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Recording 3 raw HDV streams while outputting to external device
Rank: Member
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Joined: 10/5/2010(UTC)
Posts: 21
Location: Netherlands
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Hi there,
I'm trying to achieve the following:
I want to connect 3 HDV camera's to my PC through firewire and get them in Vmix. Then I want to be able to switch between the camera's in Vmix and output the result to an external device. So far so good, right? But I also want to record the 3 raw HDV streams from the camera's to the PC's hard disk (for editing at a later time), at the same time.
Is this possible in Vmix, and if not, will it be in the future?
Thanks!
Albrecht
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Rank: Administration
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Joined: 1/13/2010(UTC) Posts: 5,207  Location: Gold Coast, Australia Was thanked: 4284 time(s) in 1519 post(s)
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Recording multiple streams is not supported at this time.
Current computer hardware is only able to reliably record a single stream and this is the focus of vMix.
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 1 user thanked admin for this useful post.
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Rank: Member
Groups: Registered
Joined: 10/5/2010(UTC)
Posts: 21
Location: Netherlands
Thanks: 5 times
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Thanks for the answer!
Albrecht
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Rank: Member
Groups: Registered
Joined: 10/5/2010(UTC)
Posts: 21
Location: Netherlands
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Hi again,
@admin: I'm reading your answer again today and I think I might not have been clear enough about what I'm trying to accomplish.
I'm trying to record the HDV-streams from the camera's while they're still 25Mbit. So before they are decompressed for Directshow-purposes. Recording from three camera's would only take up 75Mbit (9,375 MB), which should not be a problem at all for current computer hardware.
This is a function I would really appreciate in Vmix!
Do you think this might be possible in a future Vmix-release?
Thanks!
Albrecht
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Rank: Administration
Groups: Administrators
Joined: 1/13/2010(UTC) Posts: 5,207 Location: Gold Coast, Australia Was thanked: 4284 time(s) in 1519 post(s)
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If you test by opening three separate capture programs and start recording from three HDV cameras, depending on the hardware it will still drop frames every now and then. This is particularly disastrous for HDV as a single frame can lead to an entire MPEG GOP sequence being discarded (up to 15 frames).
Put this alongside vMix having to decode three MPEG-2 streams simultaneously while saving them to disk and you will get a generally unreliable experience.
This is why uncompressed sources (HDMI etc) are the focus of vMix as a consistently reliable single stream setup is possible.
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Rank: Guest
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i tested some options to record multiple video files simultaneously and i can affirm that my little i7 920 can record, my little 3gb DDR3, and my little geforce 9600gt can record without problems that uncompressed sources at 25mb each one. I just have to use 1 hdd for each video file. no problems at once.
i just tell my experience with my tests, worked well with 2 hdv sources, only one pc and 1 usb hdd, not ssd, per video file. no drops, no fails, everything worked fine. I had to use separate programs to capture hdv sources, thus increasing the processor utilization.
now, imagine that using only one software.
regards (really hope that you martin can implement that feature in vmix, I understand your fear but the final result is not so bad)
melody
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