eabebd1774
Lookahead requires examining frame data over a large number of frames, so when pkv added the change to fully reset the encoder when the bitrate changes, nvenc will invalidate all buffers and basically starts over from a completely clean slate. It's possible to make lookahead work when changing the bitrate, but due to how lookahead seems to works internally in nvenc, it will cause continually increasing latency every time the bitrate is updated, which is unideal. Additionally, when lookahead is enabled, deadlocks can occur when changing the bitrate in a thread other than the graphics thread. Currently we allow it to be reset outside of the graphics thread. From limited investigating, it would appear this deadlock occurs because nvenc is locking and releasing old textures. So instead of dealing with all these potential issues, disable the ability to adjust bitrate when the user has lookahead enabled on nvenc. It's not really worth implementing dynamic bitrate support when lookahead is enabled if the latency is just going to continually increase for every bitrate adjustment anyway.
OBS Studio <https://obsproject.com> =================================== .. image:: https://travis-ci.org/obsproject/obs-studio.svg?branch=master :alt: OBS Studio Build Status - Travis CI :target: https://travis-ci.org/obsproject/obs-studio .. image:: https://ci.appveyor.com/api/projects/status/github/obsproject/obs-studio?branch=master&svg=true :alt: OBS Studio Build Status - AppVeyor CI :target: https://ci.appveyor.com/project/jp9000/obs-studio/branch/master .. image:: https://dev.azure.com/obsjim/obsjim/_apis/build/status/obsproject.obs-studio?branchName=master :alt: OBS Studio Build Status - Azure Pipelines :target: https://dev.azure.com/obsjim/obsjim/_build/latest?definitionId=1&branchName=master .. image:: https://discordapp.com/api/guilds/348973006581923840/widget.png?style=shield :alt: OBS Studio Discord Server :target: https://obsproject.com/discord What is OBS Studio? ------------------- OBS Studio is software designed for capturing, compositing, encoding, recording, and streaming video content, efficiently. It's distributed under the GNU General Public License v2 (or any later version) - see the accompanying COPYING file for more details. Quick Links ----------- - Website: https://obsproject.com - Help/Documentation/Guides: https://github.com/obsproject/obs-studio/wiki - Forums: https://obsproject.com/forum/ - Build Instructions: https://github.com/obsproject/obs-studio/wiki/Install-Instructions - Developer/API Documentation: https://obsproject.com/docs - Donating/backing/sponsoring: https://obsproject.com/contribute - Bug Tracker: https://obsproject.com/mantis/ (Note: The bug tracker is linked to forum accounts. To use the bug tracker, log in to a forum account) Contributing ------------ - If you would like to help fund or sponsor the project, you can do so via `Patreon <https://www.patreon.com/obsproject>`_, `OpenCollective <https://opencollective.com/obsproject>`_, or `PayPal <https://www.paypal.me/obsproject>`_. See our `contribute page <https://obsproject.com/contribute>`_ for more information. - If you wish to contribute code to the project, please make sure to read the coding and commit guidelines: https://github.com/obsproject/obs-studio/blob/master/CONTRIBUTING.rst - Developer/API documentation can be found here: https://obsproject.com/docs - If you wish to contribute translations, do not submit pull requests. Instead, please use Crowdin. For more information read this thread: https://obsproject.com/forum/threads/how-to-contribute-translations-for-obs.16327/ - Other ways to contribute are by helping people out with support on our forums or in our community chat. Please limit support to topics you fully understand -- bad advice is worse than no advice. When it comes to something that you don't fully know or understand, please defer to the official help or official channels.