refactor(server): modularize getFfmpegOptions (#3138)

* refactored `getFfmpegOptions`

refactor transcoding, make separate service

* fixed enum casing

* use `Logger` instead of `console.log`

* review suggestions

* use enum for `getHandler`

* fixed formatting

* Update server/src/domain/media/media.util.ts

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

* Update server/src/domain/media/media.util.ts

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

* More specific imports, renamed codec classes

* simplified code

* removed unused import

* added tests

* added base implementation for bitrate and threads

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

server/src/domain/system-config/system-config.service.spec.ts

@@ -1,4 +1,11 @@
-import { SystemConfig, SystemConfigEntity, SystemConfigKey, TranscodePreset } from '@app/infra/entities';
+import {
+  AudioCodec,
+  SystemConfig,
+  SystemConfigEntity,
+  SystemConfigKey,
+  TranscodePolicy,
+  VideoCodec,
+} from '@app/infra/entities';
 import { BadRequestException } from '@nestjs/common';
 import { newJobRepositoryMock, newSystemConfigRepositoryMock, systemConfigStub } from '@test';
 import { IJobRepository, JobName, QueueName } from '../job';
@@ -28,12 +35,12 @@ const updatedConfig = Object.freeze<SystemConfig>({
     crf: 30,
     threads: 0,
     preset: 'ultrafast',
-    targetAudioCodec: 'aac',
+    targetAudioCodec: AudioCodec.AAC,
     targetResolution: '720',
-    targetVideoCodec: 'h264',
+    targetVideoCodec: VideoCodec.H264,
     maxBitrate: '0',
     twoPass: false,
-    transcode: TranscodePreset.REQUIRED,
+    transcode: TranscodePolicy.REQUIRED,
   },
   oauth: {
     autoLaunch: true,