Repeater Streaming - Revision history

G8GKQ at 20:31, 21 August 2017

2017-08-21T20:31:44Z

G8GKQ at 20:40, 20 August 2017

2017-08-20T20:40:16Z

G8GKQ at 20:38, 20 August 2017

2017-08-20T20:38:58Z

G8GKQ at 14:19, 16 August 2017

2017-08-16T14:19:06Z

G8GKQ at 14:13, 16 August 2017

2017-08-16T14:13:42Z

G8GKQ at 21:31, 9 August 2017

2017-08-09T21:31:43Z

G8GKQ at 21:08, 9 August 2017

2017-08-09T21:08:48Z

G8GKQ: Created page with "===Introduction=== The Portsdown software includes a repeater streaming mode. While this is under development here are some notes: If you have a noise-free (digital in and..."

2017-08-09T20:58:33Z

Created page with "===Introduction=== The Portsdown software includes a repeater streaming mode. While this is under development here are some notes: If you have a noise-free (digital in and..."

New page

===Introduction===

The Portsdown software includes a repeater streaming mode. While this is under development here are some notes:

If you have a noise-free (digital in and out) signal, the default settings should work well for you.

If you have a digital output at least your syncs should be good. More info to come.

If you have a noisy analog signal that you want to stream, your first priority should be to clean up the syncs. Use a decent sync inserter. Options include the one described in CQ-TV 129 or a GTH Electronics Advanced Digital Converter and Video Enhancer.

Next step for a noisy analog signal is to take the colour off it. Noisy colour causes real problems with building up latency and the picture is a lot more watchable if you can cut it out. If you are unable to cut it out in hardware try the software method below.

===Customising the Software===

You can easily modify the Portsdown software to suit your own input signal. The critical statement is at about line 841 of the file /home/pi/rpidatv/scripts/a.sh. This defines how the ffmpeg command codes the video for streaming. The parameter that needs changing is the video filter; this is defined in the quotes after -vf.

The default code is
"format=yuyv422,yadif=0:1:0"
This tells the encoder to use yuyv422 format and to reverse the interlace fields; yadif is "yet another de-interlace filter" and this command corrects for the fact that the Fushicai EasyCap outputs PAL interlaced fields bottom field first, when it should be top field first.

If you have a noisy signal, the best combination that I have found is:

← Older revision		Revision as of 20:31, 21 August 2017
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	This (-vf "....")line can be changed and then used straight away, but you should keep an eye on the processor load by running another Putty window with htop in it. Start to worry if any of the 4 cores spends significant time above 50% or if the video develops excessive delay.		This (-vf "....")line can be changed and then used straight away, but you should keep an eye on the processor load by running another Putty window with htop in it. Start to worry if any of the 4 cores spends significant time above 50% or if the video develops excessive delay.
		+
		+	Using at a rate of 800K, G8BYI has had good results streaming GB3UT using these settings:
		+
		+	-vf "format=yuyv422,yadif=0:1:0, hqdn3d=15:15:15:15" -g 25

	===Reducing the Streaming Rate===		===Reducing the Streaming Rate===

← Older revision		Revision as of 20:38, 20 August 2017
Line 26:		Line 26:

	This (-vf "....")line can be changed and then used straight away, but you should keep an eye on the processor load by running another Putty window with htop in it. Start to worry if any of the 4 cores spends significant time above 50% or if the video develops excessive delay.		This (-vf "....")line can be changed and then used straight away, but you should keep an eye on the processor load by running another Putty window with htop in it. Start to worry if any of the 4 cores spends significant time above 50% or if the video develops excessive delay.
		+
		+	===Reducing the Streaming Rate===
		+
		+	To reduce the streaming rate, you can edit the file scripts/a.sh. Line 854 for the video rate, and the next line for the audio.

	You can find details of the Hardware-switched video streaming facility introduced in software 201708150 here [[Streaming to batc.tv with Raspberry Pi]].		You can find details of the Hardware-switched video streaming facility introduced in software 201708150 here [[Streaming to batc.tv with Raspberry Pi]].

← Older revision		Revision as of 14:19, 16 August 2017
Line 27:		Line 27:
	This (-vf "....")line can be changed and then used straight away, but you should keep an eye on the processor load by running another Putty window with htop in it. Start to worry if any of the 4 cores spends significant time above 50% or if the video develops excessive delay.		This (-vf "....")line can be changed and then used straight away, but you should keep an eye on the processor load by running another Putty window with htop in it. Start to worry if any of the 4 cores spends significant time above 50% or if the video develops excessive delay.

−	~~Coming soon:~~ Hardware-switched video streaming.	+	You can find details of the Hardware-switched video streaming facility introduced in software 201708150 here [[Streaming to batc.tv with Raspberry Pi]].

@@ Line 23: / Line 23: @@
 This takes out the interlace correction which is very processor hungry and so gives us some spare capacity.  It adds the "high quality de-noising 3D" filter with heavy de-noising.  Details here: http://avisynth.nl/index.php/Hqdn3d.
-It also gets rid of the colour information.  Details here: https://wjwoodrow.wordpress.com/2015/07/12/more-ffmpeg-hell/
+It also gets rid of the colour information.  Details here: https://wjwoodrow.wordpress.com/2015/07/12/more-ffmpeg-hell/  To leave the colour in, just delete the "eq=1:0:0:1:1:1:1:1" part.
 This (-vf "....")line can be changed and then used straight away, but you should keep an eye on the processor load by running another Putty window with htop in it.  Start to worry if any of the 4 cores spends significant time above 50% or if the video develops excessive delay.
 Coming soon:  Hardware-switched video streaming.

@@ Line 20: / Line 20: @@
 If you have a noisy signal, the best combination that I have found is:
-  -vf "format=yuyv422,hqdn3d=100:100:100:100,eq=1:0:0:1:1:1:1:1"
+  -vf "format=yuyv422,hqdn3d=50:50:50:50,eq=1:0:0:1:1:1:1:1"
 This takes out the interlace correction which is very processor hungry and so gives us some spare capacity.  It adds the "high quality de-noising 3D" filter with heavy de-noising.  Details here: http://avisynth.nl/index.php/Hqdn3d.

@@ Line 13: / Line 13: @@
 ===Customising the Software===
-You can easily modify the Portsdown software to suit your own input signal.  The critical statement is at about line 841 of the file /home/pi/rpidatv/scripts/a.sh.  This defines how the ffmpeg command codes the video for streaming.  The parameter that needs changing is the video filter; this is defined in the quotes after -vf.
+You can easily modify the Portsdown software to suit your own input signal.  The critical statement is at about line 856 of the file /home/pi/rpidatv/scripts/a.sh.  This defines how the ffmpeg command codes the video for streaming.  The parameter that needs changing is the video filter; this is defined in the quotes after -vf.
 The default code is

@@ Line 16: / Line 16: @@
 The default code is
-  "format=yuyv422,yadif=0:1:0"
+  -vf "format=yuyv422,yadif=0:1:0"
 This tells the encoder to use yuyv422 format and to reverse the interlace fields; yadif is "yet another de-interlace filter" and this command corrects for the fact that the Fushicai EasyCap outputs PAL interlaced fields bottom field first, when it should be top field first.
 If you have a noisy signal, the best combination that I have found is: