Otio Convert

OTIO Convert

Context: $ARGUMENTS

Quick start

• Convert between NLE formats: → Step 2 (otio.py convert)
• Print / concat OTIO files: → Step 3 (otio.py cat)
• Timeline stats (track count, duration, clip count): → Step 4 (otio.py stat)
• Filter/edit timeline programmatically: → Step 5 (otio.py tool)
• List installed adapters / plugins: → Step 6 (otio.py plugins)
• View a timeline in Qt viewer: → Step 7 (otio.py view)

When to use

• User has an NLE file (EDL, FCP7 XML, FCPXML, AAF, ALE, XGES) and needs another format.
• User wants to inspect/stat/cat OTIO timelines from the shell.
• User wants to filter or transform a timeline (drop a track, trim a range, rebuild).
• User wants to know what adapters are installed.
• For deeper Python API details or class references, use otio-docs instead.

Step 1 — Install the CLIs

OTIO is a pip package. Install core + every community adapter:

pip install OpenTimelineIO-Plugins   # installs opentimelineio core automatically

This gives you on PATH: otioconvert, otiocat, otiostat, otiotool, otiopluginfo, otioview (Qt; needs PyQt/PySide installed separately — pip install PyOpenTimelineIO[view]).

Verify install:

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py plugins

Step 2 — Convert formats

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py convert \
  --input edit.fcpxml --output edit.otio

Format is auto-detected from the file extension. Shortcut aliases for common source→destination pairs:

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py convert \
  --input cut.edl --output cut.otio --preset edl-to-otio

The wrapper prints the real otioconvert command to stderr before running it; --dry-run echoes without executing.

Step 3 — Cat / print timelines

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py cat --input edit.otio
uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py cat --input a.otio --input b.otio --output combined.otio

Pass-through for otiocat: multiple --input = concatenate in order.

Step 4 — Stats

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py stat --input edit.otio

Prints track count, clip count, total duration, start/end time ranges — matches otiostat output.

Step 5 — Transform with otiotool

otiotool is the surgical-edit multi-tool. The wrapper passes args through:

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py tool \
  --input edit.otio --output flat.otio \
  -- --flatten video --remove-transitions

Everything after -- is forwarded verbatim to otiotool. Common flags:

Consult otiotool --help for the full list.

Step 6 — Plugin info

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py plugins

Enumerates: adapters, media linkers, schemadefs, hooks. Use to confirm an adapter (e.g. aaf_adapter, fcpx_xml) is installed before attempting conversion.

Step 7 — View

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py view --input edit.otio

Launches otioview Qt GUI (macOS/Windows/Linux with Qt). Needs PyOpenTimelineIO[view] installed.

Gotchas

• OpenTimelineIO-Plugins is the right install for NLE round-trips. Just pip install opentimelineio gives you ONLY native otio_json / otiod / otioz adapters — no EDL, no FCP7 XML, no AAF.
• AAF adapter needs pyaaf2. On some systems pip install pyaaf2 has native-build hurdles. Try conda-forge: conda install -c conda-forge pyaaf2.
• Extension → adapter mapping is strict. .edl → cmx_3600, .xml → fcp_xml (NOT FCPXML), .fcpxml → fcpx_xml, .aaf → aaf_adapter, .otio/.otiod/.otioz → native. Passing a FCPX .fcpxml file with .xml extension will misroute to FCP7 adapter.
• Round-trips lose data. EDL has no effects, no audio metadata, no generators. FCP7↔FCPX drops clip IDs. AAF↔OTIO drops some effect parameter keyframes. .otio is the only lossless canonical format — hop through it.
• otioconvert --input-adapter and --output-adapter override extension detection when the filename doesn't match (e.g. EDL with .txt extension): otioconvert -i cut.txt --input-adapter cmx_3600 -o cut.otio.
• otiotool is NOT a round-trip tool; it's an in-place transform. It reads OTIO, applies transforms, writes OTIO. To transform an EDL → trimmed EDL, convert EDL→OTIO, run otiotool, convert OTIO→EDL.
• Track kind is case-sensitive: "Video" / "Audio". otiotool --flatten video is lowercase arg, but the internal track.kind string is "Video". Don't mix up.
• otioview needs Qt. Headless boxes (CI, SSH) can't run it. Use otiostat + otiocat for text-only inspection.
• RationalTime is rate-aware. otiostat prints durations as value@rate pairs. A 24fps timeline of 10 seconds shows 240@24, NOT 10.0. Don't interpret as seconds — divide by rate.
• The script is stdlib-only. It wraps the pip-installed OTIO CLIs — it doesn't reimplement OTIO logic.

Examples

Example 1 — FCPXML from Final Cut Pro → Premiere-compatible FCP7 XML

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py convert \
  --input cut.fcpxml --output cut.xml --preset fcpx-to-fcp7

Premiere imports both, but FCP7 XML is the stable round-trip.

Example 2 — EDL → OTIO → quick stats

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py convert --input cut.edl --output cut.otio
uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py stat --input cut.otio

Example 3 — Flatten all video tracks into one

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py convert --input edit.fcpxml --output edit.otio
uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py tool \
  --input edit.otio --output flat.otio -- --flatten video

Example 4 — Concat two cuts into one timeline

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py cat \
  --input scene1.otio --input scene2.otio --output reel.otio

Example 5 — Check AAF adapter is installed

uv run ${CLAUDE_SKILL_DIR}/scripts/otio.py plugins | grep aaf

Troubleshooting

No adapter available for file 'foo.aaf'

Cause: aaf_adapter not installed (or pyaaf2 broken). Solution: pip install OpenTimelineIO-Plugins (gets everything). If AAF still fails: pip install pyaaf2 first.

otioview: command not found

Cause: Qt/viewer extras not installed. Solution: pip install 'PyOpenTimelineIO[view]' or install PyQt5/PySide2 manually.

EDL round-trip loses frame rates

Cause: EDL headers don't carry rate; cmx_3600 adapter defaults to 24fps. Solution: Pass --rate 29.97 (or whatever) to otioconvert via otio.py convert ... -- --rate 29.97, or include a leader with rate in the EDL header.

Extension mismatch — .xml file treated as FCP7 but is actually FCPX

Solution: Pass explicit adapter: otioconvert -i weird.xml --input-adapter fcpx_xml -o out.otio. Or rename file to .fcpxml first.

Wrapper prints otioconvert: command not found

Solution: Install OTIO: pip install OpenTimelineIO-Plugins. Make sure the venv is active (which otioconvert).

Reference docs

• Full adapter matrix (round-trip fidelity) + install notes → see the otio-docs skill's references/adapters.md.
• otiotool transform catalog → references/otiotool.md in this skill.