[FFmpeg-trac] #4518(avcodec:new): Bad pix_fmt decision if input is gray but only yuvj4xx is supported (was: Bad pix_fmt decision if input is gray but only yuv4xx is supported)

[FFmpeg]

#4518: Bad pix_fmt decision if input is gray but only yuvj4xx is supported
------------------------------------+-----------------------------------
             Reporter:  cehoyos     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  minor       |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+-----------------------------------
Description changed by cehoyos:

Old description:

> I believe that yuv420p is the better pix_fmt if the input is gray and
> only yuv4xx are supported.
> {{{
> $ ffmpeg -i fate-suite/lena.pnm -vf format=gray out.jpg
> ffmpeg version N-71727-g46778ab Copyright (c) 2000-2015 the FFmpeg
> developers
>   built with gcc 4.7 (SUSE Linux)
>   configuration: --enable-gpl
>   libavutil      54. 23.101 / 54. 23.101
>   libavcodec     56. 35.101 / 56. 35.101
>   libavformat    56. 31.100 / 56. 31.100
>   libavdevice    56.  4.100 / 56.  4.100
>   libavfilter     5. 14.100 /  5. 14.100
>   libswscale      3.  1.101 /  3.  1.101
>   libswresample   1.  1.100 /  1.  1.100
>   libpostproc    53.  3.100 / 53.  3.100
> Input #0, image2, from 'fate-suite/lena.pnm':
>   Duration: 00:00:00.04, start: 0.000000, bitrate: 39333 kb/s
>     Stream #0:0: Video: ppm, rgb24, 256x256, 25 tbr, 25 tbn, 25 tbc
> [swscaler @ 0x2470100] deprecated pixel format used, make sure you did
> set range correctly
> Output #0, image2, to 'out.jpg':
>   Metadata:
>     encoder         : Lavf56.31.100
>     Stream #0:0: Video: mjpeg, yuvj444p(pc), 256x256, q=2-31, 200 kb/s,
> 25 fps, 25 tbn, 25 tbc
>     Metadata:
>       encoder         : Lavc56.35.101 mjpeg
> Stream mapping:
>   Stream #0:0 -> #0:0 (ppm (native) -> mjpeg (native))
> Press [q] to stop, [?] for help
> frame=    1 fps=0.0 q=4.1 Lsize=N/A time=00:00:00.04 bitrate=N/A
> video:11kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: unknown
> }}}
> Also reproducible with h264 output.

New description:

 I believe that yuvj420p is the better pix_fmt if the input is gray and
 only yuvj4xx are supported.
 {{{
 $ ffmpeg -i fate-suite/lena.pnm -vf format=gray out.jpg
 ffmpeg version N-71727-g46778ab Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54. 23.101 / 54. 23.101
   libavcodec     56. 35.101 / 56. 35.101
   libavformat    56. 31.100 / 56. 31.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 14.100 /  5. 14.100
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  3.100 / 53.  3.100
 Input #0, image2, from 'fate-suite/lena.pnm':
   Duration: 00:00:00.04, start: 0.000000, bitrate: 39333 kb/s
     Stream #0:0: Video: ppm, rgb24, 256x256, 25 tbr, 25 tbn, 25 tbc
 [swscaler @ 0x2470100] deprecated pixel format used, make sure you did set
 range correctly
 Output #0, image2, to 'out.jpg':
   Metadata:
     encoder         : Lavf56.31.100
     Stream #0:0: Video: mjpeg, yuvj444p(pc), 256x256, q=2-31, 200 kb/s, 25
 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc56.35.101 mjpeg
 Stream mapping:
   Stream #0:0 -> #0:0 (ppm (native) -> mjpeg (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=4.1 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:11kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}
 Also reproducible with h264 output.

--

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4518#comment:1>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker