Transport Stream as vMix Input Options  Watch this topic  Print this topic » Normal Threaded

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Tonysal123		#1 Posted : Thursday, September 10, 2015 12:17:59 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Good Day, Been testing the trial version of vMix, so far so good. One question- we are trying to input a transport stream via ip from a Cisco Satellite Receiver/Decoder, it is a multicast with an address of Udp:\\244.251.251.091:1001, the network is private @ 192.168.90.x . Using a DecTek TS Analyzer we can verify the signal is present, but having no luck with vMix- also tried unicast, vMix TS TCP & TS UDP. Looking at the vMix docs, rtp protocol is supported, any help would be greatly appreciated. Thx, T
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admin		#2 Posted : Thursday, September 10, 2015 12:38:18 PM(UTC)
Rank: Administration Groups: Administrators Joined: 1/13/2010(UTC) Posts: 5,210 Location: Gold Coast, Australia Was thanked: 4290 time(s) in 1520 post(s)		What is the video format of the transport stream? vMix only supports H264 for video and AAC for audio in either a Transport Stream or RTSP stream. Regards, Martin vMix
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Tonysal123		#3 Posted : Thursday, September 10, 2015 1:31:15 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Output of Cisco is H.264.
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Tonysal123		#4 Posted : Thursday, September 10, 2015 7:02:14 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Martin, Perhaps it would be helpful to us if you could provide a simple procedure of a transport stream (UDP/TCP) vMix (screenshot) settings from an example/previous project you encountered. Thx, T
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admin		#5 Posted : Friday, September 11, 2015 5:18:27 AM(UTC)
Rank: Administration Groups: Administrators Joined: 1/13/2010(UTC) Posts: 5,210 Location: Gold Coast, Australia Was thanked: 4290 time(s) in 1520 post(s)		If it is broadcasting to a particular port, select Transport Stream over UDP and type in the port number. Also try verifying it is working in VLC first and look up the codec info in Tools -> Codec Info in VLC to make sure it is H264.
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Tonysal123		#6 Posted : Friday, September 11, 2015 5:44:37 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Is there a bit rate limitation on the incoming transport stream? We have a 35 Mb/s transport (H264/AAC) stream & vMix does not display the video. Can you also verify if vMix supports RTP. Thx, T
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admin		#7 Posted : Friday, September 11, 2015 6:58:31 PM(UTC)
Rank: Administration Groups: Administrators Joined: 1/13/2010(UTC) Posts: 5,210 Location: Gold Coast, Australia Was thanked: 4290 time(s) in 1520 post(s)		vMix does not support RTP, only Transport Stream or RTSP.
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Tonysal123		#8 Posted : Friday, September 11, 2015 6:59:52 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Update, by reducing the bit rate of the transport stream we able to decode the signal. The lowest bit rate we can do is 9 Mb/s and there is still a degraded picture- blocking/artifacts. Does the vMix rely on the video card GPU for the TS decoding? If so, would a better video card/GPU improve the performance? Also can the incoming transport stream have a color space of 4:2:2, currently we are using 4:2:0.
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ask		#9 Posted : Friday, September 11, 2015 8:51:32 PM(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/13/2012(UTC) Posts: 1,162 Location: Melbourne Thanks: 220 times Was thanked: 199 time(s) in 181 post(s)		Martin will be best placed to answer your questions above but the condition of your network has a lot to do with the issue, which your experiences has pinpointed. Your cabling/switches/routers may be the weak link and the larger amount of data is bottlenecking before it gets to vMIx. So sometimes reducing the bitrate improves the quality of the stream, even though intuitively you would expect that more data=better picture.
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Tonysal123		#10 Posted : Friday, September 11, 2015 9:00:01 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		It is a direct connection from the transport stream source to the vMix, no router/switches- just one cat6 cable.
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ask		#11 Posted : Friday, September 11, 2015 11:16:40 PM(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/13/2012(UTC) Posts: 1,162 Location: Melbourne Thanks: 220 times Was thanked: 199 time(s) in 181 post(s)		Have you also tried adjusting the incoming buffer size? From the help files: Buffer The network buffer in milliseconds can be configured to reduce jitter when receiving high latency network streams. For local network streams, this should be set between 0 and 500 milliseconds or 1000 to 5000 milliseconds for Internet streams.
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Tonysal123		#12 Posted : Friday, September 11, 2015 11:19:20 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Yep, tried adjusting buffer size- no change.
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ask		#13 Posted : Friday, September 11, 2015 11:48:29 PM(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/13/2012(UTC) Posts: 1,162 Location: Melbourne Thanks: 220 times Was thanked: 199 time(s) in 181 post(s)		Even 9 mb/s seems high. This from the YouTube guideleines: Live encoder settings, bitrates and resolutions 1080p Resolution: 1920x1080 Video Bitrate Range: 3,000 - 6,000 Kbps
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Tonysal123		#14 Posted : Friday, September 11, 2015 11:55:46 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		This is a contribution feed and should be of the best quality available, similar to the HD-SDI feed. It is not a streaming feed, it's a live studio feed from a cable network.
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ask		#15 Posted : Saturday, September 12, 2015 1:27:59 AM(UTC)
Rank: Advanced Member Groups: Registered Joined: 10/13/2012(UTC) Posts: 1,162 Location: Melbourne Thanks: 220 times Was thanked: 199 time(s) in 181 post(s)		OK. next look at the recieving PC as the bottleneck. Use VLC as the player and see what bitrate you can display using it. You might also like to do some comparison tests with other hardware
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Tonysal123		#16 Posted : Monday, September 14, 2015 4:21:56 PM(UTC)
Rank: Member Groups: Registered Joined: 9/5/2015(UTC) Posts: 10 Location: Los Angeles Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		I don't beleive VLC uses the video card' GPU functions, so it would not be a useful test comparison. BYW, VLC plays the 35Mb/s H.264 transport stream just fine.
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