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An amateur tip that I sometimes use after I reencode something to check what i lost: ffmpeg -i source.mkv -i suspect.mkv -filter_complex "blend=all_mode=differ

by Habgdnv 10mo ago

An amateur tip that I sometimes use after I reencode something to check what i lost: ffmpeg -i source.mkv -i suspect.mkv -filter_complex "blend=all_mode=difference" diff_output.mkv I saw these claims before but still have not found someone to show a diff or post the source for comparison. It would be interesting.

rpastuszak 10mo ago
Hehe, I occasionally use a similar approach for visual regression testing: https://untested.sonnet.io/notes/visual-snapshot-tests-cheap-bastard-editiontm/ https://untested.sonnet.io/notes/visual-snapshot-tests-cheap...
jbaber 10mo ago
Thank you for this good idea and oneliner.
randoomed 10mo ago
Jill Bearup posted a video about this a while ago, showing a short and the original side by side: https://www.youtube.com/watch?v=kd692naF-Cc https://www.youtube.com/watch?v=kd692naF-Cc (note the short is shown at 0:31) Edit: The changes made by the ai are a lot more vissible in the higher quality video uploaded to patreon: https://www.patreon.com/posts/136994036 https://www.patreon.com/posts/136994036 (this was also linked in the pinned comment on the youtube video)
- sgerenser 10mo ago
  The before/after on this just looks like compression artifacts/smoothing to me.
- AnonHP 10mo ago
  It must be my eyes and the small screen on my phone. I couldn’t find any differences in the video on Patreon, which was annoying enough to watch with the actual comparison clip being just a couple of seconds or so, and I had to rewind and check again. I wish it had shown more of the comparisons. Most of the current video was just commentary.
  - gblargg 10mo ago
    Same here, on a big screen, I don't see anything notable. I really hope this isn't a mass delusion because YouTube started applying a sharpness ("edge enhancement") filter to videos to make them look sharper. It sure looks like that to me, because I hate this filter and how so many movie transfers have it added, with the ringing at the edges this filter leaves.
- tetris11 10mo ago
  I still can't see the differences in the patreon
  - sgerenser 10mo ago
    It’s because you’re looking for some kind of “smoking gun” AI transformation. In reality it just looks like the YouTube one is more compressed and slightly blurred. Some people are apparently just learning that YouTube recompresses videos.
- IshKebab 10mo ago
  Yeah I also can't see the difference on the high quality video. I am on my phone though tbf. Also, minus 100 points to Jill for being happy about being able to use AI to automatically edit out all the silence from her videos. That's far more annoying than any barely perceptible visual artifacts. Why do people think wall-of-text videos are good?

by Habgdnv 10mo ago

rpastuszak 10mo ago

Hehe, I occasionally use a similar approach for visual regression testing: https://untested.sonnet.io/notes/visual-snapshot-tests-cheap-bastard-editiontm/ https://untested.sonnet.io/notes/visual-snapshot-tests-cheap...

jbaber 10mo ago

Thank you for this good idea and oneliner.

randoomed 10mo ago

Jill Bearup posted a video about this a while ago, showing a short and the original side by side: https://www.youtube.com/watch?v=kd692naF-Cc https://www.youtube.com/watch?v=kd692naF-Cc (note the short is shown at 0:31) Edit: The changes made by the ai are a lot more vissible in the higher quality video uploaded to patreon: https://www.patreon.com/posts/136994036 https://www.patreon.com/posts/136994036 (this was also linked in the pinned comment on the youtube video)

sgerenser 10mo ago
The before/after on this just looks like compression artifacts/smoothing to me.
AnonHP 10mo ago
It must be my eyes and the small screen on my phone. I couldn’t find any differences in the video on Patreon, which was annoying enough to watch with the actual comparison clip being just a couple of seconds or so, and I had to rewind and check again. I wish it had shown more of the comparisons. Most of the current video was just commentary.
- gblargg 10mo ago
  Same here, on a big screen, I don't see anything notable. I really hope this isn't a mass delusion because YouTube started applying a sharpness ("edge enhancement") filter to videos to make them look sharper. It sure looks like that to me, because I hate this filter and how so many movie transfers have it added, with the ringing at the edges this filter leaves.
tetris11 10mo ago
I still can't see the differences in the patreon
- sgerenser 10mo ago
  It’s because you’re looking for some kind of “smoking gun” AI transformation. In reality it just looks like the YouTube one is more compressed and slightly blurred. Some people are apparently just learning that YouTube recompresses videos.
IshKebab 10mo ago
Yeah I also can't see the difference on the high quality video. I am on my phone though tbf. Also, minus 100 points to Jill for being happy about being able to use AI to automatically edit out all the silence from her videos. That's far more annoying than any barely perceptible visual artifacts. Why do people think wall-of-text videos are good?