mirror of
https://github.com/heygen-com/hyperframes.git
synced 2026-09-05 00:56:23 +00:00
Miguel Ángel
8a3227f548
* fix(engine): write the audio mix filter graph to a file, not the command line mixAudioTracks built the ffmpeg -filter_complex argument as one inline string scaling linearly with track count. Reported in the wild at 146 timed audio clips: the resulting command line exceeded the OS length limit and spawn failed with ENAMETOOLONG, dropping audio entirely until the user manually consolidated clips to reduce the count. FFmpeg supports -filter_complex_script specifically for this - the same filter graph read from a file instead of inlined as an argument. The -i pairs for each track still scale with count but stay short and fixed-size each, so the one component that actually grew unbounded (the filter string) no longer sits on the command line at all. The temp file is cleaned up immediately after ffmpeg exits, matching the existing sibling temp-file convention in audioVolumeEnvelope.ts. Verified end-to-end against a real ffmpeg binary (not just mocked): a two-track mix produced correct output audio with no leftover temp files. * fix(engine): create audio filter scripts safely