Avidemux Forum

[Feature Request] Add fine-grained x265 GUI controls for --deblock, --sao, and --sao-non-deblock

Hi team,

I would like to request an enhancement for the x265 video encoder GUI in Avidemux regarding the Deblock and SAO (Sample Adaptive Offset) settings.

Currently, the GUI only provides basic toggle options (checkboxes) to disable these filters, but lacks fine-tuning parameters that are crucial for specific encoding scenarios (such as capturing interlaced analog video sources, tape digitizations, or lower-bitrate DVB streams).

---

Missing / Limited Settings:

1. Deblock Filter (--deblock)

• Current state: Only available as a binary toggle/checkbox (Disable Deblock).

• Requested feature: Expose the two offset parameters Alpha (tcOffset) and Beta (betaOffset).

• Corresponding FFmpeg / x265 CLI parameters:
-x265-params deblock=<cbOffset>:<crOffset> (e.g. -x265-params deblock=-1:-1)
2. Sample Adaptive Offset (--sao)   

• Current state: Only available as a binary toggle/checkbox (Disable SAO).

• Requested feature: Allow further customization of SAO behavior (e.g. mode selection, limit-sao, or custom thresholds) instead of just a global ON/OFF switch.

• Corresponding FFmpeg / x265 CLI parameters:
-x265-params sao=1 / sao=0 and -x265-params limit-sao=1
3. SAO Non-Deblock Handling (--sao-non-deblock)   

• Current state: Missing completely from the GUI.

• Requested feature: Add a toggle/setting to specify how SAO handles dependency on deblocked edge pixels.

• Corresponding FFmpeg / x265 CLI parameters:   
-x265-params sao-non-deblock=1 / sao-non-deblock=0

---

Exposing numerical inputs and toggles for these settings in the x265 plugin configuration (and storing them in the plugin JSON config) would give users precise control over fine details and prevent blurring/banding artifacts without relying on external scripts or CLI runs.

Thank you very much for considering this improvement!
And also thanks a lot for your continuous hard work on Avidemux and for keeping this awesome tool alive over all these years!

Best regards,
Manfred

Thank-you.

Just for my own satisfaction, I reproduced the freeze-up on the first try.

Quote from: eumagga0x2a on October 02, 2026, 08:13:17 PMPlease disable AVX and AVX2 SIMD in Avidemux Preferences --> CPU and report back whether this helps.

This worked, Sep 22 nightly did not freeze-up.

Going forward, should AVX and AVX2 be kept disabled, or is that just for a temporary fix?

Please disable AVX and AVX2 SIMD in Avidemux Preferences --> CPU and report back whether this helps.

I have seen this intermittent FFmpeg crash encoding audio to AC3 too, thank you for the log. Not related to x264 or anything else.

Quote from: Rainman74 on October 02, 2026, 09:04:45 AMSince avidemux_mingw64_20260912 & 20260922, the nvenc encoders no longer work and throw an error.

May be related to graphics drivers being too old, in doubt please reproduce the issue, close Avidemux and provide admlog.txt from %localappdata%\avidemux directory.

Quote from: MC on September 30, 2026, 06:21:45 AMAlso, as ffmpeg already support faac audio, that's a good idea to have two aac encoder/decoder ?

We have three and the only one which really matters feature-wise is fdk_aac (non-free). Absolutely no objections at least on my part when duplicate functionality like faac AAC encoder and faad2 AAC decoder are left out. Regarding having multiple tools to do the same job, I personally don't see a problem with that, may be useful for testing.

Mister Developer, could it be possible for you in Avidemux to add a separate default folder for audio that is used for selecting the track from and save a track to, please? I keep both video and audio separated, this feature would make my workflow more comfortable. Thanks a lot in advance.
Kind regards from Litze.

Up to at least version 2.5.6, the x264 codec was much more configurable:

- the three *qcomp* (curve compression) values ��are now fixed and cannot be modified
- *zones* can no longer be set

(ver. 2.5.6)
You cannot view this attachment.You cannot view this attachment. 



Now (ver. 2.8.x)

You cannot view this attachment.You cannot view this attachment.

Why were they disabled? 

It would be great if at least these two options were made functional and user-adjustable again, as they were in older versions.

Xvid is also much less configurable than before: at the very least, AQ and PB-ratio should be adjustable, as these are important parameters.

Thanks.

Since avidemux_mingw64_20260912 & 20260922, the nvenc encoders no longer work and throw an error.

The Sep 22 nightly has given multiple freeze-ups when using x264.
First last week after updating from the Sep 12 nightly and again this week after doing a clean install.
Last week and this week I rolled back to the Aug 6 nightly, same files, same workflows, no problems.
The Sep 12 also was problem free for the week I used it.

Maybe you can see something in the attached crash.py and admlog.

https://drive.google.com/file/d/1g133aSIetKL17zO4V37gcR_6IPZeC5qc/view?usp=sharing

https://drive.google.com/file/d/1XtiTp0Q1WO-njB70BDyNhYfh1kj44Irs/view?usp=sharing