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SysDVR - Stream gameplay directly to a pc

SysDVR
Stream/record gameplay to a PC via USB or network.
upload_2019-10-21_9-21-20.png
​

Update: Version 5.0 has been released with low latency streaming, be sure to check it out on github.

This is an experimental sysmodule that allows capturing the running game output on a pc.
As this uses switch's built-in game recording feature it has the same limitations: 720p@30fps and only works on the games that enable it, but by sending the video to another device there's no time limit to the recording.

There are two modes: USB and Network, both work fine but USB is slightly better, at least compared to wifi, didn't try with a LAN adapter.
Players like mpv or vlc can play the stream directly so you can use any screen recording applications but it's also possible to write the stream directly to a file.
To use the USB version you need the UsbStream program you'll find on the github page, it's built using .NET 5 and works on both windows and linux, haven't tried mac but in theory it should work too.

You can see it in action in the two teasers i posted while working on it:



As you can see it's not meant for remote play, but it can work as a basic capture card, audio output is uncompressed so it can be useful for ripping OSTs .

Download and wall of text guide on github: https://github.com/exelix11/SysDVR/
To get notified of updates you can follow this thread or join my new discord server (i also have a twitter account where occasionally post development updates).
Please make sure to read the full readme before reporting issues as it explains the most common problems you may encounter.
 
Last edited by exelix11,
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M7L7NK7

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Unity150_magickavoxel said:
Was playing as normal then this happened

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Fatal error. Internal CLR error. (0x80131506)
at System.Enum.GetEnumInfo(System.RuntimeType, Boolean) at LibUsbDotNet.NativeMethods.BulkTransfer(LibUsbDotNet.DeviceHandle, Byte, Byte*, Int32, Int32 ByRef, UInt32)

at LibUsbDotNet.NativeMethods.UnrefDevice(IntPtr)
at LibUsbDotNet.NativeMethods.BulkTransfer(LibUsbDotNet.DeviceHandle, Byte, Byte*, Int32, Int32 ByRef, UInt32)
at LibUsbDotNet.NativeMethods.UnrefDevice(IntPtr)
at LibUsbDotNet.LibUsb.UsbEndpointBase.Transfer(IntPtr, Int32, Int32, Int32, Int32 ByRef)
at LibUsbDotNet.Device.ReleaseHandle()
at LibUsbDotNet.LibUsb.UsbEndpointBase.Transfer(System.Object, Int32, Int32, Int32, Int32 ByRef)
at System.Runtime.InteropServices.SafeHandle.InternalRelease(Boolean)
at UsbStream.UsbDevStream.Read(Byte[], Int32, Int32)
at System.Runtime.InteropServices.SafeHandle.Dispose(Boolean)
at System.IO.Stream.Read(System.Span`1<Byte>)
at System.Runtime.InteropServices.SafeHandle.Finalize()
at UsbStream.Program.<StreamLoop>g__ReadToSharedArray|14_1(<>c__DisplayClass14_0 ByRef)
at UsbStream.Program.StreamLoop(IOutTarget, UsbStream.UsbDevStream, StreamKind)
at UsbStream.Program+<>c__DisplayClass16_0.<Main>b__2()
at System.Threading.ThreadHelper.ThreadStart_Context(System.Object)
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Threading.ThreadHelper.ThreadStart()
Click to expand...

That's what I get after a few seconds or before it even starts streaming
 
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exelix11

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HarvinMalig said:
how to use network stream? the mpv.exe close when i put the bat file (mpv.exe tcp://%my switch ip%:6666 --no-correct-pts --fps=30) also the command promp mpv autoclose upon opening thus cant be used, im using sx os and put the titles on sxos folder/titles
Click to expand...
Not sure if you can use this on sxos, last time i checked it doesn't support custom sysmodules. Anyway you should use mpv.com and not the exe on windows.

SebTheThing said:
Nope, doesn't feel like this is working. I just tried it out, and as the .264 file is already slowed down, converting it and changing the framerates does not change anything, it just outputs a slowed down file with a higher framerate :/ I don't really know what to do here, kinda stuck
Click to expand...
I feel like you just duplicated the frames to match the required framerate, there should be an option to interpret the file as 30fps thus increasing the speed

Unity150_magickavoxel said:
Was playing as normal then this happened

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Fatal error. Internal CLR error. (0x80131506)
at System.Enum.GetEnumInfo(System.RuntimeType, Boolean) at LibUsbDotNet.NativeMethods.BulkTransfer(LibUsbDotNet.DeviceHandle, Byte, Byte*, Int32, Int32 ByRef, UInt32)

at LibUsbDotNet.NativeMethods.UnrefDevice(IntPtr)
at LibUsbDotNet.NativeMethods.BulkTransfer(LibUsbDotNet.DeviceHandle, Byte, Byte*, Int32, Int32 ByRef, UInt32)
at LibUsbDotNet.NativeMethods.UnrefDevice(IntPtr)
at LibUsbDotNet.LibUsb.UsbEndpointBase.Transfer(IntPtr, Int32, Int32, Int32, Int32 ByRef)
at LibUsbDotNet.Device.ReleaseHandle()
at LibUsbDotNet.LibUsb.UsbEndpointBase.Transfer(System.Object, Int32, Int32, Int32, Int32 ByRef)
at System.Runtime.InteropServices.SafeHandle.InternalRelease(Boolean)
at UsbStream.UsbDevStream.Read(Byte[], Int32, Int32)
at System.Runtime.InteropServices.SafeHandle.Dispose(Boolean)
at System.IO.Stream.Read(System.Span`1<Byte>)
at System.Runtime.InteropServices.SafeHandle.Finalize()
at UsbStream.Program.<StreamLoop>g__ReadToSharedArray|14_1(<>c__DisplayClass14_0 ByRef)
at UsbStream.Program.StreamLoop(IOutTarget, UsbStream.UsbDevStream, StreamKind)
at UsbStream.Program+<>c__DisplayClass16_0.<Main>b__2()
at System.Threading.ThreadHelper.ThreadStart_Context(System.Object)
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Threading.ThreadHelper.ThreadStart()
Click to expand...
Other users have been reporting that, there's an open issur on github and I'm looking into it. After around 10 minutes the stream via usb fails

ctrninja said:
this software loves to lock up my switch.
Click to expand...
Other sysmodules that use too much memory or the usb port like sysftpd and mtp server cannot run at the same time.

Milenko said:
That's what I get after a few seconds or before it even starts streaming
Click to expand...
Really not sure about this, windows version? 32bit or 64 ? Try disabling all other sysmodules and biot with just this one but i think there's something going on with your pc
 
HarvinMalig

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i used the com but auto closes upon opening, i read about it sxos supports customsysmodules

edit: upon searching and asking, no sxos does not support customsysmodule and that is the problem
 
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hippy dave

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DiscostewSM said:
Was going to try it, but adding it locked up my Switch at the boot logo. The only other system module that was active was for FTP access, which I generally like to keep active because I used it often.
Click to expand...
Unfortunately sys-ftpd (which is awesome) takes up loads of memory, so it won't work alongside various other complex sysmodules.
 
SebTheThing

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exelix11 said:
I feel like you just duplicated the frames to match the required framerate, there should be an option to interpret the file as 30fps thus increasing the speed
Click to expand...

Yes! You were right. I specified the fps and the output file is all perfect. So for those running into this problem, this is the command I used with ffmpeg to get the correct speed on the ouput file:

ffmpeg -r 30 -i [input file] -vcodec copy [output file]

Thanks a lot for your hard work! :)
 
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Chrisssj2

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It is said. game must support this? Generally how many games do support this on the switch of the entire library..? 50%? less then 20%? more then 50%?
 
exelix11

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Chrisssj2 said:
Hmm okay.
I have bought an elgato HD 60 S. Since I thought this was never coming...

Now doubting if I should keep or sell it.
Click to expand...
If you intend on live streaming or recording hassle free or in higher quality that is better, This is limited to 720p@30fps + software caveats (eg unsupported games).
For just casual recording this is enough, guess as now you have a proper capture card just use that ¯\_(ツ)_/¯

Phenj said:
Does OC help with the performance? Using USB setup here.
Also, why does CHROME make my stream lag?
Click to expand...
From what i've heard it does, depends on games and may not be a big difference but it does improve.
About chrome idk use firefox guess could depend on its gpu usage, your pc may be not powerful enough to process all the data
 
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JonJaded

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Do you think you can concatenate the network and usb sysmodules into one and instead have an NRO that interacts with the sysmodule to change the mode?
 
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exelix11 said:
If you intend on live streaming or recording hassle free or in higher quality that is better, This is limited to 720p@30fps + software caveats (eg unsupported games).
For just casual recording this is enough, guess as now you have a proper capture card just use that ¯\_(ツ)_/¯


From what i've heard it does, depends on games and may not be a big difference but it does improve.
About chrome idk use firefox guess could depend on its gpu usage, your pc may be not powerful enough to process all the data
Click to expand...
I've got a good pc so i don't think that's the problem, maybe it is just chrome. Edge works fine lol.
 

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