mp4 files with alpha channel

[slacker3007]

Expected behaviour

Expect the server to run without any issues for more than 24 hours.

Current behaviour

The server crashes after 12-14 hours and restarts.

If I use FLV or MOV files this issue doesn't appear after running for 72 hours.

Steps to reproduce

1. Have a project with mp4 files that have an alpha channel (file, file_A)
2. Runs scripts for your projects to execute the files, sometimes it's 10 different files running at the same time
3. After 12-14 hours error will appear with UNHANDLED EXCEPTION

Environment

• Commit: [e.g. ab1234c]
• Server version: casparcg-server-v2.3.3-lts-stable
• Operating system: Windows 10 Enterprise

---

[2023-05-14 14:21:07.872] [info] Sent message to 127.0.0.1:202 MIXER OK\r\n
[2023-05-14 14:21:27.103] [error] Exception: Throw location unknown (consider using BOOST_THROW_EXCEPTION)
[2023-05-14 14:21:27.103] [error] Dynamic exception type: class boost::exception_detail::clone_impl<struct boost::exception_detail::error_info_injector >
[2023-05-14 14:21:27.103] [error] std::exception::what: boost::thread_resource_error: Resource temporarily unavailable
[2023-05-14 14:21:27.103] [error]

[2023-05-14 14:21:27.103] [error]
[2023-05-14 14:21:27.109] [fatal] #######################
[2023-05-14 14:21:27.109] [fatal] UNHANDLED EXCEPTION:
[2023-05-14 14:21:27.109] [fatal] Adress:00007FFFDC18B693
[2023-05-14 14:21:27.109] [fatal] Code:3221225477
[2023-05-14 14:21:27.109] [fatal] Flag:0
[2023-05-14 14:21:27.109] [fatal] Info:0000006E291FA710
[2023-05-14 14:21:27.109] [fatal] Continuing execution.
[2023-05-14 14:21:27.109] [fatal] #######################
[2023-05-14 14:21:34.287] [info] ############################################################################
[2023-05-14 14:21:34.287] [info] CasparCG Server is distributed by the Swedish Broadcasting Corporation (SVT)
[2023-05-14 14:21:34.287] [info] under the GNU General Public License GPLv3 or higher.
[2023-05-14 14:21:34.287] [info] Please see LICENSE.TXT for details.
[2023-05-14 14:21:34.287] [info] http://www.casparcg.com/
[2023-05-14 14:21:34.287] [info] ############################################################################
[2023-05-14 14:21:34.287] [info] Starting CasparCG Video and Graphics Playout Server 2.3.2 4de6d18 Dev
[2023-05-14 14:21:34.650] [info] Initializing OpenGL Device.
[2023-05-14 14:21:34.651] [info] Initialized OpenGL 4.5.0 NVIDIA 527.27 NVIDIA Corporation