December 17, 2019

Running encoders in out-of-process mode

Live Transcoder for Nimble Streamer allows using a number of encoder libraries for producing output stream content. All encoding activities are performed in the same process with the other transcoding pipes.

However, there are cases when encoder libraries may cause issues. Some experimental encoders may be unstable during extensive usage and even legacy encoders in some cases may act unpredictably - that is because the encoding process is very complicated. These issues may cause the main Nimble Streamer process to go down and stop processing streams. This affects overall robustness and stability of streaming infrastructure.

To address that, we've made Live Transcoder to support running encoders in out-of-process mode. It makes Nimble Streamer to start a new separate process for each encoder in transcoder scenario. If the encoder fails, the process is stopped and automatically re-started without affecting overall transcoding. The output is also not interrupted so your end-users will notice just a short image freeze.

By default, out-of-process encoding is enabled only if you choose SVT-HEVC encoding library for specific encoder. For all other encoders, this capability is disabled by default.

To enable this feature, you need to open encoder details dialog, enter new nimble-execution-mode parameter on the left and then enter its out-of-process value to the right as shown on the image below.

Once you save the transcoding scenario and it's synced to Nimble Streamer instance (which happens 30 seconds), this will take immediate effect.

Out-of-process encoding is available in Nimble Streamer starting from version 3.6.3-2 and Live Transcoder starting from version 1.1.1-2.

This improvement brings ability to have more robust and reliable transcoding. Let us know if you have any questions regarding this feature usage.

Related documentation

Live Transcoder, Transcoder documentation reference

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