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

[Cecil Westerhof]

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?
Or how can I specify the pixel format of the jpeg files to see if it
works?

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