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Multiple stream ffmpeg error
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Hi guys,
Have a problem with multiple stream. I have setup 3 stream with any bitrate, for ex. 1 stream 1280x720 - 3500kbit, 2 stream 1280x720 - 1500 kbit, 3 stream - 1280x720 - 200 kbit.
When I use just CPU is ok, but whe I enabler "Use hardware encoder" (I have a NVidia GTX970 card) I get a FFMPEG error. I try to disable one stream and after that works great. When enabled 3 stream - gat error again.
What the problem is? And how I can fix it?
P.S.
Why vMix use 32-bit FFMPEG???
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Joined: 8/2/2013(UTC) Posts: 1,072   Location: Fairhope, Alabama USA Thanks: 553 times
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Try using a lower resolution for the 3rd stream. 200k is quite slow for 720p. Try 360p or 240p at 200k. Does that make a difference?
- Tom
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This is happening because on a Nvidia card meant for gaming, you are allowed to use 2 hardware h.264 encodes at the same time maximum.
If you want to get over this limitation, you need a professional series card, like quadro.
If you need multibitrate streaming and without hardware encoder you don't have enough resources left encoding the 3 streams, you can also only send out a high quality stream to a service like zencoder, which will transcode it into multiple keyframe aligned streams with bandwidths of your choice.
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 2 users thanked Mathijs for this useful post.
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Rank: Member
Groups: Registered
Joined: 1/15/2016(UTC)
Posts: 14
Location: Prague
Thanks: 2 times
Was thanked: 1 time(s) in 1 post(s)
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Try using a lower resolution for the 3rd stream. 200k is quite slow for 720p. Try 360p or 240p at 200k. Does that make a difference?
No reaction. I try to stream 3500, 1500 and 500 kbit. I have disablem 3500 kbit, now is ok. But just 2 streams.
This is happening because on a Nvidia card meant for gaming, you are allowed to use 2 hardware h.264 encodes at the same time maximum.
If you want to get over this limitation, you need a professional series card, like quadro.
Thank you very much! I use Wowza with transcoder but now just vMix with Adobe Media Server witch has not transcoder. I'll know, thanks again!
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Rank: Member
Groups: Registered
Joined: 1/15/2016(UTC)
Posts: 14
Location: Prague
Thanks: 2 times
Was thanked: 1 time(s) in 1 post(s)
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Mathijs wrote:This is happening because on a Nvidia card meant for gaming, you are allowed to use 2 hardware h.264 encodes at the same time maximum.
If you want to get over this limitation, you need a professional series card, like quadro.
If you need multibitrate streaming and without hardware encoder you don't have enough resources left encoding the 3 streams, you can also only send out a high quality stream to a service like zencoder, which will transcode it into multiple keyframe aligned streams with bandwidths of your choice. Hi! Could you recommend which Quadro will ok for 3 streams (720p) ? Now I use 970GTX card for 2 streams and it loaded just 9% GPU on our server (i7 4790k).
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