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hyperion-webos grabber for webOS.

This piece of software does high-framerate/low-latency capture of contents displayed directly on webOS TVs and transmits these frames to over the network.

Requires root.

Based on reverse-engineered internal system APIs. Still highly experimental.

If you are looking for a user-friendly UI that ships this piece of software check PicCap. This application mainly is the underlaying service for this software.

Known issues

  • Everything is based on highly platform-specific reverse-engineered internal system APIs. Standard no-warranty clauses apply.


This software uses multiple capture backends, that may work differently on some webOS versions/hardware platforms.

Now, with unicapture, video and ui backends are seperated and only blended together if desired.

This means, UI or video capture can be turned on/off individually.

Video capturing

Backend Description webOS
libdile_vt Low-level library used internally by libvt 3.x+
libvtcapture High-level video capture library 5.x+

UI capturing

Backend Description webOS
libgm UI capture library for older TVs 3.x+
libhalgal UI capture library for newer TVs 5.x+


Some TV models generally are comptabile with a specific backend, but require a slightly different routine to work reliably.

In this case, to not need totally different binaries, we implemented quirks, which can be toggled on if needed.

Currently the following ones exist:

Backend Quirk Description Flag
DILE_VT QUIRK_DILE_VT_CREATE_EX Use DILE_VT_CreateEx instead of DILE_VT_Create 0x1
DILE_VT QUIRK_DILE_VT_NO_FREEZE_CAPTURE Do not freeze frame before capturing (higher fps) 0x2
VTCAPTURE QUIRK_VTCAPTURE_FORCE_CAPTURE Use of a custom kernel module for reenable capture in special situation 0x100

They can be provided in config.json via the {"quirks": 0} field or on commandline via --quirks.

Easiest way though -> Use PicCap GUI!

You can assemble the final quirks value by using a bitwise-OR, e.g. quirks_value = (quirk_val | quirk_val2 | quirk_val3). The calculator is your friend ;)

You can find them defined here: Source code file


hyperion-webos together with * libraries need to be copied onto the TV, eg. into /tmp directory.

cd /tmp
./hyperion-webos --help
./hyperion-webos -b libdile_vt -a

Issues reporting

When reporting issues please include result of the following command:

grep -h -E '"(hardware_id|core_os_release|product_id|webos_manufacturing_version|board_type)"' /var/run/nyx/*

This contains model/hardware/region/software version, without any uniquely identifiable information.

If a segfault/crash occurs, a crashlog file will be generated in /var/log/reports/librdx or /tmp/faultmanager/crash/. This contains process memory dump and backtrace, but should not contain any uniquely identifiable information. (though, this is not guaranteed)

Code style / linting

To ensure a common codestyle on contributions, please ensure your submission is linted. The linting script depends on python3 / clang-format to be installed.

Run the linting / formatter script like this:

python lint/ --extensions "c,h,cpp" --color auto --recursive --inplace true ./src

To make a dry-run (and not auto-fix), omit the --inplace true parameter.