Simple hardware encoding (#3419)

* HW Accel
* CUDA Docker build and adjust the NVENC encoder
* Removed NVENC preset

Using legacy presets is removed in SDK 12 and deprecated since SDK 10.
This commit removed the preset to allow ffmpeg to select the default one.

---------

Co-authored-by: Nodude <>
Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

ui/v2.5/src/docs/en/Changelog/v0200.md

@@ -1,6 +1,7 @@
 ##### 💥 Note: The cache directory is now required if using HLS streaming. Please set the cache directory in the System Settings page.
 
 ### ✨ New Features
+* Added hardware acceleration support (for a limited number of encoders) for transcoding. ([#3419](https://github.com/stashapp/stash/pull/3419))
 * Added support for DASH streaming. ([#3275](https://github.com/stashapp/stash/pull/3275))
 * Added configuration option for the maximum number of items in selector drop-downs. ([#3277](https://github.com/stashapp/stash/pull/3277))
 * Added configuration option to perform generation operations sequentially after scanning a new video file. ([#3378](https://github.com/stashapp/stash/pull/3378))

ui/v2.5/src/docs/en/Manual/Configuration.md

@@ -77,6 +77,10 @@ This setting can be used to increase/decrease overall CPU utilisation in two sce
 
 Note: If this is set too high it will decrease overall performance and causes failures (out of memory).
 
+## Hardware Accelerated Live Transcoding
+
+Hardware accelerated live transcoding can be enabled by setting the `FFmpeg hardware encoding` setting. Stash outputs the supported hardware encoders to the log file on startup at the Info log level. If a given hardware encoder is not supported, it's error message is logged to the Debug log level for debugging purposes.
+
 ## HLS Streaming
 
 If using HLS streaming (such as on Apple devices), the Cache path must be set. This directory is used to store temporary files during the live-transcoding process. The Cache path can be set in the System settings page.