[yashranaway]

the aac encoder picks the lowest supported rate at or above the input rate, and if none was high enough it fell back to the first entry of the sorted list, which is 7.35 khz. so audio from a 192 khz interface got squashed down to 7.35 khz and lost everything above about 3.5 khz.

now the fallback is the highest supported rate, 96 khz. inputs the codec already supports are unchanged. tests check the chosen rate for low, normal and too high inputs, and push a 12 khz tone at 192 khz through encode and decode to make sure it survives.

Confidence Score: 5/5

This PR appears safe to merge.

Summary

High-rate AAC inputs now fall back to the highest supported sample rate instead of the lowest.

• AAC encoding keeps high-rate inputs at the codec’s highest supported rate.

Reviewed statically; tests were not run.

_{Reviews (1) · Last reviewed commit: "fix(enc-ffmpeg): preserve AAC quality fo..." · Reviewed by Greptile}

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[yashranaway]

@greptileai review