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AacFormat: Disable HE-AAC on Android <15 #962

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Merged
chenxiaolong merged 1 commit into from
Oct 13, 2026
Merged

AacFormat: Disable HE-AAC on Android <15 #962

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16 changes: 15 additions & 1 deletion app/src/main/java/com/chiller3/bcr/format/AacFormat.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ package com.chiller3.bcr.format
import android.media.MediaCodecInfo
import android.media.MediaFormat
import android.media.MediaMuxer
import android.os.Build
import java.io.FileDescriptor

class AacFormat : Format() {
Expand Down Expand Up @@ -39,7 +40,20 @@ class AacFormat : Format() {

override fun updateMediaFormat(mediaFormat: MediaFormat, param: UInt) {
mediaFormat.apply {
val profile = if (param >= 32_000u) {
// Android 9, 10, 12, 12L, 13, and 14 have a broken HE-AAC encoder that produces files
// ffmpeg fails to decode with:
//
// [ffmpeg/audio] aac: Reserved bit set.
// [ffmpeg/audio] aac: Number of scalefactor bands in group (48) exceeds limit (40).
//
// Android 11 produces files that ffmpeg fails to decode with:
//
// [ffmpeg/audio] aac: Input buffer exhausted before END element found
//
// VLC also fails to decode these files. Android 15 and newer produce files that play
// back fine without any warnings or errors.
val profile = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.VANILLA_ICE_CREAM
|| param >= 32_000u) {
MediaCodecInfo.CodecProfileLevel.AACObjectLC
} else {
MediaCodecInfo.CodecProfileLevel.AACObjectHE
Expand Down
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