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This commit is contained in:
Andras Schmelczer 2026-05-06 22:40:46 +01:00
parent 28323f145e
commit 94f9c0d594
76 changed files with 3238 additions and 1230 deletions
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19
video/src/video.ts
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@ -1,12 +1,6 @@
import { execSync } from 'node:child_process';
import { renameSync, statSync } from 'node:fs';
import {
MAX_DURATION_S,
OUTPUT_FPS,
RECORD_SCALE,
VIDEO_SIZE,
WEBM_BITRATE,
} from './config.js';
import { MAX_DURATION_S, OUTPUT_FPS, VIDEO_SIZE, WEBM_BITRATE } from './config.js';
const LEAD_IN_S = 0.12;
@ -18,11 +12,11 @@ export function trimRecording(
const sceneSpan = (times.sceneEndMs - times.sceneStartMs) / 1000;
const trimStart = Math.max(
0,
(times.sceneStartMs - times.recordStartMs) / 1000 - LEAD_IN_S * RECORD_SCALE
(times.sceneStartMs - times.recordStartMs) / 1000 - LEAD_IN_S
);
const trimEnd = (times.sceneEndMs - times.recordStartMs) / 1000;
const wallDuration = trimEnd - trimStart;
const finalDuration = wallDuration / RECORD_SCALE;
const finalDuration = wallDuration;
if (finalDuration > MAX_DURATION_S) {
console.log(
@ -32,12 +26,11 @@ export function trimRecording(
const filter =
`trim=start=${trimStart.toFixed(3)}:duration=${wallDuration.toFixed(3)},` +
`setpts=(PTS-STARTPTS)/${RECORD_SCALE},fps=${OUTPUT_FPS},` +
`setpts=PTS-STARTPTS,fps=${OUTPUT_FPS},` +
`trim=duration=${finalDuration.toFixed(3)},setpts=PTS-STARTPTS`;
// Keep trimming inside the filter graph: it is frame-accurate for WebM
// without the keyframe leakage of input seeking or the post-speedup timing
// ambiguity of output seeking.
// without the keyframe leakage of input seeking.
execSync(
`ffmpeg -y -i "${rawPath}" -vf "${filter}" ` +
`-fps_mode cfr -r ${OUTPUT_FPS} -c:v libvpx -b:v ${WEBM_BITRATE} -deadline good -cpu-used 5 ` +
@ -53,6 +46,6 @@ export function trimRecording(
}
console.log(
`Wrote ${trimmedPath} (${finalDuration.toFixed(2)}s, scene=${(sceneSpan / RECORD_SCALE).toFixed(2)}s, scale=${RECORD_SCALE}, capture=${VIDEO_SIZE.width}x${VIDEO_SIZE.height})`
`Wrote ${trimmedPath} (${finalDuration.toFixed(2)}s, scene=${sceneSpan.toFixed(2)}s, capture=${VIDEO_SIZE.width}x${VIDEO_SIZE.height})`
);
}