Dear All,
I am trying to stream a live video over rtp/udp, but I'm facing some problems that I do not understand yet.
My sender pipeline is :
gst-launch ksvideosrc ! ffmpegcolorspace ! ffenc_mpeg2video gop-size=1 ! mpegtsmux ! rtpmp2tpay ! udpsink host=127.0.0.1 port=5000
On the receiver side, I have tried to catch the flow with VLC (settings : UDP, 127.0.0.1, port 5000). The player displays the video, but it is very jerky, a lot of blocks in the video frames are corrupted/misplaced.
If I create instead a gst pipeline to receive the rtp flow:
gst-launch udpsrc port=5000 caps="application/x-rtp, media=video, clockrate=90000, encoding-name=MP2TS" ! rtpmp2tdepay ! ffdemux_mpegts !
ffdec_mpeg2video ! ffmpegcolorspace ! directdrawsink
then the video looks ok, but I see a lot of errors in the console:
0:00:00.828115000 5320 009C6488 ERROR ffmpeg .:0:: skipped MB in I frame at 13 6
0:00:00.843740000 5320 009C6488 ERROR ffmpeg .:0:: Warning MVs not available
0:00:04.671816000 5320 009C6488 ERROR ffmpeg .:0:: skipped MB in I frame at 13 6
0:00:04.687440000 5320 009C6488 ERROR ffmpeg .:0:: Warning MVs not available
0:00:04.703065000 5320 009C6488 ERROR ffmpeg .:0:: Warning MVs not available
0:00:05.078060000 5320 009C6488 ERROR
ffmpeg .:0:: skipped MB in I frame at 15 9
0:00:05.093685000 5320 009C6488 ERROR ffmpeg .:0:: ac-tex damaged at 13 6
0:00:05.156184000 5320 009C6488 ERROR ffmpeg .:0:: skipped MB in I frame at 37 10
0:00:05.171809000 5320 009C6488 ERROR ffmpeg .:0:: skipped MB in I frame at 39 26
0:00:05.187434000 5320 009C6488 ERROR ffmpeg .:0:: slice mismatch
(...)
And if I replace ffdemux_mpegts by mpegtsdemux in the receiver (because I used mpegtsmux in the sender), the video is half blurred and jerky.
Does the problem of the video output quality come from the encoding itself? I've tried
with several settings (gop-size, quantizer, bitrate...), none of them made the result better.
Any help is welcomed!
Regards,
Al
(Running gstreamer on windows with gst-winbuilds-0.10.4)
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