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authorChocobozzz <me@florianbigard.com>2023-04-21 14:55:10 +0200
committerChocobozzz <chocobozzz@cpy.re>2023-05-09 08:57:34 +0200
commit0c9668f77901e7540e2c7045eb0f2974a4842a69 (patch)
tree226d3dd1565b0bb56588897af3b8530e6216e96b /server/helpers/ffmpeg/framerate.ts
parent6bcb854cdea8688a32240bc5719c7d139806e00b (diff)
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Implement remote runner jobs in server
Move ffmpeg functions to @shared
Diffstat (limited to 'server/helpers/ffmpeg/framerate.ts')
-rw-r--r--server/helpers/ffmpeg/framerate.ts44
1 files changed, 44 insertions, 0 deletions
diff --git a/server/helpers/ffmpeg/framerate.ts b/server/helpers/ffmpeg/framerate.ts
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+++ b/server/helpers/ffmpeg/framerate.ts
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1import { VIDEO_TRANSCODING_FPS } from '@server/initializers/constants'
2import { VideoResolution } from '@shared/models'
3
4export function computeOutputFPS (options: {
5 inputFPS: number
6 resolution: VideoResolution
7}) {
8 const { resolution } = options
9
10 let fps = options.inputFPS
11
12 if (
13 // On small/medium resolutions, limit FPS
14 resolution !== undefined &&
15 resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN &&
16 fps > VIDEO_TRANSCODING_FPS.AVERAGE
17 ) {
18 // Get closest standard framerate by modulo: downsampling has to be done to a divisor of the nominal fps value
19 fps = getClosestFramerateStandard({ fps, type: 'STANDARD' })
20 }
21
22 // Hard FPS limits
23 if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = getClosestFramerateStandard({ fps, type: 'HD_STANDARD' })
24
25 if (fps < VIDEO_TRANSCODING_FPS.MIN) {
26 throw new Error(`Cannot compute FPS because ${fps} is lower than our minimum value ${VIDEO_TRANSCODING_FPS.MIN}`)
27 }
28
29 return fps
30}
31
32// ---------------------------------------------------------------------------
33// Private
34// ---------------------------------------------------------------------------
35
36function getClosestFramerateStandard (options: {
37 fps: number
38 type: 'HD_STANDARD' | 'STANDARD'
39}) {
40 const { fps, type } = options
41
42 return VIDEO_TRANSCODING_FPS[type].slice(0)
43 .sort((a, b) => fps % a - fps % b)[0]
44}