Re: [Discuss-gnuradio] Help with video link

[Alexandru Csete]

Hi Alexander,

The de-facto standard way for sending video over the air (assuming you
can't use wifi-like links) is to encapsulate all video and audio into
a single, constant bitrate MPEG transport stream (aka. MPEG-TS). It's
a packetized format designed specifically for transmission over lossy
channels. MPEG-TS is used for DVB-T, DVB-S and probably also ATSC.

If you just want something quick & dirty you can try:
http://www.irrational.net/2014/03/02/digital-atv/

Alex





On Wed, Mar 26, 2014 at 5:42 PM, Alexander Buckley <address@hidden> wrote:
> Hello all,
>
> I am completely stumped with trying to stream video using gnu radio (GRC)
> and the USRP. I have been at it for an absurdly long time without success. I
> could really use some help. (With Unbuntu and the latest UHD/GNU radio)
>
> There has got to be someone who has done this, but so far google is not my
> friend.
>
> I have read so many sites of people looking for help and being given 'help'
> that doesn't work, the internet is now fully spammed when it comes to this
> subject.
>
> After days and days I read things like:
>  'To correctly and completely use the RTP payloaders on the sender and the
> receiver you need to write an application. It is not possible to write a
> full blown RTP server with a single gst-launch-1.0 line.'
> or that player 'x' isn't really player 'x' its a fork due to developers
> fighting and is rather broken..
>
> Most of what I read is about streaming over a network with a constant frame
> rate (adaptive bit rate) which really does not relate well to USRP?
>
>
> I have tried countless permutations of command line strings with various
> options using gstreamer, ffmpeg, vlc. mplayer
> I have tried UDP and File sink/source.
>
> I once I had it nearly working but could not get the player to stream with a
> constant bitrate (which i think usrp would require?). I have lost track of
> which player that was though.
>
>
> At this point I am completely desperate for a a solution. I am looking for
> any solution that works (even badly).
> All I am to do is put together a demo, and it is becoming clear I have no
> idea what I am doing. Either that or this as far far less trivial than one
> would think.
>
> I would greatly appreciate some help here as this endeavour is now becoming
> quite expensive.
>
>
> regards
> Alexander Buckley
>
>
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