Video is a visual multimedia source. It basically a series of frames that contains data related to displaying these visual content over time. PS2PDF support compressing of MP4 with H.264 and H.265 and WebM with VP8 and VP9. The main factor in compression is called the Constant Rate Factor. Constant Rate Factor or CRF is a rate control (quality/file size) for VP8/VP9 and H.264/H.264. Lower values of CRF produce large file sizes but has higher quality. This is where PS2PDF's Presets comes in handy, you can set the preset to a slower one to compress large high-quality outputs.
PS2PDF Video compressor allows you to compress MP4 and WebM files without a limit. It is the fastest online free video compressor on the web. You can compress a video (.mp4 and .webm) by setting Constant Rate Factor (a General Option) to ~20 and Preset to medium to get an amazing quality compressed video.
Another way to compress Video files is to resize them to a smaller size. You can use the Resize dropdown on Output Dimension section to select a Preset Resolotions such as 8k, 4K, 1080p, 720p, 480p, 360p, 240p, and other non-standard options to reduce video width and height.
Or you can set Video width and height relatively or independently. Setting relative is preferred if you want to keep the aspect ratio intact.
Most videos you take from iPhones and Androids converted to .MP4 format or .WEMB. These formats can be open using VLC Player . In fact, VLC can open almost any video format and support Linux and MacOS platforms.
The default option is to install VLC player. On Ubuntu (Debian) you can run sudo apt-get install vlc. Make sure you have X11 installed.
Quick Time cannot open .mp4 and .webm files. You will need to install VLC player to be able to view MP4 and WebM video on MacOS.