[[gstreamer_video_compression]]

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gstreamer_video_compression [2020/04/16 01:50]
wf68spef created
gstreamer_video_compression [2020/04/17 10:49] (current)
wf68spef
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 To be able to efficiently send the image data over a wireless datalink, one option is to compress the video data using h264/h265 encoders. Those two are often implemented in a hardware-accelerated way on the onboard computers like RPI and Jetson Nano. We can use these encoders to compress the video data to about 1000kBit/s and keep some kind of acceptable quality in the images to be processed by the image analysis algorithms ( to be tested! ) on a basestation computer. To be able to efficiently send the image data over a wireless datalink, one option is to compress the video data using h264/h265 encoders. Those two are often implemented in a hardware-accelerated way on the onboard computers like RPI and Jetson Nano. We can use these encoders to compress the video data to about 1000kBit/s and keep some kind of acceptable quality in the images to be processed by the image analysis algorithms ( to be tested! ) on a basestation computer.
 +These kind of compression is also used in existing solutions mentioned in https://​www.hs-augsburg.de/​homes/​beckmanf/​dokuwiki/​doku.php?​id=searchwing-wifibroadcast.
  
 ====== Tests ====== ====== Tests ======
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 Images are still looking okay for a human beeing. If the algorithms are also okay with that reduced quality need to be tested. ​ Images are still looking okay for a human beeing. If the algorithms are also okay with that reduced quality need to be tested. ​
  
 +{{ :​comparison.png?​1000 |}}
  
-H264s filesize is in line with to the specified bitrate. ​ H265 somehow is ~4x bigger that the specified bitrate, there is still some error to find. +H264s filesize is in line with to the specified bitrate. ​ H265 somehow is ~4x bigger that the specified bitrate ​and also the quality is not really better than H264so there are still some errors ​to find.  
 + 
 +Testimages and results can be found here: https://​cloud.hs-augsburg.de/​s/​sm6taLQCAyWMY6F 
 + 
 +====== Image compression in general ====== 
 + 
 +  *  [[https://​ieeexplore.ieee.org/​document/​818515|Comparison of lossless image compression algorithms]]
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