ustreamer: add package 6.50

[httpstorm]

📦 Package Details

Maintainer: @httpstorm

Description:
With mjpg-streamer pending removal [1], it would be nice if we add a compatible replacement which is under active development. ustreamer offers a better performance, especially when the camera supports MJPEG encoding in hardware.

Notable changes:
While the init.d script can run in the background when no camera is connected, it is more efficient to indicate no active instances. A hotplug script is introduced to start and stop the service when cameras are added or removed.

If the configured format or encoding are unsupported, a compatible alternative is automatically selected, so I changed the default configuration to use MJPEG encoding in hardware for better performance.

TODO:

• luci-app-mjpg-streamer which is also pending removal [2] is able to open the HTTP stream from ustreamer. It would be nice to create luci-app-ustreamer based on that first. Any volunteers?

• My experience with the OpenWRT make system is very basic, so please review the Makefile carefully.

• PKG_MAINTAINER is the ustreamer author from the original ./pkg/openwrt/Makefile, let me know if I need to change it to blank or add myself, but I don't have any development experience with the package.

• I copied the following line from mjpg-streamer, the build fails without it:

PKG_UNPACK=$(HOST_TAR) -C $(PKG_BUILD_DIR) --strip=2 -xf $(DL_DIR)/$(PKG_SOURCE)

• The package already includes OpenWRT support files ./pkg/openwrt, but they needed heavy editing, so it is more efficient to copy the scripts and configuration, instead of using patches. I can submit my changes upstream, but first I wanted to see if anyone would suggest changes. It might also be a good idea to keep our own scripts and configuration.

[1] #28344
[2] openwrt/luci#8221

@GeorgeSapkin @robimarko @hnyman @thess @roger- @systemcrash @jow- @mdevaev

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🧪 Run Testing Details

• OpenWrt Version: main r32847+5-bc8424ab89
• OpenWrt Target/Subtarget: mvebu/cortexa9
• OpenWrt Device: WRT3200ACM
• Camera tested: Logitech HD Pro Webcam C920 (UVC)
• CPU usage: < 1% for 1920x1080 MJPG hardware encoding

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✅ Formalities

• I have reviewed the CONTRIBUTING.md file for detailed contributing guidelines.

[httpstorm]

Ready. Anything else?

[mdevaev]

Hey. I'm just letting you know, that you you need some assistance from uStreamer side - I'm open to action and PRs.

In addition, I want to note that the number of options provided in config for init is limited, so if you want to add all the remaining ones, I don't mind.