Software » Video Editors » LosslessCut 3.70.1

3.70.1

(Windows) Fix FFmpeg missing from the x64 build #3147
See 3.70.0 for the full list of changes.

3.70.0

Upgrade bundled FFmpeg to 8.1 (fixes CVE-2026-8461) #2943 #3139
New "Theme" setting (System default / Dark / Light) - LosslessCut can now follow the OS dark/light theme #3113
Metadata editor improvements #3135 #3136 #3140 #3141
Copy track or file metadata from another track or another loaded file with the new "Copy from" menu
Apply a track metadata value (e.g. language) to all other tracks of the same type with one click
Edited tracks and files are now highlighted in the tracks dialog, and changes can be reset per track, per file or all at once
Suggestions for common codec tags (e.g. hvc1 for Apple compatibility), language codes and metadata keys (title, language, handler_name), with warnings for invalid values
"Now" button for creation_time, multi-line editing for comment/description, Esc to cancel an edit, and a notice when MP4/MOV may drop custom keys
Export dialog warns when an HEVC track will lack the hvc1 tag needed for Apple devices
New setting "Video preview scaling" (advanced), e.g. to not upscale small videos #3125 #3134 (based on #3132 by @mangod12)
The Change FPS dialog now accepts fractions like 30000/1001 #2492
Register .llc project files, so they can be double-clicked to open in LosslessCut (Windows, macOS) #3070
(Linux) LosslessCut can now be chosen as "Open with" app for video and audio files (AppImage, snap) #288
(Linux) AppImage no longer requires libfuse2 #3022
Press Escape to leave an input field (or Enter to commit a cut time), so that keyboard shortcuts work again #2942
Inserting a variable or resetting the output file name template can now be undone #3017
Ctrl+Q now quits LosslessCut on Windows and Linux #2136
Trackpad pinch zooms the timeline faster, and Shift now works as the mouse wheel zoom modifier #3118
Show a subtle timeline progress indicator in fullscreen
Bring back the time display when hovering the timeline
Track import, subtitle and project import dialogs now open in the folder of the current video #3088 #3019 (thanks @Doomguy-BFG9000 #3096)
Show sample rate (kHz) instead of frame rate for audio tracks in the tracks dialog #3099
Improve contrast of the timeline cursor and keyframes on top of segments #1199
Add GitHub link in the Help menu #2950
Pull latest translations
Bug fixes:

Compensate for FFmpeg seeking too early in MKV/WebM files with B-frames, which made keyframe cuts start from the previous keyframe (tested on synthetic files, feedback welcome) #1216 #2804 #3131 (thanks to #1984 for the investigation)
Fix audio-only (e.g. M4A) cuts starting several seconds early/late for files that only flag some audio packets as keyframes #3087
Fix wrong duration of exported segments when cutting a file with cover art (e.g. split M4A audiobooks) #3009
Fix playback and "convert to supported format" of audio with unknown/non-standard channel layouts (e.g. DV/DVCPRO .mov) #3038
Fix black/silent scene detection finding nothing with FFmpeg 8.1
Fix audio continuing to play after closing a file #2907
Fix file modification time of smart cut output (it was up to one keyframe interval off) #3116, and of fully re-encoded segments (lossy mode) #3067 (thanks @mklaber #3068)
Fix export failing when a segment label contains characters that are invalid in file names (e.g. :) and "Sanitize file names" is off #2986 #3121, or control characters on Windows #3123
Fix file name sanitizer not replacing / and some punctuation #2982 (thanks @chrisrode #2983)
Long output file names no longer lose their file extension when truncated, exporting segments from files with very long names no longer produces duplicate names, and long non-Latin names are truncated correctly #2171 #3114 #3115
Fix chapters having zero length, or missing when an input chapter has no title, when merging files that already have chapters #3124
The merge compatibility check no longer warns about small differences in average frame rate #2759
When the custom merge output file name template is invalid, the fallback name no longer says "cut-merged" #3115
Fix typed cut times being lost when using frame or seconds timecode formats #2969 #3129; cut time inputs now keep the typed time when clicking elsewhere (Escape still cancels) #3133
Fix importing Final Cut Pro / DaVinci Resolve XML files with only one clip or whole second times #3127
Fix mouse wheel zoom direction (wheel up / pinch out zooms in again) #2962, and mouse wheel seeking sometimes stepping backwards #3118
OS media keys no longer interfere with playback, and no empty media control is shown in the OS #3028
The "hevc_mp4toannexb" track option toggle now correctly shows whether it is enabled #3135
(Linux snap) Fix crash on startup #3002 #3026
(Windows) Show a proper "FFmpeg executable not found" error instead of an error report when the (custom) FFmpeg executable is missing #2993
Show a clear error when the source file was moved/deleted before extracting frames or tracks #3023
Fix digits being laid out vertically instead of horizontally (regression in 3.69.0) #2911
Simple mode: improvements, and no longer overwrite the merged files name template #2927
Other notable changes:

"Create segments from keyframes" moved from the Tools menu to the Segments menu #3074 (thanks @ArianMoeini #3092)
"Remove selected segments" moved to the bottom of the segments context menu, to avoid accidental clicks
HTTP API: requests coming from a web browser (with an Origin header or a non-localhost Host header) are now rejected, to prevent websites from controlling LosslessCut. See API docs
CLI: relative file paths are now resolved correctly when LosslessCut is already running #1571 #3104 (based on a patch by Bell)
CLI: --keyboard-action arguments now accept JSON5 and are validated, and no longer try to open their arguments as files when no instance is running #3108; --settings-json is now validated and invalid input is ignored instead of being written to the config #3106
Security hardening: disable the RunAsNode and other unneeded Electron fuses #3059
Upgrade Electron to 42.11.15 (security fixes), and fix the tar decompression DoS vulnerability in build dependencies
Many other improvements and fixes
Dev:

FFmpeg download scripts replaced by a single script/downloadFfmpeg.ts
.gitattributes forces LF line endings for lint-checked files (thanks @vizyul #3061)

Lossless cutting of most video and audio formats
Smart cut (experimental)
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)
Remove unneeded tracks
Replace or re-encode only some tracks
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 (note: no mass export yet)
Keyboard shortcut workflow
Losslessly remux video/audio into a different container (file) format
Take full-resolution snapshots from videos in JPEG/PNG format (low or high quality)
Export ranges of video frames to images (every nth frame, second, by scene change, best thumbnails)
Export only from a selected time range (segment)
Optionally include original timestamps in image file names
Manual input of cutpoint times
Apply a per-file timecode offset (and auto load timecode from file)
Edit file metadata, per-track metadata and per-track disposition
Change rotation/orientation metadata in videos
View technical data about all tracks
Timeline zoom and frame/keyframe jumping for cutting around keyframes
Video thumbnails and audio waveform
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
Annotate segments with tags
Import/export segments: MP4/MKV chapter marks, Text file, You Tube, CSV, CUE, XML (DaVinci, Final Cut Pro) and more
MKV/MP4 embedded chapters marks editor
View subtitles
Customizable keyboard hotkeys
Black scene detection, silent audio detection, and scene change detection
Divide timeline into segments with length L or into N segments or even randomized segments!
Basic CLI support

Supported formats
Since LosslessCut is based on Chromium and uses the HTML5 video player, not all FFmpeg supported formats will be supported smoothly. The following formats/codecs should generally work: MP4, MOV, WebM, MKV, OGG, WAV, MP3, AAC, H264, Theora, VP8, VP9 For more information about supported formats / codecs, see https://www.chromium.org/audio-video.

Unsupported files can still be converted to a supported format/codec from the File menu. (Try the "fastest" option first.) A low quality version of the file (with/without audio) will then be created and opened in the player. The actual cut/export operation will still be performed on the original file, so it will be lossless. This allows for potentially opening any file that FFmpeg is able to decode.