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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. 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. It lets you quickly extract the good parts from your videos and discard many gigabytes of data without doing a slow re-encode and thereby losing quality. Or you can add a music or subtitle track to your video without needing to encode. Everything is extremely fast because it does an almost direct data copy, fueled by the awesome FFmpeg which does all the grunt work.

Features
Lossless cutting of most video and audio formats
Losslessly cut out parts of video/audio (for cutting away commercials etc.)
Losslessly rearrange the order of video/audio segments
Lossless merge/concatenation of arbitrary files (with identical codecs parameters, e.g. from the same camera)
Lossless stream editing: Combine arbitrary tracks from multiple files (ex. add music or subtitle track to a video file)
Losslessly extract all tracks from a file (extract video, audio, subtitle, attachments and other tracks from one file into separate files)
Batch view for fast multi-file workflow
Remux into any compatible output format
Take full-resolution snapshots from videos in JPEG/PNG format
Manual input of cutpoint times
Apply a per-file timecode offset (and auto load timecode from file)
Change rotation/orientation metadata in videos
View technical data about all streams
Timeline zoom and frame/keyframe jumping for accurate cutting around keyframes
Saves per project cut segments to project file
View FFmpeg last command log so you can modify and re-run recent commands on the command line
Undo/redo
Give labels to cut segments
View segment details, export/import cut segments as CSV
Import segments from: MP4/MKV chapters, Text file, YouTube, CSV, CUE, XML (DaVinci, Final Cut Pro)
Video thumbnails and audio waveform
Edit file metadata and per-stream metadata
Edit per-stream disposition
Cut with chapter marks
Annotate segments with tags
View subtitles

Example lossless use cases
Cut out commercials from a recorded TV show (and re-format from TS to MP4)
Remove audio tracks from a file
Extract music track from a video and cut it to your needs
Add music to a video (or replace existing audio track)
Combine audio and video tracks from separate recordings
Include an external subtitle into a video
Quickly change a H264/H265 MKV video to MOV or MP4 for playback on iPhone
Import a list of cut times from other tool as a EDL (edit decision list, CSV) and run these cuts with LosslessCut
Export a list of cut times as a CSV EDL and process these in another tool
Quickly cut a file by its MP4/MKV chapters
Quickly cut a YouTube video by its chapters (or music times from a comment)
Change the language of a file’s audio/subtitle tracks
Attach cover art to videos
Change author, title, GPS position, recording time of a video
Fix rotation of a video that has the wrong orientation flag set
Great for rotating phone videos that come out the wrong way without actually re-encoding the video.
Loop a video / audio clip X times quickly without re-encoding

LosslessCut 3.56.0 changelog:

Improvements and features
duplicate segment function
keyboard shortcuts search function #1646
DV Analyzer import #1664
allow user to reload current file on command #1674
customizable timestamp transfer #1017
extract multiple segments to images #1672
allow customizing per-stream bitstream filters #1680
reorganize settings screen
always show total frame count in timeline #1677
add webp to image capture formats #1671 (only works with html5)
if overwrite option is disabled, skip existing files #1655
add more output format categories #1539
ffmpeg v6 and newest electron

Fixes
fix track screen appearing behind export confirm #1540
fix “hide all notifications” bug #1541
fix timestamp issue and improve clicking variables
increase smart cut bitrate by 20% #126
Clarify mov faststart #1654
output file template improvements
notify about enable full waveform #260
seg num padding fixes #1446
don’t select segment when double clicking #1612
don’t auto-close dialog on timer if there are warnings #1658
add context menu to input fields #1217
many small fixes