Decklink Mini Recorder PCIe not working 1080p30

Questions about ATEM Switchers, Camera Converter and everything live!
  • Author
  • Message
Offline

Smon222

  • Posts: 6
  • Joined: Tue Nov 17, 2020 12:27 am
  • Real Name: Stephen Montoto

Decklink Mini Recorder PCIe not working 1080p30

PostSat Jan 15, 2022 2:45 pm

Says on the box it supports 1080p30 but only receiving audio, no video.

Setting camera to 1080p24 and 1080i output work fine both audio and video.

Setup is: Sony A7s3 >> HDMI >> BM HDMI to SDI 3g micro >> SDI 3g cable >> Decklink Mini Recorder PCIe >> OBS studio

In the Desktop Video Software, I can select 1080p30 but doesn't matter. Do I need to return this for something else? I was hoping to use the PCIe x1 slot on my motherboard but its not the end of the world.

Any help would be greatly appreciated, thank you in advance!
Offline

ManchesterV

  • Posts: 283
  • Joined: Sun Mar 29, 2020 3:29 pm
  • Real Name: Gavin Gration

Re: Decklink Mini Recorder PCIe not working 1080p30

PostSat Jan 15, 2022 3:55 pm

Is the Sony sending true 30p or PsF (1080i wrapped 1080p)?

We don't have that camera but on our Sony FS cameras we can determine what gets sent via the video outputs as either 1080i or 1080p independent of the record settings.
Offline

Smon222

  • Posts: 6
  • Joined: Tue Nov 17, 2020 12:27 am
  • Real Name: Stephen Montoto

Re: Decklink Mini Recorder PCIe not working 1080p30

PostSat Jan 15, 2022 5:20 pm

ManchesterV wrote:Is the Sony sending true 30p or PsF (1080i wrapped 1080p)?

We don't have that camera but on our Sony FS cameras we can determine what gets sent via the video outputs as either 1080i or 1080p independent of the record settings.


Hey! We do have the same 1080i/1080p output settings and I have it set at 1080p for HDMI. We tried it on our FX3 and same. It does work 1080i though.

Do you have yours working at 1080p30?
Offline

Dave Del Vecchio

  • Posts: 1603
  • Joined: Mon Nov 25, 2013 10:25 am

Re: Decklink Mini Recorder PCIe not working 1080p30

PostMon Jan 17, 2022 12:20 pm

The Sony A7S III and FX3 (and most of the Sony Alpha cameras for that matter) do not actually output 1080p30 over HDMI when set to record at that resolution internally. Instead when set to 1080p HDMI output and 1080p30 internal recording, the camera will output 1080p60 (or technically 1080p5994) over its HDMI output.

This is a problem when using these cameras with the DeckLink Mini Recorder or the original, non-3G version of the UltraStudio Mini Recorder as these devices cannot handle 1080p60 input resolutions. They can only handle progressive resolutions up to 1080p30 or interlaced resolutions up to 1080i60. You would need something like the DeckLink Mini Recorder 4K or UltraStudio Mini Recorder 3G or better in order to handle 1080p60 input.

Alternatively, if you set the camera to record internally at 1080p30 and output 1080i60 over HDMI, with proper de-interlacing to combine the two fields for each frame, you should be able to convert the 1080i60 back into clean 1080p30.

This situation of outputting 1080p60 when recording 1080p30 internally is not unique to Sony cameras, but also affects a variety of consumer-oriented cameras from Canon and other manufacturers as well. I believe the reason for this behavior is that 1080p30 (or 1080p2997) was never a broadcast standard for HD video (like 1080i and 720p were), and as a result, many monitors and TVs do not support this as an input resolution. In contrast, 1080p50, 1080p60 as well as 1080p24 are all included formats in the AVCHD 2.0 video standards, which meant that these video formats are supported by a lot of Blu-Ray and other media players and enjoy better compatibility among HDMI monitors and TVs.

This is why some of these cameras are capable of outputting 1080p24 (or 1080p23.98) over HDMI as that is a popular video format for movies, but they do not do the same for 1080p30.
Offline

Smon222

  • Posts: 6
  • Joined: Tue Nov 17, 2020 12:27 am
  • Real Name: Stephen Montoto

Re: Decklink Mini Recorder PCIe not working 1080p30

PostMon Jan 17, 2022 1:53 pm

Dave Del Vecchio wrote:The Sony A7S III and FX3 (and most of the Sony Alpha cameras for that matter) do not actually output 1080p30 over HDMI when set to record at that resolution internally. Instead when set to 1080p HDMI output and 1080p30 internal recording, the camera will output 1080p60 (or technically 1080p5994) over its HDMI output.

This is a problem when using these cameras with the DeckLink Mini Recorder or the original, non-3G version of the UltraStudio Mini Recorder as these devices cannot handle 1080p60 input resolutions. They can only handle progressive resolutions up to 1080p30 or interlaced resolutions up to 1080i60. You would need something like the DeckLink Mini Recorder 4K or UltraStudio Mini Recorder 3G or better in order to handle 1080p60 input.

Alternatively, if you set the camera to record internally at 1080p30 and output 1080i60 over HDMI, with proper de-interlacing to combine the two fields for each frame, you should be able to convert the 1080i60 back into clean 1080p30.

This situation of outputting 1080p60 when recording 1080p30 internally is not unique to Sony cameras, but also affects a variety of consumer-oriented cameras from Canon and other manufacturers as well. I believe the reason for this behavior is that 1080p30 (or 1080p2997) was never a broadcast standard for HD video (like 1080i and 720p were), and as a result, many monitors and TVs do not support this as an input resolution. In contrast, 1080p50, 1080p60 as well as 1080p24 are all included formats in the AVCHD 2.0 video standards, which meant that these video formats are supported by a lot of Blu-Ray and other media players and enjoy better compatibility among HDMI monitors and TVs.

This is why some of these cameras are capable of outputting 1080p24 (or 1080p23.98) over HDMI as that is a popular video format for movies, but they do not do the same for 1080p30.


Thank you truly for a detailed answer, after hours of searching and scratching my head. I use OBS a lot and just built this dedicated pc to output 1080p30 like the laptop setup I have been using and Camlink4k usb.

I really liked the cards since they only take a x1 slot and looked like they would work perfect. Does OBS have a clean way to deinterlace 60i to 30p? This is getting a bit more technical now and I don't want to screw up the stable streaming I have been doing for this companies seminars.

Thank you so much!
Offline

ManchesterV

  • Posts: 283
  • Joined: Sun Mar 29, 2020 3:29 pm
  • Real Name: Gavin Gration

Re: Decklink Mini Recorder PCIe not working 1080p30

PostMon Jan 17, 2022 3:51 pm

Intensity Pro 4K here rather than a Decklink Mini. 25P and 29.97P both work fine at 1080p with an FS700 set to 1080P recording mode and HDMI output mode also set to 1080P for the respective frame rate.

In OBS set your project in Settings/Video to 1080 29.97
Set the BMD Device capture to 1080i59.94
Right click on the screen showing the camera image and set deinterlacing to 'disable'.

That should result in a 29.97 feed.

Stream at 30P - your encoder NVENC etc should make the 29.97 to 30P conversion pretty well. You can, if you prefer set the OBS project to 30P - this might be preferable if you're bringing in other assets that are true 30P such as computer feeds. The end result will be similar.

Return to Live Production

Who is online

Users browsing this forum: No registered users and 45 guests