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Rate-limit save downloads so they no longer starve playback

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This commit is contained in:
Jonathan Sykes
2026-08-23 23:13:45 +08:00
parent d1ba9d1e9c
commit ea9e372c1e
1 changed files with 7 additions and 2 deletions
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9
server/server.js
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@@ -43,6 +43,11 @@ const PORT = parseInt(process.env.PORT || '3000', 10);
const APP_VERSION = process.env.APP_VERSION || '1.0.0'; const APP_VERSION = process.env.APP_VERSION || '1.0.0';
const YTDLP = process.env.YTDLP_PATH || 'yt-dlp'; const YTDLP = process.env.YTDLP_PATH || 'yt-dlp';
const FFMPEG = process.env.FFMPEG_PATH || 'ffmpeg'; const FFMPEG = process.env.FFMPEG_PATH || 'ffmpeg';
// Cap for server-side SAVE downloads. yt-dlp with -N 4 pinned the homelab's
// whole downlink (~7.6 MB/s measured), and since /api/play fetches its own
// googlevideo slices over the same link, one long save starved every
// concurrent playback (stalled at ~27 s, 11 KB/s). Leave headroom.
const DOWNLOAD_RATE = process.env.DOWNLOAD_RATE || '3M';
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// BUILD_TAG — must be DETERMINISTIC across restarts of identical code. // BUILD_TAG — must be DETERMINISTIC across restarts of identical code.
@@ -677,7 +682,7 @@ async function ytdlpDownloadResponse(videoId, fp, formatArgs) {
`https://www.youtube.com/watch?v=${videoId}`, `https://www.youtube.com/watch?v=${videoId}`,
'--no-warnings', '--no-playlist', '--no-warnings', '--no-playlist',
...formatArgs, ...formatArgs,
'-N', '4', '--limit-rate', DOWNLOAD_RATE,
'-o', tmp, '-o', tmp,
]); ]);
size = statSync(tmp).size; size = statSync(tmp).size;
@@ -730,7 +735,7 @@ async function ytdlpEditedDownloadResponse(videoId, fp, keep) {
'--no-warnings', '--no-playlist', '--no-warnings', '--no-playlist',
'-f', 'bv*[height<=720][ext=mp4]+ba[ext=m4a]/bv*[height<=720]+ba/b[ext=mp4]/b', '-f', 'bv*[height<=720][ext=mp4]+ba[ext=m4a]/bv*[height<=720]+ba/b[ext=mp4]/b',
'--merge-output-format', 'mp4', '--merge-output-format', 'mp4',
'-N', '4', '--limit-rate', DOWNLOAD_RATE,
'-o', srcTmp, '-o', srcTmp,
]); ]);
// 2) Trim + concat the keep segments into the final custom video. // 2) Trim + concat the keep segments into the final custom video.