One of those videos lower resolution, another one is higher

ffplay.exe -i [PATHTOFILE][org] -i[PATHTOFILE][enc];\
[org][enc]blend=all_mode=difference"enter code here

but i got error

    No such filter: [filename1][org][filename2][enc];
[org][enc]blend=all_mode=difference: Invalid argument

I Just want to compare my videos utilizing FFPLAY with many inputs to save some memory.

1 Answer 1


ffplay is designed to play a single input. So, a workaround is needed.

ffplay -f lavfi "movie=org[a];movie=enc[b];[a][b]blend=all_mode=difference"

A filtergraph is created and movie source filters used to open the files, then blended.

  • I got error Argument [filename] provided as input filename, but [filename][a]; " was already specified. Commented May 23, 2018 at 23:40
  • Add report to command and share report.
    – Gyan
    Commented May 24, 2018 at 5:04
  • pastebin.com/bZdu5GL0 - report Commented May 24, 2018 at 22:32
  • The command has to be in the form in my answer: ffplay -f lavfi "movie='C\:/Users/Lover/Desktop/video.wmv'[a];movie='C\:/Users/Lover/Desktop/video - Copy.wmv'[b];[a][b]blend=all_mode=difference"
    – Gyan
    Commented May 25, 2018 at 5:25
  • great! That works, is there any way how to create 2 ffplay windows to compare side by side? This blend mode doesn't help too much in my case. I can tell they different in terms of pixel peeping but i need full range of colors. Commented May 25, 2018 at 16:43

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