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Retry playback negotiation when a DirectStream URL is missing - #596
A VOD source can be approved for direct play by the server while the platform's local checks select DirectStream. If the PlaybackInfo response supplies neither DirectStreamUrl nor TranscodingUrl, Moonfin currently throws No playback URL available without renegotiating. This occurred with an AV1/Dolby Vision source on a Samsung S95B.
Extend the existing forced-transcode retry to cover this missing-URL case. When transcoding is not explicitly disabled, ask for a video encode with the selected media source preserved, and omit an AV1-only transcoding profile when another video profile is available. A valid existing DirectStreamUrl or TranscodingUrl continues to be used without this retry.
Related Issues
Related background: #533 and #484 discuss AV1 encode-profile/container constraints. This PR addresses a separate missing-URL fallback; it does not claim to resolve those reports or all AV1 playback problems.
Type of Change
Bug fix
Changes Made
Retry negotiation when local DirectStream selection has neither supported stream URL, respecting an explicit enableTranscoding: false for both missing-URL retry paths.
For that case, disable direct play, direct stream and video stream copy; exclude the AV1-only encode profile only if an alternative video profile remains.
Retry with the source Moonfin actually selected. This retains an explicit selection when present and avoids resending a stale requested ID absent from the server response. Keep resume position, audio/subtitle indices and bitrate limit on the retry.
Add nine regression cases covering the retry, both existing URL forms, automatic version selection, stale requested IDs, explicit transcoding opt-out for DirectStream/Transcode, an AV1-only profile and a failed retry.
Platform
Tizen (Samsung)
webOS (LG)
Vega (Fire TV)
Xbox
All / Shared code
The changed module is shared; physical-device evidence is limited to Tizen.
Testing
Tested on emulator
Tested on physical device
Manual testing completed
The new primary regression fails against unmodified current main with No playback URL available.
CI_SKIP_TIZEN_CLI=1 npm run build:tizen: Tizen Regular production package built successfully (unsigned WGT). Local minifier concurrency was limited for workstation memory; no build configuration changes are included.
Test Steps
On a Samsung QN55S95BAFXZA (S95B), Tizen 6.5, firmware 1720.7, connected to Jellyfin 12.4.0, select an MKV source with AV1 10-bit video at 1920×804, reported VideoRangeType DOVIInvalid (DV profile 10), with EAC3 audio.
Confirm the unpatched 3.0.0 app fails with No playback URL available.
With the same playback.js patch, start the same media-source ID. Jellyfin reports a Quick Sync HEVC transcode with direct EAC3 audio; client positions advance from 6 to 26.53 to 69.53 seconds. FFmpeg reports roughly 18× real-time encoding with no errors observed.
Stop playback and restore the test item's original unwatched state.
Device evidence comes from the original fallback in a locally signed build based on tag 3.0.0, before the review follow-up. The explicit opt-out and stale-source-ID corrections have automated regression coverage and a production Tizen build; this revised branch has not been deployed or retested on a TV. Playback telemetry and server output were verified. The compositor capture omits the video plane, so physical picture quality, audible sync, HDR handling and 4K capacity were not verified. Other TV platforms were not device-tested.
AV1 capability context
Samsung lists the S95B family (QBQS95, group 22TV_PREMIUM3) with AV1 decoding up to 3840×2160, 120 fps and 40 Mbps in its 2022 video specifications, table 3. The test source is within those size/rate limits. The observed rejection is Moonfin's local HDR decision for DOVIInvalid, not an observed AVPlay decoder failure. Jellyfin 12.4 labels the source's DV profile 10 / compatibility ID 6 invalid; whether that file can safely play as HDR10 has not been established.
The test server has an Intel Arc A380 whose driver exposes AV1 decode and encode entry points, with Jellyfin AV1 encoding enabled. The AV1-only profile exclusion is a conservative compatible-output fallback, not a claim that this server lacks an AV1 encoder. A completed November 2 capability audit progressed natively with AV1 MP4/MKV, 4K24/60/120, higher bitrate and HDR10. It also isolated a separate MP4-as-mov naming mismatch, fixed independently in the locally tested 3.0.2 build. The real excerpt without DV metadata progressed directly, while the DOVIInvalid variant used this HEVC fallback. Physical color/HDR correctness remains unverified. That separate alias change is excluded from this PR; the results do not broaden this missing-URL fix into general Dolby Vision support.
Tradeoff
This is a conservative fallback: when transcoding is allowed, a missing stream URL causes a video encode. With transcoding explicitly disabled, the missing-URL error is retained without a forced-transcode retry. That can use more server resources and change HDR handling, even if a different remux-only strategy might be possible. Working stream URLs and ordinary direct play are unchanged. If the server still supplies no URL, playback fails after one retry.
AI assistance
Prepared with OpenAI Codex. The playback path and tests were reviewed. The original fallback was exercised on the physical Samsung TV as described above; the two review-follow-up corrections were verified with automated regression tests and a production build. Test results and limitations are stated explicitly.
Checklist
Code builds successfully
Code follows project style and conventions
No unnecessary commented-out code
No new warnings introduced (not asserted: build succeeds with browser-data freshness notices, Babel corejs configuration and Node DEP0190 toolchain warnings; these configuration files are unchanged)
Compatibility scope review
This shared negotiation fix has no Samsung model-name or Tizen-version gate. It is bounded by the missing-URL condition, keeps working remux URLs and preserves the selected source. No broader codec claim is introduced. The later combined integration passed 4,197 tests /357 suites; physical evidence remains the earlier S95B run. No new TV access occurred during the scope review.
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Summary
Summary by CodeRabbit
Bug Fixes
Playback can retry with transcoding when the selected source lacks a usable playback URL and transcoding is enabled.
Retries preserve the selected media source, playback position, bitrate, and applicable subtitle choices. Existing playback URLs continue to be used without an unnecessary retry.
When available, playback uses a profile without AV1 for the retry if video transcoding is supported.
For applicable transcoded playback, PGS default subtitles remain available for client rendering.
Playback reports failure when a retry returns no playable source.
Playback now retries negotiation with transcoding when the selected method has no usable URL. It also changes how eligible non-Plex playback handles a default PGS subtitle during transcoding. Tests cover retry options, subtitle selection, source selection, and retry failure.
For eligible non-Plex transcodes, negotiation omits a server-selected default PGS subtitle, then restores its index in the returned source. Tests cover subtitle types, server types, and selection modes.
Missing-URL retry and validation packages/app/src/services/playback.js, packages/app/src/services/playback.capabilities.test.js
When playback lacks a usable URL and transcoding is enabled, the fallback retries with DirectPlay and DirectStream disabled. For a missing-remux URL, it disables video stream copy and uses a non-AV1 profile when another video-transcoding profile is available. Tests cover retry conditions, source selection, and retry failures.
sequenceDiagram
participant Playback
participant PlaybackInfoServer
Playback->>PlaybackInfoServer: Request playback information
PlaybackInfoServer-->>Playback: Return source without a usable URL
Playback->>PlaybackInfoServer: Retry with transcoding enabled
PlaybackInfoServer-->>Playback: Return source with a stream URL
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Possibly related PRs
Moonfin-Client/Smart-TV#565: Changes the playback negotiation flow in the same service, including server-specific URL and subtitle handling.
Moonfin-Client/Smart-TV#597: Changes getPlayMethod, which affects the local playback method used by the retry logic.
Moonfin-Client/Smart-TV#600: Changes getPlayMethod results that can affect which playback negotiation path reaches the retry logic.
Suggested reviewers:radicalmuffinman
Merge Risk: Low · previous review 1839e
When a video has a DVD/DVB default subtitle (or a PGS default with PGS rendering disabled) and the user prefers subtitles Off or a different track, the server-burned default can still appear. The missing-URL retry itself and the other reviewed paths look sound. The edge case is narrow and can be handled before or after merge.
Pre-merge checks: 4
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The title clearly and concisely describes the main change: retrying playback negotiation when a DirectStream URL is missing.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @packages/app/src/services/playback.js:
- Line 807: Update the avoidDefaultSubtitleBurnIn condition so the no-burn path
applies only to a default PGS subtitle when enablePgsRendering is enabled. Do
not include other burn-in formats, such as DVD or DVB bitmap, so the server
continues handling defaults the client cannot render.
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The retry is a reasonable safety net, but I'd rather fix why we end up there, and the subtitle change needs to come out.
The missing-URL case only happens one way. getPlayMethod checks hdrOk before DirectPlay but not before DirectStream (video.js L307). When the server approves a source for direct play and our HDR check rejects it, we pick DirectStream, and there's no URL because the server never made one. Remuxing can't fix an HDR range problem anyway. Requiring hdrOk in the DirectStream branch sends it to Transcode, where the existing missing-TranscodingUrl retry already renegotiates.
The AV1 codec profile has no VideoRangeType condition (deviceProfile.js L729-L748). The HEVC profile lists DOVIInvalid (L619), while getPlayMethod treats it as bare Dolby Vision (video.js L268), so HEVC DOVIInvalid hits the same failure. Lining the profiles up with the local HDR rules fixes both codecs, and the server then encodes the video instead of approving it.
The burn-in rewrite isn't related to the missing URL and isn't in the description. Main deliberately never burns in a default bitmap subtitle the user didn't pick (playback.js L814-L819). This PR burns DVD and VobSub defaults in again, which turns a remux into a full video encode. If you think that should change, open it as its own PR with the reasoning and take it out of this PR.
The description says the revised branch hasn't been on a TV. Fix the PR then retest with the AV1 file and with an ordinary file that has a bitmap default subtitle.
I'd take a small PR that does 1 and 2 over this one.
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Summary
A VOD source can be approved for direct play by the server while the platform's local checks select DirectStream. If the PlaybackInfo response supplies neither DirectStreamUrl nor TranscodingUrl, Moonfin currently throws
No playback URL availablewithout renegotiating. This occurred with an AV1/Dolby Vision source on a Samsung S95B.Extend the existing forced-transcode retry to cover this missing-URL case. When transcoding is not explicitly disabled, ask for a video encode with the selected media source preserved, and omit an AV1-only transcoding profile when another video profile is available. A valid existing DirectStreamUrl or TranscodingUrl continues to be used without this retry.
Related Issues
Related background: #533 and #484 discuss AV1 encode-profile/container constraints. This PR addresses a separate missing-URL fallback; it does not claim to resolve those reports or all AV1 playback problems.
Type of Change
Changes Made
enableTranscoding: falsefor both missing-URL retry paths.Platform
The changed module is shared; physical-device evidence is limited to Tizen.
Testing
Tested on emulator
Tested on physical device
Manual testing completed
The new primary regression fails against unmodified current main with
No playback URL available.CI=true npm test --workspace @moonfin/app -- --runInBand --watch=false: 347 suites, 4,071 tests passed.App ESLint and the legacy CSS check passed.
CI_SKIP_TIZEN_CLI=1 npm run build:tizen: Tizen Regular production package built successfully (unsigned WGT). Local minifier concurrency was limited for workstation memory; no build configuration changes are included.Test Steps
DOVIInvalid(DV profile 10), with EAC3 audio.No playback URL available.Device evidence comes from the original fallback in a locally signed build based on tag 3.0.0, before the review follow-up. The explicit opt-out and stale-source-ID corrections have automated regression coverage and a production Tizen build; this revised branch has not been deployed or retested on a TV. Playback telemetry and server output were verified. The compositor capture omits the video plane, so physical picture quality, audible sync, HDR handling and 4K capacity were not verified. Other TV platforms were not device-tested.
AV1 capability context
Samsung lists the S95B family (
QBQS95, group22TV_PREMIUM3) with AV1 decoding up to 3840×2160, 120 fps and 40 Mbps in its 2022 video specifications, table 3. The test source is within those size/rate limits. The observed rejection is Moonfin's local HDR decision forDOVIInvalid, not an observed AVPlay decoder failure. Jellyfin 12.4 labels the source's DV profile 10 / compatibility ID 6 invalid; whether that file can safely play as HDR10 has not been established.The test server has an Intel Arc A380 whose driver exposes AV1 decode and encode entry points, with Jellyfin AV1 encoding enabled. The AV1-only profile exclusion is a conservative compatible-output fallback, not a claim that this server lacks an AV1 encoder. A completed November 2 capability audit progressed natively with AV1 MP4/MKV, 4K24/60/120, higher bitrate and HDR10. It also isolated a separate MP4-as-mov naming mismatch, fixed independently in the locally tested 3.0.2 build. The real excerpt without DV metadata progressed directly, while the DOVIInvalid variant used this HEVC fallback. Physical color/HDR correctness remains unverified. That separate alias change is excluded from this PR; the results do not broaden this missing-URL fix into general Dolby Vision support.
Tradeoff
This is a conservative fallback: when transcoding is allowed, a missing stream URL causes a video encode. With transcoding explicitly disabled, the missing-URL error is retained without a forced-transcode retry. That can use more server resources and change HDR handling, even if a different remux-only strategy might be possible. Working stream URLs and ordinary direct play are unchanged. If the server still supplies no URL, playback fails after one retry.
AI assistance
Prepared with OpenAI Codex. The playback path and tests were reviewed. The original fallback was exercised on the physical Samsung TV as described above; the two review-follow-up corrections were verified with automated regression tests and a production build. Test results and limitations are stated explicitly.
Checklist
Compatibility scope review
This shared negotiation fix has no Samsung model-name or Tizen-version gate. It is bounded by the missing-URL condition, keeps working remux URLs and preserves the selected source. No broader codec claim is introduced. The later combined integration passed 4,197 tests /357 suites; physical evidence remains the earlier S95B run. No new TV access occurred during the scope review.