Preserve multichannel audio layout in previews - #15828
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📝 WalkthroughWalkthroughThe audio save path now selects channel-count layouts for Opus and FLAC streams. MP3 encoding uses explicit mono or stereo layouts. Audio frames use contiguous channel-major floating-point data in planar format. Parametrized tests validate FLAC, Opus, and MP3 output with multiple channel counts, decoded durations, and channel layouts. Merge Risk: ⚪ Minimal · up to This localized change preserves multichannel audio layouts in previews while maintaining existing mono/stereo MP3 behavior. No actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@tests-unit/comfy_api_test/audio_save_test.py`:
- Around line 9-35: Add parametrized tests alongside
test_flac_preserves_audio_channels_and_duration for format="opus" and
format="mp3", validating decoded duration and channel counts; require Opus to
preserve six channels, and require MP3 to decode as mono for one-channel input
and stereo for multichannel input.
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Fixes #15816
Multi-channel waveforms were flattened and encoded with a stereo frame layout. A 5.1 input therefore produced three times as many stereo samples, making previews three times longer and play at one-third speed.
This preserves the real channel layout with planar PyAV frames. FLAC and Opus retain all channels, while MP3 keeps its mono/stereo output and lets the encoder downmix multi-channel frames.
Tests: