Drive ffmpeg through the media_run tool as an argv array - remux instead of re-encode, map streams explicitly, trim at keyframes, scale and crop, extract audio and frames, and build GIFs, contact sheets and concatenations. Covers the flags this pack injects, reading a failure from its exit code and last log lines, and the version-dependent spellings to hedge.
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The SuperCollider language itself - function blocks and argument syntax, UGen rate methods (.ar/.kr/.ir), multi-channel expansion, var scoping, ~environment variables, the class library's shape, and the error messages that mean a specific mistake. Written for an agent that knows audio DSP but not this language.
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Build a SuperCollider piece up while it plays - start a sound, change it in place, layer it, and stop it cleanly - using the dsh-supercollider tools (sc_exec, sc_nodes, sc_play, sc_stop-via-sc_exec) and the idioms that make a session survive (Ndef, ProxySpace, Pbind, ~variables, s.freeAll).
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Work with SuperCollider projects as files - the shape of a .scd piece, how to read and write one with sc_project, how to send the file that is on disk into the live session with sc_load, what state belongs in the session and what belongs in the file, and how to package a piece the SuperCollider way (a folder with its .scd, its SynthDefs, and a Quark-style layout) instead of inventing a format.
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Find the answer in the SuperCollider documentation that ships with the install instead of guessing - what sc_help's search, answer, class and index actions return, what the .schelp tree looks like (over a thousand files: Classes, Guides, Reference, Overviews), how to read a class page for its argument names, and where the server's OSC commands are written down.
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Write, compile, load, debug and re-use SuperCollider SynthDefs with sc_synthdef - the unit of sound design in SuperCollider. Covers Out and ReplaceOut, argument naming, envelopes and doneAction, why a def must be loaded on a specific server before /s_new works, and how to read the compiler's error rather than guessing.
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Author TikZ/LaTeX diagrams that compile: use the host's prepared preamble, the right libraries, layout and plot recipes, and read the compiler's line-accurate errors to converge in a couple of writes. A bundled reference covers complex, large pictures.
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Read and understand PDF documents with the pdf_* tools - inspect a document before reading it, extract text in reading order or as reconstructed layout, search a document without reading all of it, recognize scanned pages that have no text layer, and render pages as pictures. Covers scanned documents, chat attachments, page-range and character caps, and the read-only and untrusted-content rules.
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Render a web page on the host and measure it - screenshots, computed styles, element boxes and post-script text - when a page only exists after its scripts run or when the question is about layout. Covers choosing between web_fetch and a render, reading a design's real measurements, comparing viewports, and the egress policy that decides what may be reached.
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