insert video filter

Skaperen · 05-03-2021, 06:36 PM

i would like to find out if this is possible and how to do it if so. i want to create (in C) a video filter that goes between Firefox or maybe even Mplayer and the library calls or kernel interface to fix some poor quality (dark, bad color temp., bad white balance) while i am watching the video. or maybe it is better to write or mod a player to do this. several websites have these issues (so, solution cannot be website specific). any ideas?

pan64 · 05-04-2021, 10:49 AM

copy link from firefox and use a player which can do what you need.

teckk · 05-04-2021, 05:26 PM

Quote:

Firefox or maybe even Mplayer
...
to fix some poor quality (dark, bad color temp.

Make video lighter

~/.mplayer

Code:

vf=eq=10

Or

Code:

mplayer -vf eq=10 file.mp4

Change the sound, example:

Code:

mplayer -af equalizer=-5:-5:-5:0:0:0:0:0:12:12 file.mp4

[brightness|contrast|hue|saturation]=<-100-100>

Skaperen · 05-13-2021, 08:31 PM

Quote:

Originally Posted by pan64

copy link from firefox and use a player which can do what you need.

i looked for such a player and found nothing. ffmpeg and friends can make such changes but they need the user to have the URL. maybe this should be a firefox feature. it would mean being able to set all the color parameters (at least 27 of them, how every color affects every color in several ways).

or maybe it should be a standardized user API/ABI for video drivers, though it would be nice to have web sit specific parameter sets to pick.

Skaperen · 05-13-2021, 08:34 PM

mplayer is lousy at web browsing. do you know of anyone that uses it for such like on YouTube?

teckk · 05-14-2021, 09:46 AM

ffmpeg and friends can make such changes but they need the user to have the URL

Code:

a=$(youtube-dl -g -f 18 https://m.youtube.com/watch?v=3IJ2ZwaCvE8) 
ffprobe "$a"
...
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Google
  Duration: 00:58:46.37, start: 0.000000, bitrate: 545 kb/s
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x360 [SAR 1:1 DAR 16:9], 447 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]

Quote:

mplayer is lousy at web browsing

I don't know what you mean by that. Mplayer won't browse the web at all. You need to feed it something.

Quote:

do you know of anyone that uses it for such like on YouTube?

Yes, for about 15 years now. Not by itself, you need to make a script to automate it.

ondoho · 05-14-2021, 01:22 PM

Quote:

Originally Posted by Skaperen

i looked for such a player and found nothing.

mplayer obviously can, as teckk showed you.
mpv can too, even in real time (1234567890 keys).

Skaperen · 05-14-2021, 07:22 PM

i think you guys did not catch on to the fact that i want to teak video color correction while viewing a video as part of browsing the web. downloading a video a fixing it to view is already doable. i want to do it while view the video in the web browser. i prefer Firefox but i am open to try another web browser (except Chrome). the idea way to do this might be a right click (on the video) menu and select color correction which brings up a color correct menu. it would include options to apply to videos, images, and/or HTML. another option would be to save it for this object URL, this page URL, this site host name, this site domain name, everything. and another option would be to give it a custom name to choose when to use that one (among others).

ondoho · 05-15-2021, 12:06 AM

Quote:

Originally Posted by Skaperen

i think you guys did not catch on to the fact that i want to teak video color correction while viewing a video as part of browsing the web. downloading a video a fixing it to view is already doable. i want to do it while view the video in the web browser. i prefer Firefox but i am open to try another web browser (except Chrome). the idea way to do this might be a right click (on the video) menu and select color correction which brings up a color correct menu. it would include options to apply to videos, images, and/or HTML. another option would be to save it for this object URL, this page URL, this site host name, this site domain name, everything. and another option would be to give it a custom name to choose when to use that one (among others).

Well, you have a nice outline there for how to design that browser plugin.
Because I doubt something like that exists already, being so specialised and inflexible.
I mean, WHY does it have to be in the browser...

Also I assume you already searched browser addon/plugin sites, otherwise you wouldn't be asking this question, right?

Skaperen · 05-18-2021, 06:22 PM

Quote:

Originally Posted by ondoho

WHY does it have to be in the browser

it doesn't. that's just the first common place where the video content goes through. and it's still userland. the next place is the kernel (unless the browser sends it somewhere else but i don't know of any place like that for video. if i was doing just audio, pulse audio would be the next place. but i wand to keep this in userland.

ondoho · 05-20-2021, 12:20 AM

Quote:

Originally Posted by Skaperen

it doesn't. that's just the first common place where the video content goes through. and it's still userland. the next place is the kernel (unless the browser sends it somewhere else but i don't know of any place like that for video. if i was doing just audio, pulse audio would be the next place. but i wand to keep this in userland.

I think you are deeply confused about how some things work on your system - maybe you don't understand that streaming does not require a browser?
Combined with an unwillingness to lay bare your situation in full detail. Your descriptions are always somewhat - wary?