PNG and JPG: The Ultimate Test

[Sound Master]

I want to determine once and for all, which makes the best png and jpg files, ffmpeg or Virtualdub2.

For this, I extracted a frame as a png file and a jpg file from both tools. I also converted the jpgs into png files using ffmpeg and Virtualdub2. The files with _1 in their names are the virtualdub2 jpgs that were converted to pngs.

Can you spot the difference between these two files? Which jpg has the best quality (for ffmpeg, I used the code

ffmpeg -i input.mkv  -vf zscale=min=709:m=170m:rin=limited:r=full,format=yuv420p (the format of the video) -qmin 1 -qmax 1 -q:v 1 output%d.jpg

For Virtualdub2, I used jpeg quality at 100%)?


[Attachment 78356 - Click to enlarge]

[Attachment 78357 - Click to enlarge]

[sophisticles]

Minor detail, I am fairly certain that vdub, in any incarnation, does not contain unique encoders of any kind, audio, video or picture, it is only a front end for other encoders and in fact i am almost 100 percent certain that it uses ffmpeg for most things behind the scenes.

So...

[jagabo]

You need to take more care about color format (YUV 4:2:0 vs 4:4:4 vs RGB) and color matrix (limited range vs full range, rec.601 vs rec.709) issues. You've made too many errors to draw any conclusions.

[Sound Master]

You need to take more care about color format (YUV 4:2:0 vs 4:4:4 vs RGB) and color matrix (limited range vs full range, rec.601 vs rec.709) issues. You've made too many errors to draw any conclusions.

What should I do, then? How do I fix those errors?