How-to guides¶

Goal-oriented recipes for specific problems.

• Build from source: the clean-room Docker build (LGPL or GPL, the wasm module or the native driver).
• Choose & verify a variant: pick the right artifact and check its checksum.

From Go (via afmpeg):

• Consume a released module: WithModuleURL(<release asset>, WithSHA256(…)).
• Run a transcode entirely in memory: build a Command and RunJob; see the job-spec vocabulary for the process/probe shapes.

When a job fails¶

• Read the stderr line first: it names the cause. Errors & exit codes maps every message to what to change.
• Check the capability is in your profile: most "unknown encoder" and "bad filtergraph" failures are a lean module being asked for something in intermediate. See codecs, filters and containers.
• Check it is supported at all: limits lists what no build does.