[FFmpeg-user] deprecated pixel format used, make sure you did set range correctly

[Cecil Westerhof]

Michael Koch <astroelectronic at t-online.de> writes:

> Am 11.06.2023 um 11:33 schrieb Cecil Westerhof via ffmpeg-user:
>> Ferdi Scholten <ferdi at sttc-nlp.nl> writes:
>>
>>> I make a slideshow of my pictures with:
>>>>       ffmpeg -y -i %04d.jpg -i
>>>> /home/cecil/Audio/YouTube/Symphony_No_5_by_Beethoven.mp3 -pix_fmt
>>>> yuv420p -vcodec libx264 -crf 26 -acodec libmp3lame -qscale:a 9 -preset
>>>> veryfast -vf
>>>> zoompan=d=3:fps=.333:s=1280x960,framerate=25:interp_start=0:interp_end=255:scene=100
>>>> huizeDoorn.mp4
>>>>
>>>> It looks OK, but I get a lot of the following messages:
>>>>       deprecated pixel format used, make sure you did set range correctly
>>>>
>>>> Am I doing something wrong? Should I be worried?
>>> No you are not doing anything wrong, the warning is displayed because
>>> the pixelformat of your input source (the jpeg file) uses a deprecated
>>> pixelformat with a different range for luma and chroma as your output
>>> pixelformat, this can lead to differences in color and/or brightness
>>>
>>> yuvj422p is the deprecated pixelformat used by your jpg files (range
>>> 0-255 for luma and chroma) 16 bpp
>>> yuv420p is the pixelformat of your output. (range 16-235 for luma and
>>> 16-240 for chroma) 12 bpp
>>>
>>> So three conversions need to be made here:
>>> yuv conversion from 4:2:2 to 4:2:0
>>> range conversion for y
>>> range conversion for uv
>>>
>>> The warning might disappear (not tested this so not sure about it) if
>>> you specify the pixelformat of your jpg file in your command as it is
>>> now being autodetected by ffmpeg and the autodetection might be
>>> wrong
>> How can I determine the pixel format of my jpeg files?
>
> ffprobe yourfile.jpg
> or
> ffmpeg -i yourfile.jpg

I already tried that and got this:
ffmpeg version 5.1.git-82278e8 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 10 (Debian 10.2.1-6)
  configuration: --enable-gpl --enable-version3 --enable-libx264 --enable-libx265 --enable-libmp3lame --enable-libfontconfig --enable-libfreetype --enable-libfribidi
  libavutil      58.  9.100 / 58.  9.100
  libavcodec     60. 14.101 / 60. 14.101
  libavformat    60.  5.100 / 60.  5.100
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  8.101 /  9.  8.101
  libswscale      7.  2.100 /  7.  2.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
Input #0, image2, from '0001.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 53673 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 1280x960 [SAR 180:180 DAR 4:3], 25 fps, 25 tbr, 25 tbn

But this is I think auto detected and could be wrong. (If I read the
reply of Ferdi correctly.)

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof