title Discussion #916 Message: 2010-01-06 06.40.34 strick
user strick
ip 128.61.105.188
vol 1
lock ********

Measuring SMOKE bytes per 30 seconds:

/tt  gst-launch-0.10 -v -v -m v4l2src ! "video/x-raw-yuv,width=640,height=480,framerate=(fraction)5/1" ! ffmpegcolorspace ! smokeenc keyframe=64 ! identity dump=0 ! smokedec ! xvimagesink sync=false | tr '(),' ' ' | awk '$6="identity0:sink" && $9=="bytes" {b+=$8; print b}'

/tt  gst-launch-0.10 -v -v -m v4l2src ! "video/x-raw-yuv,width=320,height=240,framerate=(fraction)5/1" ! ffmpegcolorspace ! smokeenc keyframe=64 ! identity dump=0 ! smokedec ! xvimagesink sync=false | tr '(),' ' ' | awk '$6="identity0:sink" && $9=="bytes" {b+=$8; print b}'


 Works well:

/tt   gst-launch-0.10 -v -v -m v4l2src ! "video/x-raw-yuv,width=320,height=240,framerate=(fraction)5/1" ! ffmpegcolorspace ! theoraenc  ! rtptheorapay ! identity dump=0 ! rtptheoradepay ! theoradec ! xvimagesink sync=false

But freezes up very often with drop-probability=0.1:

/tt   gst-launch-0.10 -v -v -m v4l2src ! "video/x-raw-yuv,width=320,height=240,framerate=(fraction)5/1" ! ffmpegcolorspace ! theoraenc  ! rtptheorapay ! identity dump=0 drop-probability=0.1 ! rtptheoradepay ! theoradec ! xvimagesink sync=false

Much more usable with "theoraenc keyframe-force=5".

Totalling bytes (this time, kf-f=10):

/tt    gst-launch-0.10 -v -v -m v4l2src ! "video/x-raw-yuv,width=320,height=240,framerate=(fraction)5/1" ! ffmpegcolorspace ! theoraenc keyframe-force=10 ! rtptheorapay ! identity dump=0 drop-probability=0.0 ! rtptheoradepay ! theoradec ! xvimagesink sync=false | tr '(),' ' ' | awk '$6="identity0:sink" && $9=="bytes" {b+=$8; print b}'

Me sitting at camera, moving some, still some, for 30sec from launch to closing xvimage, calculating kilobits per second:
| 30sec 320x240x5/1 ```smoke''' keyframe=64 | 630K bytes | 168 kbps
| 30sec 320x240x5/1 theora keyframe-force=5 | 300K bytes | 80 kbps
| 30sec 320x240x5/1 theora keyframe-force=10 | 200K bytes | 53 kbps
| 30sec 320x240x5/1 theora keyframe-force=64 | 175K bytes | 47 kbps
| | |
| 30sec 640x480x5/1 ```smoke''' keyframe=64 | 1635K bytes | 436 kbps
| 30sec 640x480x5/1 theora keyframe-force=5 | 750K bytes | 200 kbps
| 30sec 640x480x5/1 theora keyframe-force=10 | 600K bytes | 160 kbps
| 30sec 640x480x5/1 theora keyframe-force=64 | 520K bytes | 139 kbps

By copying and pasting the capability, I can use a udpsink-udpsrc pipeline.
Both sides seem to be able to stop & restart smoothly:
* /file theora-640x480x5.sh

/i So how can I capture those capabilities with Python, and make them available out-o