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To insert a clip/video from Resources window to the Timeline when Proxy is enabled (Active) you MUST Drag & Drop that clip/video from the Proxy folder instead of the Media folder, as well as for Nested clips. And also if you want to load the clip in the Viewer or Compositor. You can use clips in the Clips folder in any State of the Proxy - it does not matter if Proxy is enabled or disabled.
Rendered proxy media is saved in the same directory as the original media. As usual, you can delete proxy files from the project or disk in the Resources window if you no longer want to retain them. You should always save your project with the Proxy disabled.
If you create proxies for Nested clips they will be saved in $HOME/Videos unless you modify that in Settings → Preferences, Interface tab, Nested Proxy Path. If you change anything in a Nested clip using the Open EDL feature, you must first delete its old proxy file from disk because it is not updated automatically, and then enable Proxy again so that a new one is created.
Not all the settings for Proxy are saved in the project: the values of Active Scale and the Rescaled to project size are saved but not the File Format, File Type and all video compression data. A good idea is to record this information in a README file about your project where you make a note of your Proxy settings for that project. This is especially important because some Projects may use different Proxy settings and if you load a project where the Proxy is set and disabled, it could use a different setting because you changed the Proxy settings in a project you were working on before. If in that Project its proxy files were not deleted and you want to reuse them to save time, unfortunately they will be created again because the proxy settings have changed.
If the Creation of proxy on media loading option has been checked, then when you load other media later, proxies will be created for them automatically, or else you can change the Proxy's State from disabled to enabled (Active) using the Proxy icon. Previous proxy renders will be reused unless you change one of the following proxy parameters: Scale factor, File Format, or File Type. If proxies have been created and then you decide to change only the Compression type (Codec, Bitrate, Quality, Pixels), without changing the Scale factor or Container, you must delete proxy files from the disk beforehand. That is because CINELERRA-GG does not read the compression type; it does read the filename and if the filename does not change, CINELERRA-GG thinks the proxy was already created.
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