fix: produce valid audio chunks when transcribing files >25MB - #51
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The old chunking logic split raw file bytes at arbitrary boundaries, producing invalid audio files that Whisper rejects. Web used blob.slice() on WebM containers; native split base64-encoded M4A at random offsets. Fix: Web now decodes via AudioContext to PCM then encodes valid WAV chunks. Native parses the M4A (MP4) container to find sample boundaries and builds valid M4A files for each chunk with proper atoms. https://claude.ai/code/session_01AALsZMcA3oGi5w3xEcR71C
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The old chunking logic split raw file bytes at arbitrary boundaries,
producing invalid audio files that Whisper rejects. Web used blob.slice()
on WebM containers; native split base64-encoded M4A at random offsets.
Fix: Web now decodes via AudioContext to PCM then encodes valid WAV
chunks. Native parses the M4A (MP4) container to find sample boundaries
and builds valid M4A files for each chunk with proper atoms.
https://claude.ai/code/session_01AALsZMcA3oGi5w3xEcR71C