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build: codec presets for smaller core builds - #65
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📝 SummarySummary by CodeRabbit
WalkthroughThe build now supports ChangesCore preset builds
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant GitHub Actions
participant Makefile
participant Dockerfile
participant FFmpeg
participant preset-check.mjs
GitHub Actions->>Makefile: Run preset build target
Makefile->>Dockerfile: Pass PRESET
Dockerfile->>FFmpeg: Source preset flags and build
GitHub Actions->>preset-check.mjs: Check built core against preset
preset-check.mjs->>GitHub Actions: Report sizes and check results
Merge Risk: 🔵 Low · up to The preset builds appear mergeable with awareness that unusual codec-list logging could cause a false CI failure; the actual logger framing remains unverified. Security Architecture ReviewSecurity architecture risk: ⚪ Minimal · up to Published builds retain their existing configuration and permissions. Smaller presets are opt-in, and their CI outputs do not enter the publication path. No material security risk was identified in the reviewed change. Retained concerns Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 5 files. (6 skipped: 6 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
✨ Simplify code
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Adds codec presets (full, web, decode) that select FFmpeg configure flags and link libraries for core builds, with a CI matrix that builds and checks the smaller presets. The Dockerfile now reads these from a preset env file instead of listing them inline. I could not see the preset env files (build/presets/*.env), so I could not verify their contents, including that full is unchanged.
Not approved: the reviewer could not see enough of the change to decide.
review-bot, model qwen/qwen3.8-27b:free, verdict comment
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Adds codec presets (full, web, decode) for building smaller ffmpeg.wasm cores. The Dockerfile now reads configure flags and link libraries from a preset .env file instead of hardcoding them, and CI builds the web and decode presets for both st and mt cores with a new check script that verifies codecs and runs a short decode/encode. The full preset is the default; the .env files were not shown in the diff, so their correctness rests on the passing CI runs.
review-bot, model qwen/qwen3.8-27b:free, verdict approve
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This PR introduces codec presets (full, web, decode) for building smaller ffmpeg.wasm cores. Presets are defined in build/presets/*.env and selected via PRESET= at make time. The Dockerfile now sources the preset file to get FFMPEG_FLAGS, FFMPEG_LIBS, and optional FFMPEG_LINK_FLAGS. CI adds a build-preset matrix job that builds web and decode for both single-thread and multi-thread cores, then runs scripts/preset-check.mjs to verify size, component presence/absence, and basic encode/decode functionality. The published packages continue to use the full preset.
review-bot, model nvidia/nemotron-3-ultra-550b-a55b:free, verdict approve
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @scripts/preset-check.mjs:
- Around line 59-65: Update names to split each logger message into individual
lines before applying the encoder/decoder regex, then collect the matches as
before. Preserve the existing filtering of empty matches and the "=" legend
entry.
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📒 Files selected for processing (11)
.github/workflows/CI.ymlAGENTS.mdDockerfileMakefileapps/website/docs/contribution/core.mdapps/website/docs/presets.mdapps/website/sidebars.jsbuild/presets/decode.envbuild/presets/full.envbuild/presets/web.envscripts/preset-check.mjs
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⏰ Context from checks skipped due to timeout. (7)
- GitHub Check: build
- GitHub Check: build-preset (web, st)
- GitHub Check: build-preset (decode, st)
- GitHub Check: build-preset (web, mt)
- GitHub Check: build-preset (decode, mt)
- GitHub Check: build-core
- GitHub Check: build-core-mt
🧰 Additional context used
🧠 Learnings (1)
📓 Common learnings
Learnt from: CR
Repo: Project516/ffmpeg.wasm
Timestamp: 2026-10-05T15:04:29.580Z
Learning: Source excerpt:
# ffmpeg.wasm
## Review
PRs target `master` and squash merge. The CI jobs `js`, `build-core`,
`build-core-mt`, and `tests` are required checks.
Learnt from: CR
Repo: Project516/ffmpeg.wasm
Timestamp: 2026-10-05T15:04:29.580Z
Learning: Source excerpt:
# ffmpeg.wasm
## Review
PRs target `master` and squash merge. The CI jobs `js`, `build-core`,
`build-core-mt`, and `tests` are required checks.
Learnt from: CR
Repo: Project516/ffmpeg.wasm
Timestamp: 2026-10-05T15:04:29.580Z
Learning: Source excerpt:
# ffmpeg.wasm
## Review
Review happens before merge, on the head commit:
- CodeRabbit is on the free tier and is usually rate limited. When it does
request changes, that also blocks: resolve its threads once fixed and ask it
to approve.
Learnt from: CR
Repo: Project516/ffmpeg.wasm
Timestamp: 2026-10-05T15:04:29.580Z
Learning: Source excerpt:
# ffmpeg.wasm
## Review
Review happens before merge, on the head commit:
- project516-review-bot reviews every push. Reply on its inline threads with
evidence; it concedes or pushes back in the thread, and it lifts its own
CHANGES_REQUESTED once every thread is settled. Its CHANGES_REQUESTED blocks
merging.
Learnt from: CR
Repo: Project516/ffmpeg.wasm
Timestamp: 2026-10-05T15:04:29.580Z
Learning: Source excerpt:
# ffmpeg.wasm
## Review
Review happens before merge, on the head commit:
- Do not arm auto-merge; merge once CI is green and the review is settled.
Learnt from: CR
Repo: Project516/ffmpeg.wasm
Timestamp: 2026-10-05T15:04:29.580Z
Learning: Source excerpt:
# ffmpeg.wasm
## Review
Review happens before merge, on the head commit:
- If review-bot fails to review a head (its free models time out or return
nothing) or keeps making claims that are verifiably false, a Sonnet subagent
reviews the PR instead, and its findings are fixed or answered on the PR.
🪛 Checkov (3.3.17)
Dockerfile
[low] 1-239: Ensure that HEALTHCHECK instructions have been added to container images
(CKV_DOCKER_2)
[low] 1-239: Ensure that a user for the container has been created
(CKV_DOCKER_3)
🪛 Hadolint (2.15.1)
Dockerfile
[info] 215-215: Double quote to prevent globbing and word splitting.
(SC2086)
[warning] 221-221: COPY to a relative destination without WORKDIR set.
(DL3045)
[info] 227-227: Double quote to prevent globbing and word splitting.
(SC2086)
[info] 232-232: Double quote to prevent globbing and word splitting.
(SC2086)
🪛 zizmor (1.30.1)
.github/workflows/CI.yml
[error] 79-79: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)
(unpinned-uses)
[warning] 127-128: credential persistence through GitHub Actions artifacts (artipacked): does not set persist-credentials: false
(artipacked)
[warning] 134-134: code injection via template expansion (template-injection): may expand into attacker-controllable code
(template-injection)
[warning] 141-141: code injection via template expansion (template-injection): may expand into attacker-controllable code
(template-injection)
[error] 103-103: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)
(unpinned-uses)
[error] 110-110: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)
(unpinned-uses)
[error] 128-128: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)
(unpinned-uses)
[error] 130-130: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)
(unpinned-uses)
[error] 132-132: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)
(unpinned-uses)
[error] 136-136: unpinned action reference (unpinned-uses): action is not pinned to a hash (required by blanket policy)
(unpinned-uses)
[info] 118-118: workflow or action definition without a name (anonymous-definition): this job
(anonymous-definition)
🔇 Additional comments (13)
Dockerfile (1)
215-215: Unquoted$FFMPEG_FLAGSand${FFMPEG_LIBS}rely on word splitting.The word splitting is intentional here, because the preset values are multi-line lists. The values contain no glob characters, so the hadolint SC2086 hints are false positives. Keep the code as it is.
Check one item:
build/ffmpeg.shuses$@unquoted, so the multi-lineFFMPEG_FLAGSstring is split as intended. Keep the preset files free of*and?characters.Also applies to: 227-228, 232-233
build/presets/full.env (1)
1-21: LGTM!build/presets/web.env (1)
1-25: LGTM!Makefile (1)
3-4: LGTM!Also applies to: 25-25, 31-31
scripts/preset-check.mjs (1)
30-33: Verify that thedecodeexpectationabsentlist matches the preset.
decode.envdoes not enablelibx264,libx265,libmp3lame,libvpx-vp9orlibopus. The list is consistent. Note thatdecodealso lackslibvpx, so the nativevp9decoder carries VP9 decoding. Theproresdecoder is not in thewebpreset, andweblists it underabsent. This matches--disable-everything..github/workflows/CI.yml (3)
134-134: Cache scope sharing can poisonfullcache layers.The
build-presetjob reads fromscope=${{ matrix.core }}, which is the same scope asbuild-core(scope=st) andbuild-core-mt(scope=mt). It does not write to the cache, so thefulljobs are not poisoned. The library layers stay shared and cached, which is the intended benefit. ThePRESETARG is declared late, so only layers after it are invalidated. No change is needed.
82-84: A failingnodecommand can be hidden by theteepipe.
shell: bashin GitHub Actions runs with-e -o pipefailwhenshell: bashis set explicitly. The pipeline then returns the exit code ofnode. The failure propagates. This is correct.Also applies to: 106-108, 139-141
134-134: 🔒 Security & Privacy | 🛡️ Detected with Advanced TierThe fixed matrix values do not create a shell-injection risk.
build/presets/decode.env (1)
11-14: 🎯 Functional CorrectnessNo actionable failure is shown.
CI is configured to build the
decodepreset for both core types and run its checks. The inspected workflow does not establish the result of a particular CI run, but the comment identifies no failure or violated project requirement.AGENTS.md (1)
63-65: LGTM!Also applies to: 81-81, 89-90
apps/website/docs/contribution/core.md (1)
36-60: LGTM!Also applies to: 70-70, 72-72
apps/website/docs/presets.md (1)
1-54: LGTM!apps/website/sidebars.js (1)
32-32: LGTM!
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Replaces the inline FFmpeg configure flags and link libraries in the Dockerfile with preset files under build/presets/, adds a PRESET variable to the Makefile, and introduces a build-preset CI matrix job plus scripts/preset-check.mjs to verify each built core contains the codecs its preset promises. The full preset is the default and is intended to produce the same build as before.
review-bot, model qwen/qwen3.8-27b:free, verdict approve
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✅ Action performedComments resolved and changes approved. |
What
Adds codec presets for the core build.
PRESETselectsbuild/presets/<name>.env, which sets the FFmpeg configure flags (FFMPEG_FLAGS), the libraries the core links (FFMPEG_LIBS) and optional extra link flags.make prd PRESET=webbuilds a smaller single-thread core, andmake prd-mt PRESET=webthe multi-thread one. The Dockerfile now reads these from the preset file instead of listing them inline.fullis the default and has exactly the flags and libraries the Dockerfile had, so the published packages are unchanged.fullwebdecodeSizes are from CI run https://github.com/Project516/ffmpeg.wasm/actions/runs/37320991036, gzip level 9, FFmpeg n9.0.2. They are recorded in
apps/website/docs/presets.md, which also documents the preset list and how to build or write one.contribution/core.mdpoints to it instead of the old hand-edit-the-Dockerfile steps.CI builds
decodeandwebfor both cores in a newbuild-presetmatrix.scripts/preset-check.mjsprints each core's size as a job summary row and checks that it has the codecs its preset lists, lacks the ones it leaves out, and can run a short decode and encode. The same script runs on thefullbuilds inbuild-coreandbuild-core-mt.No new packages. Part of #49. Closes #51.
Noticed, not fixed
wasm-opt -O3in emsdk 6.0.10 aborts on thedecodemodule (constraint.cppassertion inapproximateOr) on both cores, sodecodelinks at-O2throughFFMPEG_LINK_FLAGS. I did not find which function triggers it.fullandweblink at-O3.webbuild still compiles x265. Skipping stages per preset needs conditionalCOPY --fromlines. The layers are cached after the first build.Testing
CI on this PR: all four preset builds pass the check script, and
build-core,build-core-mt,tests,node-testsand the FATE jobs pass on thefullbuild.