Avidemux 2.7.8 - encoder HEVC (x265) too slow?

[phaolo]

I tried encoding a clip of 5mins to Hevc x265 in Avidemux, but it took like 30mins.
I then tried Handbrake with similar settings and it managed to do the full 45min video in something more than 1h.
Is there some problem with the encoder in Avidemux?

[szlldm]

IMHO it must be that similar != same. Both Handbrake and Avidemux use ffmpeg libraries for encoding.

[eumagga0x2a]

Assuming that Handbrake uses x265 (either directly like Avidemux or indirectly via libavcodec), compare the output of mediainfo regarding the x265 version (you could post both mediainfo reports here). It is possible that Handbrake uses a more recent version of the x265 library.

However, encoding with x265 at a speed near real time is possible only with an absolutely top-notch hardware or with a preset sacrificing quality for speed. I hardly ever get two-digit frame rates with a 720p source when encoding to HEVC using x265.

[phaolo]

Mm.. maybe it's my fault, because I wanted to set a GOP min=30 max=60.
But to do that in Avidemux you have to use Advanced Config, and that disables the presets.
In Handbrake you can keep the presets and then just add parameters for keyint.

How do you even setup a "veryfast" method in Avidemux with adv config?

[eumagga0x2a]

I wanted to set a GOP min=30 max=60.
But to do that in Avidemux you have to use Advanced Config, and that disables the presets.

I'll need to investigate untying GOP size from advanced config.

How do you even setup a "veryfast" method in Avidemux with adv config?

If https://www.ramugedia.com/rate-control-of-x265 is valid, "veryfast" matches a x265 command line

Code Select Expand

-b-adapt 0 -b 4 --tu-inter-depth=1 --tu-intra-depth=1 --rd 0 --subme=1 --me=1 --max-merge=2  --no-amp --no-rect --no-tskip --early-skip
But this would be clumsy way to achieve this. Instead, if enforcing GOP size limits can coexist with presets, the corresponding controls need to be made accessible in the simple / non-advanced mode.

[phaolo]

But this would be clumsy way to achieve this. Instead, if enforcing GOP size limits can coexist with presets, the corresponding controls need to be made accessible in the simple / non-advanced mode.

OMG I hope so..
Btw in case you'll manage to do it, could you add the setting like OBS does?
It allows a keyint in seconds and it's quite convenient because you won't have to check the video's framerate.

[eumagga0x2a]

Btw in case you'll manage to do it, could you add the setting like OBS does?
It allows a keyint in seconds and it's quite convenient because you won't have to check the video's framerate

I would call this a minor inconvenience.