Avidemux Forum

Quote from: eumagga0x2a on June 03, 2026, 03:42:20 PMPresumably due to HDR -> SDR conversion, given the source video has color depth > 8 bit. There are various HDR tone mapping algorithms in the Video menu available, none perfect and all unaccelerated (performed on the CPU). Please try playing with settings to reduce saturation.

Tried to change it but to no real improvements. As of now I need to use Handbrake to have the correct colors and rotating it to portrait mode so Avidemux recognizes it properly.

Quote from: MarcusDeMan on June 02, 2026, 05:52:25 PMDoes this happen because of the video decoder (Lavcodec RGB)?

Not in this case.

Quote from: eumagga0x2a on June 03, 2026, 03:42:20 PMUnrelated: please consider switching from unaccelerated fallback "Qt" video display, indicated by the "RGB" label (it looks like you are using a pretty old Avidemux build as current 2.8.2 builds display information about decoder and display in the status bar) to a better option (all other options are better). The best and also the default video display in Avidemux on Windows is "DXVA2" (actually DirectX).

I did have build 2.8.1 and didn't even know that there was 2.8.2. Just installed it and the preferences showed that I was already on "DXVA2".

Quote from: sark on June 03, 2026, 04:15:53 PM

Quote from: MarcusDeMan on June 03, 2026, 01:22:23 PMHowever, I mean the main editing window still shows the video in landscape mode even after adding this rotation filter.

If you enable the button to the right of the info (i) button in the main window, you can playback with filter rotation applied.
Unfortunately, this only works during playback, so is not practical for frame by frame editing.

Great tip! Didn't know about this feature.

However, as you stated it is not practical for frame by frame editing.

As of now I convert the videos with handbrake to portrait mode. It is annoying for needing to do an extra step and therefore decreasing the IQ of the original video but it is what it is.

Quote from: eumagga0x2a on June 03, 2026, 03:23:37 PM

Quote from: MarcusDeMan on June 02, 2026, 05:54:39 PMI wanted to know if there is a way to rotate the preview video?

No. The feature is on the nice-to-have list.

Thank you for your reply and I hope this nice-to-have feature will be implemented soon.

As I see more and more people use their phone to make video's. But maybe they use other video editors to edit their footage as opposed to me wanting to do that on a desktop pc.

Quote from: MarcusDeMan on June 03, 2026, 01:22:23 PMHowever, I mean the main editing window still shows the video in landscape mode even after adding this rotation filter.

If you enable the button to the right of the info (i) button in the main window, you can playback with filter rotation applied.
Unfortunately, this only works during playback, so is not practical for frame by frame editing.

Presumably due to HDR -> SDR conversion, given the source video has color depth > 8 bit. There are various HDR tone mapping algorithms in the Video menu available, none perfect and all unaccelerated (performed on the CPU). Please try playing with settings to reduce saturation.

Quote from: MarcusDeMan on June 02, 2026, 05:52:25 PMDoes this happen because of the video decoder (Lavcodec RGB)?

Not in this case.

Unrelated: please consider switching from unaccelerated fallback "Qt" video display, indicated by the "RGB" label (it looks like you are using a pretty old Avidemux build as current 2.8.2 builds display information about decoder and display in the status bar) to a better option (all other options are better). The best and also the default video display in Avidemux on Windows is "DXVA2" (actually DirectX).

Quote from: MarcusDeMan on June 02, 2026, 05:54:39 PMI wanted to know if there is a way to rotate the preview video?

No. The feature is on the nice-to-have list.

Quote from: MarcusDeMan on June 02, 2026, 05:54:39 PMWhen capturing videos in portrait mode, avidemux shows / rotating them in landscape orientation.

Yes, by design, showing as coded and with square pixels, not applying any transformations either from container metadata or codec (except for crop directives from VUI, of course).

Hi Sark,

Thank you for your reply.

However, I mean the main editing window still shows the video in landscape mode even after adding this rotation filter.

I now use MKVToolnix to convert all my M2TS files to MKV before opening in any editing app. This has solved a number of issues with various apps I use, incluing Avidemux.

I've seen a few odd issues disappear after remuxing the source file first with a tool like ffmpeg and then opening the new file in Avidemux. Sometimes the container metadata is the culprit rather than the video stream itself. Might be worth a quick test if you haven't tried it already.

If you set The Transform/Rotate filter to rotate the video, filter previews will display rotated.

If you click the button to the right of the Info button, below the menu bar (a green dot should appear to confirm on), main window playback will show rotation (though not when paused).

You can disable or delete the Rotate filter before exporting if desired.