[Red5] Bandwidth throttling within Red5.

[Interalab]

The problem is not with the screen video as far as we can tell. This is 
a problem that has been there for a long time and seems to be brought up 
in various contexts and circumstances. Here's what we see as the 
consistent factors:

- using VP6 (whether it's FME or a custom VP6 encoder as in our case)
- live video encoding/streaming, not VOD.
- higher quality settings on the encoder (we haven't pegged the bitrate, 
but our problems are occurring with a 400kbps stream at 15 fps)
- no load on the server memory or CPU or bandwidth (we're on a gigabit 
internal and external)

To solve it, we have modified the Red5 server code (as posted a few days 
ago for comment). See below.

As far as we can see, Red5 doesn't understand what the VP6 codec is, so 
videoCodec is seen as null. Using the following modification we make it 
do nothing if videoCodec is null and it seems to have fixed our problem, 
but I think it might have just masked some other issue.

Comments welcome . . .

--- .svn/text-base/PlaylistSubscriberStream.java.svn-base	2007-12-05 05:27:04.000000000 -0500
+++ PlaylistSubscriberStream.java	2007-12-06 11:37:58.000000000 -0500
@@ -1889,6 +1889,8 @@
 					}
 
 					if (videoCodec == null || videoCodec.canDropFrames()) {
+						if(videoCodec == null) {
+						} else {
 						if (state == State.PAUSED) {
 							// The subscriber paused the video
 							videoFrameDropper.dropPacket(rtmpMessage);
@@ -1925,6 +1927,7 @@
 						}
 						
 						videoFrameDropper.sendPacket(rtmpMessage);
+						}
 					}
 				} else if (body instanceof AudioData) {
 					if (!receiveAudio && sendBlankAudio) {




Andy wrote:
>
> Try this screen video broadcaster....Of course point it to your red5 
> server ;)
>
> I have no trouble at high bandwidth with screen video. FME hasn’t 
> given me satisfying results... yet.
>
> -----Original Message-----
> *From:* red5-bounces at osflash.org [mailto:red5-bounces at osflash.org] *On 
> Behalf Of *Mr Seb
> *Sent:* Sunday, December 09, 2007 12:15 PM
> *To:* red5 at osflash.org
> *Subject:* Re: [Red5] Bandwidth throttling within Red5.
>
> I’m using FME.
>
> The output from FME is a steady 15 FPS (or whatever I set it to), 
> using whatever bit rate I set it to.
>
> Anything over the 350kbs preset and I suddenly start hitting 
> InsufficientBW errors.
>
> I’m running the Red5 server remotely – on a linux box. But it’s 
> collocated on 100mbits, and the CPU is not under any load.
>
> As far as I can tell, there’s no hardware limitations in the equation.
>
> I haven’t tried running it locally – I guess I can try that. But I 
> don’t know what that proves, if there is plenty of bandwidth available 
> on the remote box!
>
> I was wondering if perhaps the default buffer sizes can’t cope with a 
> high-resolution (720*576) stream at 15 FPS… but… I really don’t know :)
>
> The content is the live, stream of the display of my computer. No 
> audio (yet).
>
> -S
>
> ------------------------------------------------------------------------
>
> *From:* red5-bounces at osflash.org [mailto:red5-bounces at osflash.org] *On 
> Behalf Of *Andy
> *Sent:* 09 December 2007 20:10
> *To:* red5 at osflash.org
> *Subject:* Re: [Red5] Bandwidth throttling within Red5.
>
> There are none.
>
> Do you get the same response running it locally?
>
> Or are you already?
>
> Are you using FME? I find it spurts where the screen video capture is 
> a steady dribble.
>
> I have better luck live, with screen video.
>
> andy
>
> -----Original Message-----
> *From:* red5-bounces at osflash.org [mailto:red5-bounces at osflash.org] *On 
> Behalf Of *Mr Seb
> *Sent:* Sunday, December 09, 2007 11:56 AM
> *To:* red5 at osflash.org
> *Subject:* [Red5] Bandwidth throttling within Red5.
>
> Hi,
>
> Could someone walk me through how to ensure there is absolutely no 
> bandwidth/stream bit rate limits in place?
>
> I’m pretty sure the default red5-trunk install has none in place, but 
> I’m really out of guesses on why the oflaDemo won’t let me stream 
> anything over 350kbit/sec without a lot of NetStream.InsufficientBW 
> errors popping up.
>
> Of course, if someone has managed to make an ‘unlimited’ oflaDemo, I’m 
> interested in that too!
>
> Cheers,
>
> -S
>
> ------------------------------------------------------------------------
>
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>