:
 {{{
 libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex
 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-
 amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-
 libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-
 libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
   libavutil      55. 22.101 / 55. 22.101
   libavcodec     57. 38.100 / 57. 38.100
   libavformat    57. 34.103 / 57. 34.103
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 44.100 /  6. 44.100
   libswscale      4.  1.100 /  4.  1.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, lavfi, from 'testsrc':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240
 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 25 tbn
 [matroska @ 0000000000f8e8e0] Using AVStream.codec to pass codec
 parameters to muxers is deprecated, use AVStream.codecpar instead.
 Output #0, matroska, to '353x1.mkv':
   Metadata:
     encoder         : Lavf57.34.103
     Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), bgr0, 353x1 [SAR 4:1059
 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 1k tbn
     Metadata:
       encoder         : Lavc57.38.100 ffv1
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> ffv1 (native))
 Press [q] to stop, [?] for help
 frame=   25 fps=0.0 q=-0.0 Lsize=      15kB time=00:00:00.96 bitrate=
 130.4kbits/s speed=44.7x
 video:14kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 7.009154%

 libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex
 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-
 amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-
 libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-
 libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
   libavutil      55. 22.101 / 55. 22.101
   libavcodec     57. 38.100 / 57. 38.100
   libavformat    57. 34.103 / 57. 34.103
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 44.100 /  6. 44.100
   libswscale      4.  1.100 /  4.  1.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 [ffv1 @ 00000000025245e0] slice count invalid
 [matroska,webm @ 00000000001d6e60] Failed to open codec in
 av_find_stream_info
 [ffv1 @ 00000000025245e0] slice count invalid
 Input #0, matroska,webm, from '353x1.mkv':
   Metadata:
     ENCODER         : Lavf57.34.103
   Duration: 00:00:01.00, start: 0.000000, bitrate: 125 kb/s
     Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), none, 353x1, SAR 1:255
 DAR 353:255, 25 fps, 25 tbr, 1k tbn (default)
     Metadata:
       ENCODER         : Lavc57.38.100 ffv1
       DURATION        : 00:00:01.000000000
 [buffer @ 00000000025179e0] Unable to parse option value "-1" as pixel
 format
     Last message repeated 1 times
 [buffer @ 00000000025179e0] Error setting option pix_fmt to value -1.
 [graph 0 input from stream 0:0 @ 0000000002517500] Error applying options
 to the filter.
 Error opening filters!
 }}}

 Same if you invert width and height.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5548>
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