Quote:
Originally Posted by Warren Boudreau
So far I have been less than impressed with the ustream.tv feed.
Any hope of getting some good webcasts???
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Which webcasts have you watched? What kbps and codec did they use? What was the video process chain in use at the event. All of these effect precieved resolution.
One comment I recieved on the GSR webcast on ustream.tv was "wow, I can read the team numbers (at the bottom of the screen)". When transmitted at 350kpbs and utilizing a DV25 input stream the video was fairly decent. I pushed upwards of 450kbps uplink speeds, but downlink either due to ustream or local viewers networks (including my own monitor system at the event) showed jerkiness in playback. The main issue though is reliable uplink speed limitations. I had a 2000kbps uplink but still had problems maintaining streaming much beyond 350kbps. Throughput wasn't the only thing effecting streaming, latency was often as big an issue. I suppose a high-end hardware based realtime h.264 encoder might be able to achieve better streaming results with limited kbps bandwidth, but it all comes down to how many bits you can stream reliably and that is not limited by the remote server but is more effected by the uplink network in use.
If NASA has an mms server then I'd like to do some trial broadcasts on it for next season. With an mms server I'd at least be able to choose my own codec, but I'd still likely use the MainConcept codec as used by Adobe FME as it is commonly on all recieving systems already although the CoreADVC codec is suppose to produce better run-time h.264 stream results (results were alot better than the x264 based FFmpeg tool chain in the latest 2009 streaming shootout).
Thanks,
bud
PS by comparison the archived footage is being targetted at 1000kbps-1250kbps, or 3x-4x as much data. So there isn't a fair comparison between webcast and archived footage. I prefer 1600-2000kps archive footage, but then I have old eyes.
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http://www.thenulldevice.net/Team0000/GSR2009/Videos/ - _540v are @1600kbps ~30MB/match and _720v are @2000kbps ~38MB/match these were converted from DV25 [25Mbps/~550MB file] snaps taken while webcasting).