Premiere Pro automatically tries to compensate for the pixel aspect ratio of source files. You can also use assets created with different aspect ratios in the project. However, you can change the aspect ratio of a sequence. Once these ratios are set, you cannot change them for that project.
When a project is created in Premiere Pro, you set the frame and pixel aspect. For more information, see Frame aspect ratio. For example, you record video for television in either a 4:3 or 16:9 frame aspect ratio. The pixels that make up the frame have a pixel aspect ratio (sometimes referred to as PAR). Different video recording standards use different aspect ratios.
Add Responsive Design features to your graphics.Overview of the Essential Graphics panel.Automatically reframe video for different social media channels.Overview of video effects and transitions.Set up and use Head Mounted Display for immersive video in Premiere Pro.Measure audio using the Loudness Radar effect.Advanced Audio - Submixes, downmixing, and routing.Monitor clip volume and pan using Audio Clip Mixer.Editing, repairing and improving audio using Essential Sound panel.Synchronizing audio and video with Merge Clips.Edit from sequences loaded into the Source Monitor.Find, select, and group clips in a sequence.Importing XML project files from Final Cut Pro 7 and Final Cut Pro X.Importing AAF project files from Avid Media Composer.Setting up your system for HD, DV, or HDV capture.Use Premiere Pro in a dual-monitor setup.Best Practices: Create your own project templates.Open and edit Premiere Rush projects in Premiere Pro.Backward compatibility of Premiere Pro projects.GPU Accelerated Rendering & Hardware Encoding/Decoding.Hardware and operating system requirements.FAQ | New import and export in Premiere Pro (Beta).New import & export in Premiere Pro (Beta).