feat(all): transcoding improvements (#2171)

* test: rename some fixtures and add text for vertical video conversion

* feat: transcode video asset when audio or container don't match target

* chore: add niceness to the ffmpeg command to allow other processes to be prioritised

* chore: change video conversion queue to one concurrency

* feat: add transcode disabled preset to completely turn off transcoding

* linter

* Change log level and remove unused await

* opps forgot to save

* better logging

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

web/src/api/open-api/api.ts

@@ -2046,7 +2046,8 @@ export interface SystemConfigFFmpegDto {
 export const SystemConfigFFmpegDtoTranscodeEnum = {
     All: 'all',
     Optimal: 'optimal',
-    Required: 'required'
+    Required: 'required',
+    Disabled: 'disabled'
 } as const;
 
 export type SystemConfigFFmpegDtoTranscodeEnum = typeof SystemConfigFFmpegDtoTranscodeEnum[keyof typeof SystemConfigFFmpegDtoTranscodeEnum];