How exactly do you use the --extra-encoder-option

[dhow]

Hello!

Recently I've been playing with video2x to convert some of my favorite shows -- very impressive results btw 👍 -- and now I'm looking to do more with it, in particular, feeding custom ffmpeg options to it, for example, vbr encoding using the the hevc_nvenc encoder.

However, not sure if I've read the documentation right or if I understand correctly, I don't seem to get it right -- my options seem to have no effect to the output. In following example, If I were to feed ffmpeg with theese options:

• -rc vbr -b:v 2M -maxrate 4M -bufsize 8M -vf "crop=w:h-2*164:0:164"

I would think that I need to feed video2x with theese options:

• --extra-encoder-option rc=vbr --extra-encoder-option b:v=2M --extra-encoder-option maxrate=4M --extra-encoder-option bufsize=8M --extra-encoder-option 'vf=crop=w:h-2*164:0:164'

But from the log it says [warning] Failed to set encoder option xxx: Option not found -- this is weird, because if it's extra encoder options that we're trying to give ffmpeg, video2x really shouldn't care what options are given anyway.

Also noted that I tried to crop input using the -vf "crop=w:h-2*164:0:164" option. As there's already an = sign in this option, how do you pass this kind of options over to video2x? I was imagine there must be some ways to escpae characters, but no joy after several guesses.

If someone could point out how exactly should we use the --extra-encoder-option option, that would be great!

Q:\work>"C:\Program Files\Video2X Qt6\video2x.exe" -i "Q:\work\input.mkv" -o "Q:\work\output.rife.mkv"  -m 4 -p rife --rife-model rife-v4.6 -c hevc_nvenc --extra-encoder-option rc=vbr --extra-encoder-option b:v=2M --extra-encoder-option maxrate=4M --extra-encoder-option bufsize=8M --extra-encoder-option 'vf=crop=w:h-2*164:0:164'
[2025-02-21 19:43:14] [info] Video2X version 6.4.0
[2025-02-21 19:43:14] [info] Processing file: Q:\work\input.mkv
[2025-02-21 19:43:14] [info] Using Vulkan device: NVIDIA GeForce RTX 3060 Ti (0x2486)
[2025-02-21 19:43:14] [info] Press [space] to pause/resume, [q] to abort.
[2025-02-21 19:43:14] [warning] Failed to set encoder option 'b:v' to '2M': Option not found
[2025-02-21 19:43:14] [warning] Failed to set encoder option 'maxrate' to '4M': Option not found
[2025-02-21 19:43:14] [warning] Failed to set encoder option 'bufsize' to '8M': Option not found
[2025-02-21 19:43:14] [warning] Failed to set encoder option ''vf' to 'crop=w:h-2*164:0:164'': Option not found
[2025-02-21 19:43:15] [warning] Skipping unsupported stream type at index: 4
[0 NVIDIA GeForce RTX 3060 Ti]  queueC=2[8]  queueG=0[16]  queueT=1[2]
[0 NVIDIA GeForce RTX 3060 Ti]  bugsbn1=0  bugbilz=0  bugcopc=0  bugihfa=0
[0 NVIDIA GeForce RTX 3060 Ti]  fp16-p/s/u/a=1/1/1/1  int8-p/s/u/a=1/1/1/1
[0 NVIDIA GeForce RTX 3060 Ti]  subgroup=32  basic/vote/ballot/shuffle=1/1/1/1
[0 NVIDIA GeForce RTX 3060 Ti]  fp16-8x8x16/16x8x8/16x8x16/16x16x16=0/1/1/1
[2025-02-21 19:43:15] [warning] Estimating the total number of frames using duration * fps
frame=39/735284 (0.01%); fps=19.50; elapsed=00:00:02; remaining=10:28:24

[k4yt3x]

I'll write a guide on this either today or tomorrow. I think this is currently under-explained.

[dhow]

Thanks so much @k4yt3x !!

[k4yt3x]

Take a look at: https://docs.video2x.org/running/command-line.html#encoder-options

Feel free to keep adding comments here if you still have questions.