On 04/07/15 17:52, Christian Robottom Reis wrote: > Hello there, > > We've been working on a project to stream a screencast from an x86 > machine with a gigabit NIC to half a dozen Raspberry Pi devices (with > fast ethernet NICs) connected to TV screens. Our plan is to send a > multicast UDP to omxplayer on the client side. However, we've stumbled > upon a problem: streaming using avconv from the gigabit host to the rpi > is resulting in dramatic (30%+) packet loss on the rpi side. > > The setup to reproduce the issue is fairly simple. On the x86 side, > we stream something via UDP: > > avconv -re -i big_buck_bunny_1080p_h264.mov -f mpegts udp://pi:8765/ > > and on the rpi side we try and play that stream with omxplayer, which > renders the video with artifacts (green and grey pixelated video, > vertical stripes, etc) typically present when there is packet loss. > > With tcpdump we can actually confirm that 30% of the packets being sent > never hit omxplayer. The question we've been unable to answer is where > are the packets being dropped -- neither ifconfig nor netstat -us can > match the actual number of lost packets, which we can tell by capturing > on both sender and receiver.
You need to tune your udp system buffers so packets do not end lost because either buffer can't keep up with them. -buffer_size 2M should be enough to fix it. lu _______________________________________________ libav-tools mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-tools
