Hello.
Please, Can somebody tell me what means play/CPU in LAME log after encoding wav 2 mp3? And why it is not showed after decoding mp3 2 wav? Is there any way how to display it after decoding. I have tried to found it by google but unsuccessfully. Thank you for information (and sorry for my English)
Full Version: What means play/CPU showed in LAME log?
Hi Addam,
to my knowledge, it's the ratio about how fast the encoding is happening compared to real time playback, so eg. a 4 minutes long song gets encoded in 1 minute, resulting in 4x play/CPU ratio
it can be displayed during encoding when the --verbose flag is given to lame.exe
Just in case, I'm doing an Ace Ventura here, anybody with in-depth knowledge feel free to correct me.
Cheers,
Maggi
PS: here's an example of the --verbose output
to my knowledge, it's the ratio about how fast the encoding is happening compared to real time playback, so eg. a 4 minutes long song gets encoded in 1 minute, resulting in 4x play/CPU ratio
it can be displayed during encoding when the --verbose flag is given to lame.exe
Just in case, I'm doing an Ace Ventura here, anybody with in-depth knowledge feel free to correct me.
Cheers,
Maggi
PS: here's an example of the --verbose output
CODE
==> Priority set to Low.
LAME 3.97 32bits (http://www.mp3dev.org/)
CPU features: MMX (ASM used), 3DNow! (ASM used), SSE (ASM used), SSE2
polyphase lowpass filter disabled
Encoding D:\Chiko-Trailer.wav
to D:\Chiko-Trailer.wav.mp3
Encoding as 48 kHz VBR(q=0) j-stereo MPEG-1 Layer III (ca. 5.7x) qval=0
misc:
scaling: 1
ch0 (left) scaling: 0
ch1 (right) scaling: 0
filter type: 0
quantization: xr^3/4
huffman search: best (outside loop)
experimental Y=0
...
stream format:
MPEG-1 Layer 3
2 channel - joint stereo
padding: all
variable bitrate - VBR rh (default)
using LAME Tag
...
psychoacoustic:
using psychoacoustic model: 1
psychoacoustic model: NSPsytune
tonality estimation limit: 8871.700195 Hz (not relevant)
using short blocks: channel coupled
subblock gain: 1
adjust masking: -4.2 dB
adjust masking short: -6.3 dB
quantization comparison: 9
^ comparison short blocks: 9
noise shaping: 1
^ amplification: 2
^ stopping: 1
ATH: using
^ type: 4
^ shape: 1 (only for type 4)
^ level adjustement: -0.48
^ adjust type: 3
^ adjust sensitivity power: 1.000000
^ adapt threshold type: 2
experimental psy tunings by Naoki Shibata
adjust masking bass=0 dB, alto=0 dB, treble=0 dB, sfb21=5.25 dB
using temporal masking effect: yes
interchannel masking ratio: 0
...
Frame | CPU time/estim | REAL time/estim | play/CPU | ETA
4000/4046 (99%)| 0:11/ 0:11| 0:11/ 0:11| 8.6168x| 0:00
32 [ 0]
40 [ 1] *
48 [ 0]
56 [ 5] *
64 [ 10] *
80 [ 19] *
96 [ 50] **
112 [ 427] *************
128 [ 741] **********************
160 [2331] ********************************************************************
192 [ 397] ************
224 [ 19] *
256 [ 0]
320 [ 0]
-------------------------------------------------------------------------------
kbps MS % long switch short %
150.8 100.0 96.9 1.8 1.4
LAME 3.97 32bits (http://www.mp3dev.org/)
CPU features: MMX (ASM used), 3DNow! (ASM used), SSE (ASM used), SSE2
polyphase lowpass filter disabled
Encoding D:\Chiko-Trailer.wav
to D:\Chiko-Trailer.wav.mp3
Encoding as 48 kHz VBR(q=0) j-stereo MPEG-1 Layer III (ca. 5.7x) qval=0
misc:
scaling: 1
ch0 (left) scaling: 0
ch1 (right) scaling: 0
filter type: 0
quantization: xr^3/4
huffman search: best (outside loop)
experimental Y=0
...
stream format:
MPEG-1 Layer 3
2 channel - joint stereo
padding: all
variable bitrate - VBR rh (default)
using LAME Tag
...
psychoacoustic:
using psychoacoustic model: 1
psychoacoustic model: NSPsytune
tonality estimation limit: 8871.700195 Hz (not relevant)
using short blocks: channel coupled
subblock gain: 1
adjust masking: -4.2 dB
adjust masking short: -6.3 dB
quantization comparison: 9
^ comparison short blocks: 9
noise shaping: 1
^ amplification: 2
^ stopping: 1
ATH: using
^ type: 4
^ shape: 1 (only for type 4)
^ level adjustement: -0.48
^ adjust type: 3
^ adjust sensitivity power: 1.000000
^ adapt threshold type: 2
experimental psy tunings by Naoki Shibata
adjust masking bass=0 dB, alto=0 dB, treble=0 dB, sfb21=5.25 dB
using temporal masking effect: yes
interchannel masking ratio: 0
...
Frame | CPU time/estim | REAL time/estim | play/CPU | ETA
4000/4046 (99%)| 0:11/ 0:11| 0:11/ 0:11| 8.6168x| 0:00
32 [ 0]
40 [ 1] *
48 [ 0]
56 [ 5] *
64 [ 10] *
80 [ 19] *
96 [ 50] **
112 [ 427] *************
128 [ 741] **********************
160 [2331] ********************************************************************
192 [ 397] ************
224 [ 19] *
256 [ 0]
320 [ 0]
-------------------------------------------------------------------------------
kbps MS % long switch short %
150.8 100.0 96.9 1.8 1.4
That is my understanding of it as well. I also remember it being pointed out that under some operating systems the CPU time value is inaccurate (I think it may have been elapsed rather than CPU time), but I don't remember which ones.
Thanks for explanation. And it is possible to add this into log after decoding mp3 to wav?
QUOTE(pdq @ Mar 31 2008, 18:21) 
... I also remember it being pointed out that under some operating systems the CPU time value is inaccurate (I think it may have been elapsed rather than CPU time), but I don't remember which ones.
I see that behavior on WinXP for sure, but I seem to recall it was also present on Win2k.
As it is now, CPU time/estim always equals REAL time/estim, which cannot be right, because depending on the workload your system is handling, the CPU time/estim should always be less than REAL time/estim. The taskmanager's column "CPU Time" shows the proper CPU usage time of lame.exe though.
QUOTE(Addam @ Mar 31 2008, 18:39)
Thanks for explanation. And it is possible to add this into log after decoding mp3 to wav?
Do you really mean a playback speed ratio when rendering MP3 to WAV or rather vice versa and adding the verbose output I posted above into a log file ?
Cheers,
Maggi
It can be verbose output (if it is necessarily) whitch you posted but it needn't . But I only need to add this parameter (play/CPU) into log after decoding and i don't know how because iam not skilled programmer and I don't know how to modify source code (i thing that this part is in timestatus.c). Thank you for tip with task manager.
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