[opus] Info OPUS encoder

van Bijleveld Christian (ST-CO/ENG1.3) Christian.vanBijleveld at nl.bosch.com
Wed May 15 00:47:15 PDT 2013


I am testing the command line based opus encoder/decoder tools and I have some questions regarding the information given by the encoder (see below as an example).

Encoding using libopus 1.0.2 (audio)
   Input: 48kHz 1 channel
  Output: 1 channel (1 uncoupled)
          20ms packets, 64kbit/sec VBR
 Preskip: 312

Encoding complete
    Encoded: 6.86 seconds
    Runtime: 1e-06 seconds
             (6.86e+06x realtime)
      Wrote: 57354 bytes, 343 packets, 9 pages
    Bitrate: 66.0921kbit/s (without overhead)
 Rate range: 48.8kbit/s to 110.4kbit/s
             (122 to 276 bytes per packet)
   Overhead: 1.19% (container+metadata)

More specifically, I am interesting in knowing how should I interpret the Runtime information '6.86e+06x realtime', the Bitrate detail 'without overhead' and the Overhead figure 1.19%.
I have also a question regarding the delay introduced by OPUS: is the delay from encoder to decoder equal to the audio packet size (in this case, 20ms)? And, what is the minimum encoder-decoder delay that can be achieved with OPUS?
Thanks in advance.

Met vriendelijke groeten | Best Regards,
Christian van Bijleveld

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