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Performance Measurement on Decode Encode Demo
Contents
Latency Measurement for Decode Encode Demo application[edit]
This is the latency measurements performed on the sample decode encode demo delivered along with the EZSDK 5.x for DM816x and DM814x devices from TI. The demo is created with the chain VDEC->VENC . This demo is validated on EZSDK 5.03.01.15 and OMX components 5.02.00.30.
The latency numbers are measured for the following resolutions:
- 1080p @60
- 720p @60
- D1 @ 30
Usecase Description[edit]
Sample H.264 stream stored in a SD Card is decoded by the VDEC OMX Decoder component. The decoded frame is then passed to VENC and the encoded frame is written back to the SD card. A good quality SD card with class 10 is recommended to be used in this usecase
Setup Details[edit]
DM816x Base EVM DM816x Rev-C with DDR3.
OMX Components Details[edit]
Following are the list of OMX components used in the usecase:
- VENC (Video Encode Component)
- VDEC (Video Decode Component)
Measurement Procedure[edit]
- The IL-client is executed on ARM side and the corresponding firmware binaries are loaded on the Video and VPSS media controller cores.
- Timestamps corresponding to various OMX component events for consecutive frames are logged for latency measurements
- T1 - Timestamp when VDEC starts decoding the frame
- T2 - Timestamp when VDEC finish decoding the frame
- T3 - Timestamp when VENC finish encoding the frame
- T4 - Timestamp when VDEC starts decoding the frame
- From the above timestamps, Running average of various latency values are measured
- Running average: Series of averages is calculated for a fixed window period (8 Frames) of different subsets of the full data set and final average is calculated from the average series
Results[edit]
- Detailed latency performance results are available here Media:DM816x_Decode_Encode_demo_latency_performance.zip
Summary[edit]
Metrics
- Decode Latency = T2–T1
- Encode Latency = T4–T3
- Decode-Encode Latency = T4–T1
Download the Latest EZSDK[edit]
The latest EZSDK is available for download from http://software-dl.ti.com/dsps/dsps_public_sw/ezsdk/latest/index_FDS.html.
The current version is 5.05.02.00. The supported platforms are DM816x and DM814x.
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