Hello Khyrul, looking forward to see your proposal :)
On Sat, Mar 19, 2016 at 12:16 PM, khyrul Bashar <[email protected]> wrote: > Hi Sebastian, > > FFMPEG link was a great help, Thanks. > > I've few questions, > Is quality of low, medium, and high bandwidth streams constant? i.e. like > in youtube if the original is at most 720p then subsequent predefined lower > qualities are available e.g. 480p, 360p etc. Or is it we always try to > create three streams as high, medium and low starting from the original as > high? IMHO former approach is better as the implement is easier and > the outcome is always predictable. What do you think? > > Where can I get the video settings sent from the client side and server > side in OpenMeetings? > > I'm going to start writing the proposal very soon which I'll improve > gradually until the deadline. Anything you want me to focus on and any > suggestions? > > Thanks > Khyrul Bashar > > On Tue, Mar 15, 2016 at 3:11 AM, [email protected] < > [email protected]> wrote: > > > Hi Khyrul, > > > > I think there are some interesting aspects of this task. I think your > > approach in general sounds good, and you are right, the latency will be a > > major bottleneck for the solution. > > > > Around FFMPEG real time transcoding you might want to look at: > > https://trac.ffmpeg.org/wiki/StreamingGuide > > > > So it might be possible to simply re-stream the stream from Red5 to > FFMPEG, > > FFMPEG transcodes it and publishes it again, and you re-stream from > FFMPEG > > to Red5 then to the conference room. > > > > Thanks, > > Sebastian > > > > 2016-03-14 21:51 GMT+13:00 khyrul Bashar <[email protected]>: > > > > > Hy, > > > Sorry if it's a duplicate. I've sent previous one before subscribing. > I'm > > > Khyrul Bashar, 4th year CSE student from Bangladesh. I've participated > > > successfully in GSoC-2015. I've coded the PDFDebuuger app of PDFBox > > project > > > in apache foundation. > > > This year I hope to code Openmeetigns-550. I find it an interesting > > problem > > > but to solve available documentation resources is almost none like the > > > issue says "there is hardly any documentation on that available in the > > > internet". So far I've build the OpenMeetings source code and gone > > through > > > the source code in brief. > > > I'm trying to understand how the Openmeetings conference live streaming > > > works. This is I've understood so far, in client side flash 'publish' > the > > > media and in server side that other clients in same scope is made aware > > > about the video. ScopeApplicationAdapter class which has extended > > > ApplicationAdapter class of Red5 gets notified on a new video stream in > > > 'streamPublishStart' method. And from there Openmmetings messages other > > > concerned clients via their 'Connection'. In flash client side upon > > > receiving the message the video is playback. All the necessary url, > port > > > are stored in 'FlexGlobals.topLevelApplication', One thing I don't > > > understand how "FlexGlobals.topLevelApplication" data are populated in > > the > > > first place. Pardon me if it's trivial, I've read the ActionScript > code > > > today for the first time. > > > Now my understanding of the issue is, we have to implement a way so the > > > video published by the client is available in three resolution (low, > > > medium, high) to other clients in the same room. As red5 takes care of > > > handling the live streaming itself(it's my understanding), to make any > > > versions of the video but original available we need to intervene in > the > > > middle. e.g. like recording we add stream listener and from there data > is > > > pulled using 'StreamPacket'. From this, we make an input for an FFmpeg > > > command which gives us transcoded videos as our requirement. Then those > > > outputs are relayed to other clients according to their demand. > > > I'm concerned about this approach as there is a real chance for latency > > as > > > one more step is added in the middle. Again as for the last three > days, I > > > spent most of the time just to understand red5 and yet not really > > confident > > > (thanks to red5 documentations!), I haven't really chance to look at > > FFmpeg > > > workings, so I'm not sure, how the data received from the client is > made > > > available to FFmpeg to transcode. I would appreciate some guidance > here. > > > Please feel free to correct my understanding of the problem and > > application > > > architecture. > > > > > > Thanks > > > Khyrul Bashar > > > > > > PS: Why Red5 documentations are so rare? I'm not complaining just > > curious. > > > Red5 seems a decent media server used by many e.g. facebook. > > > > > > > > > > > -- > > Sebastian Wagner > > https://twitter.com/#!/dead_lock > > [email protected] > > > -- WBR Maxim aka solomax
