On iPad Brave, a shared video stopped the moment the browser left the
foreground, even with Brave's "Enable Background Audio" on, while an mp3
kept playing. Brave iOS keeps a web <video> going by re-playing one the OS
paused (brave-core ios/browser/web/media/resources/media_backgrounding.ts),
but it only hooks a <video> present at document start or added as a
MutationObserver addedNode that IS a video. React inserts a player's
<video> inside its freshly mounted wrapper in one go, so Brave never saw it.
lib/browserBackgroundPlay re-inserts a mounted <video> at its own position,
once per element: it becomes an added node, the DOM React manages does not
change, and playback is not interrupted. The watch page, the downloads
library player and the Plex player hand their <video> to it. Measured on the
owner's iPad (Brave) with a prototype of the same idea: the video kept
playing in another app and with the screen locked. The YouTube modal is not
ours to change: its <video> lives in YouTube's cross-origin iframe, and
nothing of ours pauses it on backgrounding.
The prototype's two audio-element variants (a muted video following an
<audio>, and an <audio> taking over on hide) went silent in the background on
the iPad and are removed.
The watch page gets a Repeat toggle, on by default and remembered per
browser (LS.watchRepeat; the page has no account): it sets `loop` on the
<video> or the audio-only <audio>.
A failed Facebook download read "Download failed": yt-dlp words the login wall
(18+ reel, closed group) as "Cannot parse data", which no category matched.
Measured on dev with the owner's cookie before writing a rule — the same text is
the login wall without a cookie and a refused cookie with one.
- errors.diagnose(msg, url, cookie_attached) tries a host-scoped catalog first
(all-of markers, cookie state, link fragment) and falls back to the category.
First entries: facebook.login_wall, facebook.cookie_rejected,
facebook.group_post_video. The module doc is the recipe for the next entry.
- download_jobs.error_detail (0084) + backfill of the stored Facebook parse
failures that were unknown.
- The pipeline's failure branch passes the link and whether the cookie went
with it; resume and redownload clear code and detail (redownload never
cleared error_code).
- A job meeting an already-failed asset got the text but no code, so it read
"Download failed" where the first job said why. It is diagnosed again, with
the cookie state from credentials.is_authed_asset (now shared with the
cookie gate); the redacted network text classifies back to network.
- FE: failCopyKeys gives the row and the failure window one lookup — catalog
copy, else the category. Copy in EN and HU; a contract test pins every
backend entry to both locales.
Deep-review remediation on the frontend, all findings adversarially verified:
- LibraryPlayer picks audio vs video from the canonical media_kind (single source), not a
hardcoded container whitelist, so an uploaded audio file with an uncommon/absent container
renders in <audio> instead of a broken video box (legacy null media_kind keeps the heuristic).
- UploadDialog aborts the in-flight upload when the dialog is closed by X/ESC/backdrop/Back
(not only the footer Cancel); drag highlight uses an enter/leave depth counter to stop the
flicker; the progress bar gets a stable role=progressbar aria-label with the value on aria-valuenow.
- DownloadCenter's Shared tab renders honest loading/error states instead of a blank panel, and
the library/shared row-action gating moves to a single tested helper (lib/downloadActions).
Tests: downloadActions gating matrix, the uploadReq XHR path (abort/401/422-localize/onerror),
and the media_kind-driven audio/video branch.
i18n: downloads.upload.uploadProgress (HU + EN).
Surface the S5a media_kind discriminator in the library UI. A generic
uploaded file (media_kind='file') is download+share only — no player and
no timeline to trim, so Play/Edit/Edit-details are media-only; it shows a
neutral file glyph instead of an (always-empty) thumbnail and no duration
chip (container/size still read). The "Shared with me" tab's file row is
gated the same way. Re-download is now hidden for edit clips and uploads
too (neither has a re-fetchable source — the backend already rejects both
with 409), removing a latent click-to-409 on edit rows.
FE-only: the serializer already emits media_kind (S5a). Adds media_kind to
the DownloadAsset type and "upload" to the job_kind union; DOM tests cover
the file-row presentation (glyph, no img, no duration).
Play a completed library item in-app: a Play button on Library rows (and
Shared rows with download access) opens a modal that streams the local file
into a native <video controls> (or <audio> for audio-only assets).
Rather than the YouTube IFrame PlayerModal or the Plex HLS PlexPlayer — both
bound to their own domain APIs and unable to point at a local file — this
reuses the shared Modal a11y shell (focus-trap, ESC, layer-stack, portal) and
the range-aware /api/downloads/{id}/file endpoint. S4a's universal-codec
guarantee (mp4/H.264/AAC + m4a/mp3) makes native playback always work, so seek,
volume, fullscreen and speed come for free with zero transcode.
peter