DM355 Performance wiki.pdf

DM355 Measurements
Quality vs Bit-Rate
PSNR(dB)
34
mobcal
(moderate)
mobcal (quality)
32
30
28
parkrun (speed)
26
parkrun
(moderate)
parkrun (quality)
24
1.5 Mbps
•
•
•
mobcal (speed)
2 Mbps
2.5 Mbps
SPEED configuration: MeAlgo =0; SkipMPAlgo=0; IIDC = 0 (0 =Disabled)
QUALITY configuration: MeAlgo =1; SkipMPAlgo=1; IIDC = 1 (1 = Enabled)
MODERATE configuration: MeAlgo =1; SkipMPAlgo=0; IIDC = 0
DM355 Measurements
Process Time /Frame (us)
Speed vs Bit-Rate
•
15500
15000
14500
14000
13500
13000
12500
12000
11500
mobcal (speed)
mobcal(moderate)
mobcal (quality)
parkrun (speed)
parkrun(moderate)
parkrun (quality)
1.5 Mbps
2 Mbps
2.5 Mbps
For MPEG4, 2 Mbps is the bit-rate that is used for most applications. The
following results have all been measured at this bit-rate
DM355 Measurements
•
Analysis of the effect of the MeRange parameter on the Video Quality and the
Processing Speed.
Configuration
SPEED:
MeRange =31,
Mobcal
Parkrun
31.06 dB / 11800 us
25.4 dB / 12300 us
30.44 dB / 10700 us
24.3 dB / 10700 us
30.77 dB / 10400 us
24.45 dB / 10400 us
IntraAlgo=MeAlgo=0
SkipMBAlgo=IIDC =0
MeRange =7,
IntraAlgo=MeAlgo=0
SkipMBAlgo=IIDC =0
MeRange =7,
IntraAlgo=1
MeAlgo=SkipMBAlgo=IIDC =0
•
Conclusion: Using MeRange=7 provides better speed but the PSNR decrease is
significant. It is probably not worthy the loss in PSNR
DM355 Measurements
• Encoder Power Measurement:
– MPEG 4 Simple Profile,
– Standard Definition
– DVTB Capture
• QUALITY
• SPEED
•
•
Power Measured on the DM355
DVEVM board at specific test points
Used Linux DVTB capture application
–
–
–
–
•
Input from Camera
Input Encoded
Encoded output stored to MMC
Run the Speed and Quality
configurations
Difference between Speed and
Quality configurations is only 6 mW
(2.5% core power)
Rail Name
Test
Point
Core (1.3V)
S/Q
TP5
234/240
PLL(1.3V)
TP9
6
DDR1.8V
TP12
45
DDRDLL(3.3V)
TP1
9
IO3.3V
TP11
41
USB1.3V
TP7
6
USB3.3V
TP8
49
DAC1.8
TP13
27
Power (mW)
DM355 Measurements
• Power Measurement:
–
–
–
–
–
MPEG 4 Simple Profile,
Standard Definition
Encode Demo
Decode Demo
Encode/Decode
Rail Name
Test
Point
Power (mW)
Core (1.3V)
E/D/ED
TP5
253/240/273
PLL(1.3V)
TP9
6
DDR1.8V
TP12
45/45/54
DDRDLL(3.3V)
TP1
9
IO3.3V
TP11
41
USB1.3V
TP7
6
USB3.3V
TP8
49
DAC1.8
TP13
27
Chip Total
?
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