Hi everyone,
I want to compute the perceived QoS when streaming a video over a lossy network.
To do that I'm streaming a video over a wireless network and I record the video sent and the video received.
Here is the pipeline I have used (here I use an input stream but I could use webcam) :
# on the server :
gst-launch -e filesrc location=some_moivie.mp4 ! decodebin ! ffmpegcolorspace ! queue ! videorate ! video/x-raw-yuv,framerate=5/1 ! ffenc_mpeg2video quantizer=4 gop-size=1 ! tee name=l ! queue ! mpegtsmux ! rtpmp2tpay ! udpsink host=192.168.0.10 port=5001 l. ! queue ! filesink location=videosrc.mpeg
# on the client:
gst-launch -e udpsrc port=5001 caps="application/x-rtp, media=video, encoding-name=MP2T-ES" ! rtpmp2tdepay ! mpegtsdemux ! tee name=t ! queue ! ffdec_mpeg2video ! ffmpegcolorspace ! xvimagesink t. ! queue ! filesink location=videodst.mpeg
Due to packet losses some frames are missing in the video received (videodst.mpeg), which is what I expected :)
Then I want to compute a QoS measure to compare the two videos.
I want to use SSIM that compares frames one by one.
Since some frames are missing on the received video, this is not so easy.
My questions are then :
- is there a gstreamer element that would put some dummy frame when one is missing ? With such element the two videos would have the same number of frames
- how can I know when a frame is missing in the received video ?
sorry if this is not the right place to ask these questions
thank you very much for your time
Maxime
--
Maxime Louvel
web page :
https://sites.google.com/site/mlouvel/linkedin :
http://fr.linkedin.com/in/mlouvel
address : 5400-B ridge oak drive
Austin, Texas, 78731
USA
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