OpusConversionTest.md

Opus Conversion Test

Testing is done with different allocation of maximum frame in milliseconds, with 192kbps VBR, maximum encoding complexity, with no expected packet loss during encode.

According to opusenc help menu:

 --framesize n      Set maximum frame size in milliseconds
                      (2.5, 5, 10, 20, 40, 60, default: 20)

--framesize 60

$ opusenc --vbr --bitrate 192 --comp 10 --expect-loss 0 --framesize 60 "01. DEAREST DROP.wav" "01. DEAREST DROP.ogg"

Result:

Encoding using libopus 1.2.1 (audio)
-----------------------------------------------------
   Input: 44.1kHz 2 channels
  Output: 2 channels (2 coupled)
          60ms packets, 192kbit/sec VBR
 Preskip: 312

Encoding complete                                
-----------------------------------------------------
       Encoded: 5 minutes and 4.3 seconds
       Runtime: 7 seconds
                (43.47x realtime)
         Wrote: 7173916 bytes, 5072 packets, 319 pages
       Bitrate: 187.545kbit/s (without overhead)
 Instant rates: 0.666667kbit/s to 309.867kbit/s
                (5 to 2324 bytes per packet)
      Overhead: 0.56% (container+metadata)

--framesize 40

$ opusenc --vbr --bitrate 192 --comp 10 --expect-loss 0 --framesize 40 "01. DEAREST DROP.wav" "01. DEAREST DROP.ogg"

Result:

Encoding using libopus 1.2.1 (audio)
-----------------------------------------------------
   Input: 44.1kHz 2 channels
  Output: 2 channels (2 coupled)
          40ms packets, 192kbit/sec VBR
 Preskip: 312

Encoding complete                                
-----------------------------------------------------
       Encoded: 5 minutes and 4.3 seconds
       Runtime: 7 seconds
                (43.47x realtime)
         Wrote: 7166367 bytes, 7608 packets, 307 pages
       Bitrate: 187.347kbit/s (without overhead)
 Instant rates: 0.6kbit/s to 336kbit/s
                (3 to 1680 bytes per packet)
      Overhead: 0.561% (container+metadata)

--framesize 20 (default option)

Not passing --framesize will default to 20.

$ opusenc --vbr --bitrate 192 --comp 10 --expect-loss 0 "01. DEAREST DROP.wav" "01. DEAREST DROP.ogg"

Result:

Encoding using libopus 1.2.1 (audio)
-----------------------------------------------------
   Input: 44.1kHz 2 channels
  Output: 2 channels (2 coupled)
          20ms packets, 192kbit/sec VBR
 Preskip: 312

Encoding complete                                
-----------------------------------------------------
       Encoded: 5 minutes and 4.3 seconds
       Runtime: 7 seconds
                (43.47x realtime)
         Wrote: 7160829 bytes, 15215 packets, 307 pages
       Bitrate: 187.186kbit/s (without overhead)
 Instant rates: 1.2kbit/s to 380.4kbit/s
                (3 to 951 bytes per packet)
      Overhead: 0.569% (container+metadata)

--framesize 10

$ opusenc --vbr --bitrate 192 --comp 10 --expect-loss 0 --framesize 10 "01. DEAREST DROP.wav" "01. DEAREST DROP.ogg"

Result:

Encoding using libopus 1.2.1 (audio)
-----------------------------------------------------
   Input: 44.1kHz 2 channels
  Output: 2 channels (2 coupled)
          10ms packets, 192kbit/sec VBR
 Preskip: 312

Encoding complete                                
-----------------------------------------------------
       Encoded: 5 minutes and 4.29 seconds
       Runtime: 7 seconds
                (43.47x realtime)
         Wrote: 7075587 bytes, 30429 packets, 307 pages
       Bitrate: 184.968kbit/s (without overhead)
 Instant rates: 2.4kbit/s to 378.4kbit/s
                (3 to 473 bytes per packet)
      Overhead: 0.567% (container+metadata)

--framesize 5

$ opusenc --vbr --bitrate 192 --comp 10 --expect-loss 0 --framesize 5 "01. DEAREST DROP.wav" "01. DEAREST DROP.ogg"

Result:

Encoding using libopus 1.2.1 (low-delay)
-----------------------------------------------------
   Input: 44.1kHz 2 channels
  Output: 2 channels (2 coupled)
          5ms packets, 192kbit/sec VBR
 Preskip: 120

Encoding complete                                
-----------------------------------------------------
       Encoded: 5 minutes and 4.285 seconds
       Runtime: 9 seconds
                (33.81x realtime)
         Wrote: 7166066 bytes, 60857 packets, 307 pages
       Bitrate: 186.565kbit/s (without overhead)
 Instant rates: 4.8kbit/s to 374.4kbit/s
                (3 to 234 bytes per packet)
      Overhead: 0.976% (container+metadata)

--framesize 2.5

$ opusenc --vbr --bitrate 192 --comp 10 --expect-loss 0 --framesize 2.5 "01. DEAREST DROP.wav" "01. DEAREST DROP.ogg"

Result:

Encoding using libopus 1.2.1 (low-delay)
-----------------------------------------------------
   Input: 44.1kHz 2 channels
  Output: 2 channels (2 coupled)
          2.5ms packets, 192kbit/sec VBR
 Preskip: 120

Encoding complete                                  
-----------------------------------------------------
       Encoded: 5 minutes and 4.283 seconds
       Runtime: 10 seconds
                (30.43x realtime)
         Wrote: 7425244 bytes, 121713 packets, 480 pages
       Bitrate: 191.658kbit/s (without overhead)
 Instant rates: 9.6kbit/s to 352kbit/s
                (3 to 110 bytes per packet)
      Overhead: 1.82% (container+metadata)