Why only Potplayer has that color problem?

[arbacaxi]

I tried some players but only PotPlayer has that color problem! I tried everything to solve it.

The red scale is showing like unsaturated on all videos. Red lasers in this concert turn it into oranges, for example. Thank you.

VLC:



POTPLAYER:



VLC:



POTPLAYER:

[jagabo]

rec.601 vs. rec.709 colors.
https://forum.videohelp.com/threads/329866-incorrect-collor-display-in-video-playback#post2045830

[arbacaxi]

rec.601 vs. rec.709 colors.
https://forum.videohelp.com/threads/329866-incorrect-collor-display-in-video-playback#post2045830

I tried before. I changed to "ITU-R BT.709", is this?

No changes.

[jagabo]

Try using a different Video Renderer in PotPlayer. Are you sure VLC has the right colors? On my computer VLC->OpenGL uses rec.709 for all HD videos, flagged or not. With the other renders it always uses rec.601. I'm running VLC version 2.2.4, not the most up to date.

[sheppaul]

What else players did you try as you're claiming potplayer is the only one having such a problem?

Is there any given sample to try?

[jagabo]

Here are some samples:

unflagged_rec709.mkv contains YUV 4:2:0 video with rec.709 colors, but the matrix isn't flagged
flagged_rec709.mkv contains YUV 4:2:0 video with rec.709 colors, flagged as rec.709
flagged_rec601.mkv contains YUV 4:2:0 video with rec.601 colors, flagged as rec.601

The RGB components of the color bars should be within 1 or 2 units of 0 or 191. Ie, the red bar should be 191,0,0 (r,g,b). The magenta bar should be about 191,0,191.



MPCHC on my computer displays all three with the correct colors. When the video doesn't specify the color matrix the general rule is to use rec.601 for SD video, rec.709 for HD video. Exactly what you see when you play these videos will vary depending on the player, the renderer the player is using, the graphics card you are using, and the graphics card's settings.

[arbacaxi]

Thanks guys for reply

What else players did you try as you're claiming potplayer is the only one having such a problem?

Is there any given sample to try?

I tried VLC, PotPlayer, KMPlayer, SMPlayer, MPC-BE today (the last one has the same color changes).

Here are some samples:

unflagged_rec709.mkv contains YUV 4:2:0 video with rec.709 colors, but the matrix isn't flagged
flagged_rec709.mkv contains YUV 4:2:0 video with rec.709 colors, flagged as rec.709
flagged_rec601.mkv contains YUV 4:2:0 video with rec.601 colors, flagged as rec.601

The RGB components of the color bars should be within 1 or 2 units of 0 or 191. Ie, the red bar should be 191,0,0 (r,g,b). The magenta bar should be about 191,0,191.


[Attachment 41974 - Click to enlarge]

MPCHC on my computer displays all three with the correct colors. When the video doesn't specify the color matrix the general rule is to use rec.601 for SD video, rec.709 for HD video. Exactly what you see when you play these videos will vary depending on the player, the renderer the player is using, the graphics card you are using, and the graphics card's settings.

Hi thanks, I have on VLC the same things on unflagged_rec709.mkv and flagged_rec709.mkv (red bar 191,0,1). flagged_rec601.mkv looks a bit orange (red bar 208,8,0)

On PP I have all the 'same' colors (imperceptible), but flagged_rec601.mkv show the grays a bit more bright
unflagged_rec709 red bar 190,0,0
flagged_rec709 red bar 190,0,0
flagged_rec601.mkv red bar 191,0,1

I tried some Video Renderers and there's no changes...

[jagabo]

Hi thanks, I have on VLC the same things on unflagged_rec709.mkv and flagged_rec709.mkv (red bar 191,0,1). flagged_rec601.mkv looks a bit orange (red bar 208,8,0)

So VLC is displaying all HD video with a rec.709 matrix, even if the video is flagged rec.601.

On PP I have all the 'same' colors (imperceptible), but flagged_rec601.mkv show the grays a bit more bright
unflagged_rec709 red bar 190,0,0
flagged_rec709 red bar 190,0,0
flagged_rec601.mkv red bar 191,0,1

So PotPlayer is following the flagged matrix and assuming rec.709 when the matrix isn't flagged.

[arbacaxi]

So, looking with more attention with prints screens and the videos you sent, when I change PotPlayer to "Haali Video Renderer" I got the same colors of VLC, but when I put the two players with "OpenGL" they show the same colors like Potplayer's images I've upload above (in that case, PP has no changes, only VLC).

I don't understand this very well, what is "correct"? Haali Video Renderer, I suppose? Thank you (and sorry, I have to calibrate my english, hope you understand)

[sheppaul]

He means that VLC does not correctly display flagged_rec601.mkv by default.

[sheppaul]

This is what I picked color values of RGB for red bar using pickpick.

Potplayer (video renderer = auto, evr c/p), v1.7.2493
flagged_rec601 / 191, 0, 0
flagged_rec709 / 191, 0, 0
unflagged_rec709 / 191, 0, 0


mpc-hc with madVR (slightly varying), v1.7.11.36
flagged_rec601 / 191, 0, 1
flagged_rec709 / 192, 0, 1
unflagged_rec709 / 191, 0, 1


VLC (video renderer = auto, probably direct3d), v2.2.6
flagged_rec601 / 194, 32, 14
flagged_rec709 / 180, 16, 16
unflagged_rec709 / 180, 16, 16


VLC (video renderer = OpenGL), v2.2.6
flagged_rec601 / 208, 18, 0
flagged_rec709 / 191, 0, 1
unflagged_rec709 / 191, 0, 1



I double checked as the results are rather weird. There should be a way to correct it in preferences of VLC but you should not use VLC in windows at least by default.

ps. Thanks for the samples. I tried MPC-BE (all 191, 0, 0), MPV (all 191, 0, 1) and the results were the same as Potplayer. Clearly, the correct one is potplayer.

[jagabo]

He means that VLC does not correctly display flagged_rec601.mkv by default.

I'm not sure what the default renderer is when you first install VLC. But whether you get the "right" colors depends on which renderer is used and what matrix was used to create the video. On my computer VLC with the OGL renderer always uses a rec.709 matrix. So rec.709 videos are displayed correctly, rec.601 videos are displayed incorrectly. On the other hand, the Direct3d, DirectX, Direct2D, and Windows GDI renders always use rec.601. So rec.709 videos are displayed incorrectly, rec.601 videos are displayed correctly. So, on my computer, there is no renderer in VLC 2.2.4 that will display all HD videos correctly. But there are several other factors which may cause other computers to behave differently: different version of VLC, different settings in VLC (accelerated video output, hardware YUV->RGB conversion, etc.), different graphics cards (with most renderer's YUV data is passed tot the graphics card and the graphics card performs the YUV to RGB conversion, Windows GDI is the exception, when using it VLC converts YUV to RGB and then passes RGB data to the graphics card), different graphics card drivers, different settings in those drivers, different codecs and different containers. I also haven't tested SD videos.

I hesitate to say a lot about PotPlayer because the version I'm using is four years old. It's behavior is likely to have changed since then.

[sheppaul]

BTW, there is something strange. Is it correct to get a same rgb value for flagged_rec601.mkv ?
See the last result of VLC with openGL renderer. Which one is correct? VLC is the only one displaying rec601_flagged video correctly?

If the video is tagged with rec601, what should be rgb values? What values did you get from MPC-HC with flagged_rec601.mkv, jagabo?

[sheppaul]

I did some more test with VLC 3.0 nightly build and found something different.

VLC (video renderer = directly set to direct3d), v3.0 Nightly, No changes
flagged_rec601 / 194, 32, 14
flagged_rec709 / 180, 16, 16
unflagged_rec709 / 180, 16, 16


VLC (video renderer = OpenGL), v3.0 Nightly
flagged_rec601 / 191, 0, 1
flagged_rec709 / 191, 0, 1
unflagged_rec709 / 191, 0, 1



I'm just wondering if it is corrected or it is not recognized correctly.

[jagabo]

Is it correct to get a same rgb value for flagged_rec601.mkv ?

All three videos should give the same RGB colors (within 1 or 2 units on each primary due to rounding errors in the YUV to RGB conversion) at playback. The rec.601 video used rec.601 to convert from the original RGB to YUV and using a rec.601 matrix to convert back to RGB should give the original colors.

[sheppaul]

Ok, I got confused. Thank you for the clarification.

[sheppaul]

VLC (video renderer = directly set to direct3d), v3.0 Nightly, No changes
flagged_rec601 / 194, 32, 14
flagged_rec709 / 180, 16, 16
unflagged_rec709 / 180, 16, 16

Found something interesting, these values are exactly same as in VMR 9 Renderless of potplayer.
Direct3D renderer of VLC should be something like this.



So if you like colors in VLC, you can try VMR 9 Renderless.

[Flavio S]

Guys, I found the solution. In PotPlayer change the render to Built-in OpenGL Render.

[tpassofaro]

I made an account just to add my solution to this just in case someone else needs it. Under pixel shaders, check "Remap_16_235" and I found my video now matches what VLC and other players are showing. I also found "BT601BT709" also helped it get closer, but seemed to not quite be my issue. However, someone with a similar "video gamma seems off" issue might find that to be the fix.