{"schema":"record/v1","id":"src_01M6V4B166A0HJT16D5WC4N7XR","type":"source","revision":1,"etag":"\"r1.s0\"","title":"Rubber Band Library: audio time-stretching and pitch-shifting library and command-line tool","summary":"Rubber Band is an audio library and utility program that changes the tempo and pitch of a recording independently of one another.","status":"active","body":{"text":"What it supplies: Rubber Band is an audio library and utility program that changes the tempo and pitch of a recording independently of one another.\n\nUseful for: - Stretch or compress a recording and shift its pitch from the command line, for example 50% longer and up a whole tone.\n- Choose the finer R3 engine for complex mixes, vocals and bassy music, at higher CPU cost.\n- Embed time and pitch changes in an application with the RubberBandStretcher and RubberBandLiveShifter classes.\n- Use the bundled LADSPA and LV2 pitch-shifter plugins.\n\nFirst action: - Build the library following COMPILING.md.\n- Run rubberband with a time ratio, a pitch shift in semitones, and input and output wav files.\n- Try -3 for the finer engine, or the -c crispness option with the R2 engine.\n\nPrerequisites and limits: - The command-line tool needs libsndfile to load audio files.\n- Other libraries may be linked depending on build configuration, each under its own licence.\n\n- The R3 engine uses much more CPU than R2.\n- Many options apply only to the R2 engine.\n- The licensing terms restrict closed-source distribution without a commercial licence.\n\nThe README states Rubber Band is under the GPL, version 2 or later. Distributing code that uses it under other terms needs a commercial licence, and Apple App Store distribution is not possible without one.\nAn application using the library must be published under the GPL or a compatible licence unless a commercial licence is obtained; linked libraries and the .NET interface have their own terms.\n\nWritten from the README text only. Statements are as the README gives them; nothing was built or run and no audio was processed, so quality claims are the README's own.\nBased on README text only; COMPILING.md, the COPYING file and the project website were not read. No build or run was made; quality statements are the README's own.\n\nSource inspected: https://raw.githubusercontent.com/breakfastquay/rubberband/e4296ac80b1170018a110bc326fd0d45a0eb27d6/README.md ; 8288 bytes ; sha256 e7a6fc0fd3177e3a166a67e1cb834f6bfdec74c8d8928c71543367558d104ad6 ; 15 exact pinned excerpts in the draft pin map","archived":null,"revision":{"ref":"commit e4296ac80b1170018a110bc326fd0d45a0eb27d6","pinned":false,"source_url":"https://raw.githubusercontent.com/breakfastquay/rubberband/e4296ac80b1170018a110bc326fd0d45a0eb27d6/README.md"},"checked_at":"2026-11-07T10:28:44.294Z","parent_url":null,"usefulness":"- Stretch or compress a recording and shift its pitch from the command line, for example 50% longer and up a whole tone.\n- Choose the finer R3 engine for complex mixes, vocals and bassy music, at higher CPU cost.\n- Embed time and pitch changes in an application with the RubberBandStretcher and RubberBandLiveShifter classes.\n- Use the bundled LADSPA and LV2 pitch-shifter plugins.","source_type":"repository","availability":"available","dependencies":[],"source_owner":"Breakfast Quay (Particular Programs Ltd) (declared repository namespace)","canonical_url":"https://github.com/breakfastquay/rubberband","next_check_at":null,"successor_url":null,"hardware_notes":null,"known_limitations":["- The command-line tool needs libsndfile to load audio files.\n- Other libraries may be linked depending on build configuration, each under its own licence.\n\n- The R3 engine uses much more CPU than R2.\n- Many options apply only to the R2 engine.\n- The licensing terms restrict closed-source distribution without a commercial licence.\n\nThe README states Rubber Band is under the GPL, version 2 or later. Distributing code that uses it under other terms needs a commercial licence, and Apple App Store distribution is not possible without one.\nAn application using the library must be published under the GPL or a compatible licence unless a commercial licence is obtained; linked libraries and the .NET interface have their own terms.\n\nWritten from the README text only. Statements are as the README gives them; nothing was built or run and no audio was processed, so quality claims are the README's own.\nBased on README text only; COMPILING.md, the COPYING file and the project website were not read. No build or run was made; quality statements are the README's own.","Rendered page text of the exact archived capture of the README page, read in full by the author; no media viewed or heard; nothing executed or installed.","Source-documented steps; execution not performed. 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Distributing code that uses it under other terms needs a commercial licence, and Apple App Store distribution is not possible without one.\nAn application using the library must be published under the GPL or a compatible licence unless a commercial licence is obtained; linked libraries and the .NET interface have their own terms.\n\nWritten from the README text only. Statements are as the README gives them; nothing was built or run and no audio was processed, so quality claims are the README's own.\nBased on README text only; COMPILING.md, the COPYING file and the project website were not read. No build or run was made; quality statements are the README's own.\n\nSource inspected: https://raw.githubusercontent.com/breakfastquay/rubberband/e4296ac80b1170018a110bc326fd0d45a0eb27d6/README.md ; 8288 bytes ; sha256 e7a6fc0fd3177e3a166a67e1cb834f6bfdec74c8d8928c71543367558d104ad6 ; 15 exact pinned excerpts in the draft pin map","revision":{"ref":"commit e4296ac80b1170018a110bc326fd0d45a0eb27d6","pinned":false,"source_url":"https://raw.githubusercontent.com/breakfastquay/rubberband/e4296ac80b1170018a110bc326fd0d45a0eb27d6/README.md"},"checked_at":"2026-11-07T10:28:44.294Z","usefulness":"- Stretch or compress a recording and shift its pitch from the command line, for example 50% longer and up a whole tone.\n- Choose the finer R3 engine for complex mixes, vocals and bassy music, at higher CPU cost.\n- Embed time and pitch changes in an application with the RubberBandStretcher and RubberBandLiveShifter classes.\n- Use the bundled LADSPA and LV2 pitch-shifter plugins.","source_type":"repository","availability":"available","source_owner":"Breakfast Quay (Particular Programs Ltd) (declared repository namespace)","canonical_url":"https://github.com/breakfastquay/rubberband","known_limitations":["- The command-line tool needs libsndfile to load audio files.\n- Other libraries may be linked depending on build configuration, each under its own licence.\n\n- The R3 engine uses much more CPU than R2.\n- Many options apply only to the R2 engine.\n- The licensing terms restrict closed-source distribution without a commercial licence.\n\nThe README states Rubber Band is under the GPL, version 2 or later. Distributing code that uses it under other terms needs a commercial licence, and Apple App Store distribution is not possible without one.\nAn application using the library must be published under the GPL or a compatible licence unless a commercial licence is obtained; linked libraries and the .NET interface have their own terms.\n\nWritten from the README text only. Statements are as the README gives them; nothing was built or run and no audio was processed, so quality claims are the README's own.\nBased on README text only; COMPILING.md, the COPYING file and the project website were not read. No build or run was made; quality statements are the README's own.","Rendered page text of the exact archived capture of the README page, read in full by the author; no media viewed or heard; nothing executed or installed.","Source-documented steps; execution not performed. Internal affiliated review is not independent validation."]},"tags":[],"type":"source","title":"Rubber Band Library: audio time-stretching and pitch-shifting library and command-line tool","rights":[{"notes":"Only the team-authored original attributed summary and links are covered. Upstream papers, tutorials, code, models, weights and media retain their separate terms; no source-text/media redistribution right is implied.","hosting":"permitted","component":"documentation","license_id":null,"modification":"permitted","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Rubber Band is an audio library and utility program that changes the tempo and pitch of a recording independently of one another.","evidence":{"review":"unreviewed","execution":"not_run","inspection":"source_inspected"},"language":"en","categories":["T14"],"extensions":{"curation/v1":{"curator":"windows-claude-t2","revision":1,"topic_ids":[],"confidence":"Source-linked original summary checked by its author; not independently reviewed; execution not performed.","limitations":["- The command-line tool needs libsndfile to load audio files.\n- Other libraries may be linked depending on build configuration, each under its own licence.\n\n- The R3 engine uses much more CPU than R2.\n- Many options apply only to the R2 engine.\n- The licensing terms restrict closed-source distribution without a commercial licence.\n\nThe README states Rubber Band is under the GPL, version 2 or later. Distributing code that uses it under other terms needs a commercial licence, and Apple App Store distribution is not possible without one.\nAn application using the library must be published under the GPL or a compatible licence unless a commercial licence is obtained; linked libraries and the .NET interface have their own terms.\n\nWritten from the README text only. Statements are as the README gives them; nothing was built or run and no audio was processed, so quality claims are the README's own.\nBased on README text only; COMPILING.md, the COPYING file and the project website were not read. No build or run was made; quality statements are the README's own.","Rendered page text of the exact archived capture of the README page, read in full by the author; no media viewed or heard; nothing executed or installed.","Source-documented steps; execution not performed. 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Distributing code that uses it under other terms needs a commercial licence, and Apple App Store distribution is not possible without one.\nAn application using the library must be published under the GPL or a compatible licence unless a commercial licence is obtained; linked libraries and the .NET interface have their own terms.\n\nWritten from the README text only. Statements are as the README gives them; nothing was built or run and no audio was processed, so quality claims are the README's own.\nBased on README text only; COMPILING.md, the COPYING file and the project website were not read. No build or run was made; quality statements are the README's own.","Rendered page text of the exact archived capture of the README page, read in full by the author; no media viewed or heard; nothing executed or installed.","Source-documented steps; execution not performed. 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