[Mp4-tech] [Audio] Bitrate from ADTS

[Ralph Sperschneider]

Mody, Mihir wrote:
> Hi Ann,
> 
> As AAC ADTS format doesn't have bitrate information, you have to use other means. The framelength of given audio frame will give you instantaneous bit-rate (as frame_length (in byte) * 8 * sampling frequency/1024). You can average out this bit-rate over certain number (say N) of frames to find out average bitrate. 
> 

Or one could use the subsequent information on the bit reservoir status to 
compute the mean frame length (just not bit exact, since the state of the bit 
reservoir is rounded).
Ralph
-- 
Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
Fraunhofer IIS                  | Fax:   +49 9131 776 398
Am Wolfsmantel 33               | mailto:ralph.sperschneider iis.fraunhofer.de
D 91058 Erlangen                | http://www.iis.fraunhofer.de/amm/