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- image seq details (PNG, SVG) - normalize *.rst headers, for cleaner parsing - added performance page (real-time preview) - uninstall & clean-install steps - added menu options, views, and docks sections on main window - added preferences reset to default values - added to title page, include "text" word in title, added section on importing text from other programs. - various formatting and links
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.. Copyright (c) 2008-2023 OpenShot Studios, LLC | ||
(http://www.openshotstudios.com). This file is part of | ||
OpenShot Video Editor (http://www.openshot.org), an open-source project | ||
dedicated to delivering high quality video editing and animation solutions | ||
to the world. | ||
.. OpenShot Video Editor is free software: you can redistribute it and/or modify | ||
it under the terms of the GNU General Public License as published by | ||
the Free Software Foundation, either version 3 of the License, or | ||
(at your option) any later version. | ||
.. OpenShot Video Editor is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
GNU General Public License for more details. | ||
.. You should have received a copy of the GNU General Public License | ||
along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>. | ||
.. _performance_ref: | ||
|
||
Performance | ||
=========== | ||
|
||
The preview window is the area that the video will playback on the screen. The preview window utilizes a real-time | ||
video render from OpenShot Video Editor, including audio playback. This is the primary area for watching | ||
back your edits, giving you the feedback needed to make adjustments. | ||
|
||
Real-Time Preview | ||
----------------- | ||
|
||
Many factors affect how smoothly the **real-time preview** is rendered on your computer. This requires a fast, modern | ||
multi-threaded CPU, lots of RAM (memory), and a decent GPU. We have listed many of the important factors below. | ||
See :ref:`min_system_req_ref`. | ||
|
||
================== ============ | ||
Factor Description | ||
================== ============ | ||
CPU If your CPU is too slow or has too few cores, you will likely experience a slow, choppy preview. | ||
We recommend installing OpenShot on decent, modern computer. See :ref:`min_system_req_ref`. | ||
Memory If your available RAM memory is too limited, you will likely see huge drops in real-time | ||
performance, and your entire system will lag. We recommend installing additional RAM in your | ||
computer, if possible. | ||
Cache Your cache settings in the OpenShot Preferences are very important for determining how many | ||
frames to processes in advance. A value too low or too high can cause lag during the real-time | ||
video preview. The cache is also related to the available RAM. The higher the cache values, the more | ||
RAM and CPU is needed. We recommend experimenting with the Cache Preferences in OpenShot if you are | ||
experiencing issues with smooth playback. See :ref:`preferences_cache_ref`. | ||
Preview Size The height x width of your preview dock (widget) is very important for smooth real-time previews. | ||
The larger the window size, the more pixels must be rendered per frame, and the more CPU and RAM | ||
are required. It is recommended to keep reducing the preview window size until you achieve smooth | ||
video playback. On a slower computer, the preview window size might need to be very small for | ||
real-time previews (i.e. 320 x 240). | ||
FPS (Frame Rate) The FPS of your project is also very important, and a large factor for smooth video playback. For | ||
example, a 60 FPS video must render twice the number of frames, compared to a 30 FPS video. If | ||
you are experiencing slow downs in real-time performance, it can be helpful to reduce your project's | ||
FPS to a lower value, such as 30 or 24. | ||
Matching Rates It is very important to match your source assets FPS and Sample Rate with your Project FPS and Project | ||
sample rate. If either rate does not match exactly, it requires lots of additional CPU and RAM for | ||
OpenShot to normalize the mismatching rates. This can lead to audio pops, mis-alignments, duplicate frames, and extra | ||
lag in the real-time video preview. You can right-click a file and choose :guilabel:`File Properties`, to | ||
inspect the source asset rates, and ensure they match your Project settings (shown at the top of OpenShot). | ||
See :ref:`file_properties_ref`. | ||
Source Assets For example, if you are editing 4K 60 FPS source assets, this is likely going to put a strain on your system. A | ||
common solution is using another tool (such as FFmpeg) to create a copy (or proxy) of all your source assets, | ||
at a lower resolution (and maybe even a lower FPS). It is recommended to keep these proxy video files | ||
in their own folder, separate from the original video files. Once you have completed your video editing with | ||
the proxy files, simply copy/paste your `*.osp` project file back into the original folder, and export | ||
the higher quality, original files. | ||
================== ============ |
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