Question / Help Cannot get lossless recording to work.

[Zyl]

Hello,

I want to record losslessly for later reencoding, but it does not work.

Here is 4x nearest neighbor upscale comparison between the YouTube logo as seen in my browser vs. as seen in playback of the recording with madVR:

As you can see, it's not 100% identical, i.e. not lossless.

Here are my settings (OBS 17.0.2):

What's wrong? (Am not too experienced with video encoding by the way)

 

[Zyl]

Bump

 

[Sapiens]

Looks like color space conversion. What color settings are configured under Settings > Advanced?

 

[Zyl]

Good call. It is set to NV12. I take it RGB is the way to go?

 

[Zyl]

Bump.

Also this appears to work for lossless only. Any other setups have the original problem again, regardless of how high bitrate is set.

 

[Zyl]

Bump.

 

[Deleted member 70571]

For colour settings, use RGB, Rec. 709 and full range.

 

[Suslik V]

Also, this post has some info: 709 vs 601, in short:

...
You can output RGB in Output Mode: Simple, Recording Quality: Lossless Quality;
and don't forget to specify in Advanced settings Color Format: RGB.

If you are looking for max settings with x264: Output Mode: Advanced;
at Recording tab set Rate Control: CRF, CRF: 0;
then try to specify in Advanced settings Color Format: I444, YUV Color Range: Full.
This is max settings for Studio's x264 recordings.

Spoiler: YUV Color Space setting

...
The OBS Studio streaming forces NV12 use (i.e. RGB-->YUV conversion present).

And make sure that you be able to edit and view such footage in the right way...

 

[Zyl]

So, it is not possible to record lossy compressed with RGB? (I444 looks much better though; thanks!)


What about compressed lossless? That'd be very effective for desktop recordings I imagine.

 

[Zyl]

What about compressed lossless?

Bump. I'd still like to know whether compressed lossless recording is achievable and if so, how.

 

[Suslik V]

...compressed lossless...

!?
More info on this, please...

 

[Zyl]

!?
More info on this, please...

Lossless, but still compressed, e.g. like the PNG file format for images. Is that not a thing?

 

[Deleted member 70571]

Seems like you're talking about CRF 0 on x264.

 

[Suslik V]

Lossless, but still compressed, e.g. like the PNG file format for images. Is that not a thing?

That is exactly what you are asking for:

...
You can output RGB in Output Mode: Simple, Recording Quality: Lossless Quality;
and don't forget to specify in Advanced settings Color Format: RGB.
...

 

[Zyl]

Oops! Went completely over my head that that already is compressed. Maybe I expected better results than is reasonable. Did the math again and it's good. Thanks for the help!