Feature Request - MP4 bitrate control property

Yannis Calotychos ycalot at gmail.com
Tue Jun 3 13:28:34 BST 2025


Hello,

As there doesn’t seem to be a way to enumerate MP4 file atoms (correct me if I'm wrong), it would be nice to have the bitrate control value as a class property (same way as the codec property).

This information is stored in the ‘acbf’ atom as UInt32, and can take a value of:
	kAudioCodecBitRateControlMode_Constant					= 0,
	kAudioCodecBitRateControlMode_LongTermAverage			= 1,
	kAudioCodecBitRateControlMode_VariableConstrained		= 2,
	kAudioCodecBitRateControlMode_Variable					= 3,


Thank you
Yannis Calotychos.


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