Record with OBS Studio
Updates: 2025-11-04
The biggest challenge when recording from an Android TV Box (video streaming hardware) is to record video and surround sound in sync. I tried several ways of doing this and found one which allows me to do it in one recording without too expensive hardware. I have not found a video capture card on the market which allows to record a protected video stream or multi-channel surround sound.
Note: This guide is not intended to teach you how to circumvent copy protection. Make sure the source or service you are recording from allows you to make a copy for your own use before you record. Creating multiple copies or selling copies is prohibited by law.
Settings
Gear
-
AV Device:
OPPO UDP-203 4K Ultra HD Bluray Disc Player (player with HDMI passthrough and analog surround 7.1 audio outputs)
-
Video Capture:
Blackmagic Intensity Pro 4K PCI-e capture card
USB Audio:
ESI U86XT USB audio interface
-
-
Monitor or TV
With this setup you can record video and 5.1 or 7.1 audio at the same time.
Cost of gear
Media Player: 100 USD
AV Device: 1000 USD (you need to find a premium player or another device with HDMI passthrough and analog surround audio outputs). Instead of a Disc Player you can utilitze any 5.1 (Pre-)Amplifier which supports an audio codec currently used by Netflix, Disney+, Amazon Prime, HBO Go, etc. If you use a pre-amplifier with variable output volume make sure you adjust the volume so you don't need to post-process amplification to it. Note that not every 5.1 pre-amplifier works, only one which supports the audio codec in the source stream.
Video Capture: 300 USD
Multi-channel USB audio interface: 300 USD (with 6 or 8 analog inputs). If you don't have one or do not want to buy one you can record the 6 channels in 3 stereo pairs and then sync the audio with Audacity. 3 stereo pairs means you need to record the stream 3 times, each time you connect a different pair of analog output to the analog stereo input of the Video Capture card (e.g. L/R, C/LFE, SL/SR).
8K HDMI cables (3x): 100 USD
Ground Loop Isolators: 30 USD (for 6 channels)
Splitter: 30 USD
Computer Monitor or TV
TV: existing
PC: existing
TOTAL: 1850 USD
Notes on the Splitter
I purchased 3 splitters, only one of them works
Check that the splitter is EDID compatible
You need to make sure the HDMI master output of the splitter is connected to the AV Device and not to the TV, otherwise the Media Player apps see a device with 2 channels only. My splitter has a switch to set either of the HDMI outputs as master.
Connection diagram
flowchart LR;
Isolator["Ground
Isolator"];
Capture["Video
Capture"];
USBaudio["USB Audio"];
Box["Media Player"];
Box--HDMI-->Splitter;
Splitter--HDMI-->TV
Splitter--HDMI-->BDP["AV Device"];
BDP--"FL/FR
C/SW
SL/SR
(6ch RCA)"-->Isolator;
BDP--HDMI-->Capture;
Capture--"PCI-e
or
USB"-->PC;
Isolator--"FL/FR
C/SW
SL/SR
(6ch RCA)"-->USBaudio;
USBaudio--USB-->PC;
click PC "#software"
Notes:
The UDP needs to be set to Source Direct to pass through the video to the capture card, and the input needs to be set to HDMI In.
While Netflix has a desktop client from which you could separately record 5.1 audio, other streaming clients on Windows do not have this feature.
Steps
Switch on Media Player
Switch on Disc Player
Set Disc Player to HDMI in with remote or handheld app
Start OBS
Software
Desktop Audio 5.1
Video: none
Audio: Windows 10 App
FHD Surround 5.1 (Intensity Pro)
Video: Mi Box S → 40281 (HDMI) → Intensity Pro (HDMI)
Audio: Mi Box S → 40281 (SPDIF) → AVR-4308 (5.1 through Pre Out) to U86XT (Line IN 1-6)
Make sure you connect the U86XT through a Ground Loop Isolator to the AVR to avoid ground loop issues while recording
Set the AVR-4308 to volume -10 dB
VHS Stereo (Intensity Pro)
Video: HR-S6711EU (composite) → Intensity Pro (Y - green)
Audio: HR-S6711EU (stereo) → Intensity Pro (RCA)
Audio monitor: HR-S6711EU (stereo) → AVR-4308
OBS Studio
Settings
Properties Intensity Pro 4K
Properties ESI U86 XT
Device: U86 Multichannel 8 (ESI Audio Device (WDM) - U86)
Advanced Audio Properties - Sync Offset: -120ms
Advanced Audio Properties - Tracks: 1
Filters
Deinterlacing
Subtitles
Player Apps
In general, I recommend to set the Android TV Box to Do not auto-update apps in Google Play Store. I will explain below in the app sections.
Max
The Max app does not run smoothly on Xiaomi Mi Box S, but does so on Mecool KM9 Pro
Install app version 5.11.0. This app version remembers your choice of displaying the full end credits without popping up choices of other movies, app version 5.12.0 (and probably later versions) do not remember your choice. I assume this was a bug in version 5.11.0 and I did not check whether older versions show the same behavior.
How to handle the end credits:
When the end credits start the app will display a choice of other movies
Press OK on the remote to bring back the end credits screen
Press LEFT to go back to a marker position in the movie before the display of choice of other movies shows up, then BACK to remove the status bar at the bottom
This time the end credits show through without display of choice of other movies
Use
HandBrakeCLI to cut 2 parts of the movie including audio
Amazon Prime
If you change the video resolution in your video chain (Media Player, AV Device) you need to delete the cache and re-start previously started movies, not resume, to get the resolution fixed.
How Tos