feat(server): transcode bitrate and thread settings (#2488)

* support for two-pass transcoding

* added max bitrate and thread to transcode api

* admin page setting desc+bitrate and thread options

* Update web/src/lib/components/admin-page/settings/setting-input-field.svelte

Co-authored-by: Michel Heusschen <59014050+michelheusschen@users.noreply.github.com>

* Update web/src/lib/components/admin-page/settings/setting-input-field.svelte

Co-authored-by: Michel Heusschen <59014050+michelheusschen@users.noreply.github.com>

* two-pass slider, `crf` and `threads` as numbers

* updated and added transcode tests

* refactored `getFfmpegOptions`

* default `threads`, `maxBitrate` now 0, more tests

* vp9 constant quality mode

* fixed nullable `crf` and `threads`

* fixed two-pass slider, added apiproperty

* optional `desc` for `SettingSelect`

* disable two-pass if settings are incompatible

* fixed test

* transcode interface

---------

Co-authored-by: Michel Heusschen <59014050+michelheusschen@users.noreply.github.com>

server/immich-openapi-specs.json

@@ -5349,7 +5349,10 @@
         "type": "object",
         "properties": {
           "crf": {
-            "type": "string"
+            "type": "integer"
+          },
+          "threads": {
+            "type": "integer"
           },
           "preset": {
             "type": "string"
@@ -5363,6 +5366,12 @@
           "targetResolution": {
             "type": "string"
           },
+          "maxBitrate": {
+            "type": "string"
+          },
+          "twoPass": {
+            "type": "boolean"
+          },
           "transcode": {
             "type": "string",
             "enum": [
@@ -5375,10 +5384,13 @@
         },
         "required": [
           "crf",
+          "threads",
           "preset",
           "targetVideoCodec",
           "targetAudioCodec",
           "targetResolution",
+          "maxBitrate",
+          "twoPass",
           "transcode"
         ]
       },