The main feature is lossless trimming and cutting of video and audio files, which is great for saving space by rough-cutting your large video files taken from a video camera, GoPro, drone, etc. LosslessCut aims to be the ultimate cross platform ffmpeg GUI for extremely fast and lossless operations on video, audio, subtitle and other related media files. Also supports lossless cutting in the most common audio formats. This app uses the awesome ffmpeg for doing the grunt work. Also allows for taking JPEG snapshots of the video at the selected time. It doesn't do any decoding / encoding and is therefore extremely fast. Lets you quickly extract the good parts from your videos and discard GB of data without losing quality. Avidemux maybe the simplest solution for you.LosslessCut is great for rough processing of large video files taken from a video camera, GoPro, drone, etc. It can copy/remux from stream to stream without re-encoding. You can also quickly select the I-frame by select the next/prev key frame buttons (shortcut: Up/ Down) The frame type is displayed beside clip time, as you can see Frame type: I-FRM (00) in the below screenshot (although the actual format may be changed, for example Frame:I(02) in older versions) Just remember that you select Copy in the video output instead of any codecs, and the start marker must be at an I-frame
The reason is that a video file is split into group-of-pictures (GOPs) that are encoded independently of each other, and contain pictures/frames in the stream. So when you start with an I-frame, the whole GOP can be copied to the output file without re-encodingĮach GOP starts with an I-frame (A.K.A key frame) which is a full image without any interpolation, followed by B or P frames. However for the last GOP it might not work for some codecs if we don't copy the whole GOP (although I'm not quite certain of this).
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