Priority 2: FFmpeg Volume Control
- Moved volume processing from Go to FFmpeg -af volume filter
- Eliminated CPU-intensive per-sample processing loop
- Removed ~40 lines of hot-path audio processing code
- Reduced CPU usage during playback significantly
- Dynamic volume changes restart audio seamlessly
Changes:
- Build FFmpeg command with volume filter
- Remove per-sample int16 processing loop
- Remove encoding/binary import (no longer needed)
- Add restartAudio() for dynamic volume changes
- Volume changes >5% trigger audio restart with new filter
Priority 5: Adaptive Frame Timing
- Implemented drift correction for smooth video playback
- Frame dropping when >3 frames behind schedule
- Gradual catchup when moderately behind
- Maintains smooth playback under system load
Frame Timing Logic:
- Behind < 0: Sleep until next frame (ahead of schedule)
- Behind > 3 frames: Drop frame and resync (way behind)
- Behind > 0.5 frames: Catch up gradually (moderately behind)
- Otherwise: Maintain normal pace
Performance Improvements:
- Audio: No more per-chunk volume processing overhead
- Video: Adaptive timing handles temporary slowdowns
- CPU: Significant reduction in audio processing load
- Smoothness: Better handling of system hiccups
Testing Notes:
- Audio stuttering should be greatly reduced
- Volume changes have ~200ms glitch during restart
- Frame drops logged every 30 frames to avoid spam
- Works with all frame rates (24/30/60 fps)
Still TODO (Priority 3):
- Single FFmpeg process for perfect A/V sync
- Currently separate video/audio processes can drift
Refactoring:
- Create inspect_module.go (292 lines)
- Move showInspectView() and buildInspectView()
- Reduce main.go from 14,329 to 14,116 lines (-213 lines)
- Reduce main.go from 426KB to 420KB
This is the first step in modularizing main.go to improve:
- Windows build performance (currently 5+ minutes)
- Code maintainability and organization
- Following established pattern from author_module.go and subtitles_module.go
Remaining modules to extract:
- player, compare, thumb, filters, upscale, merge, convert, queue, benchmark
Convert Module:
- Add "Add All to Queue" button when multiple videos loaded
- Batch-add all loaded videos to queue with one click
- Remove confirmation dialogs for faster workflow
- Queue button updates immediately to show new count
- Button only visible when 2+ videos are loaded
Workflow improvements:
- No more clicking through videos one by one to queue
- No "OK" confirmation clicks required
- Queue count updates instantly in View Queue button
- Auto-starts queue after adding jobs
Player Module Drag and Drop:
- Add handleDrop case for player module
- Drag video files onto player to load them
- Works the same way as convert module
- Auto-probe and load first video file from drop
Author Module:
- Enable Author module button in main menu
- Add "author" to enabled modules list (line 1525)
- Module is now clickable and functional
Seeking Fixes:
- Remove debouncing delay for immediate response
- Progress bar now seeks instantly when clicked or dragged
- No more 150ms lag during playback navigation
Frame Stepping Fixes:
- Calculate current frame from time position (current * fps)
- Previously used frameN which resets to 0 on every seek
- Frame stepping now accurately moves ±1 frame from actual position
- Buttons now work correctly regardless of seek history
Technical Details:
- currentFrame = int(p.current * p.fps) instead of p.frameN
- Removed seekTimer and seekMutex debouncing logic
- Immediate Seek() call in slider.OnChanged for responsive UX
Frame Navigation:
- Add frame-by-frame stepping with Previous/Next frame buttons
- Implement StepFrame() method for precise frame control
- Auto-pause when frame stepping for accuracy
- Display real-time frame counter during playback
Responsive Scrubbing:
- Add 150ms debounce to progress bar seeking
- Prevents rapid FFmpeg restarts during drag operations
- Smoother user experience when scrubbing through video
Player Session Improvements:
- Track frame numbers accurately with frameFunc callback
- Add duration field for proper frame calculations
- Update frame counter in real-time during playback
- Display current frame number in UI (Frame: N)
UI Enhancements:
- Frame step buttons: ◀| (previous) and |▶ (next)
- Frame counter label with monospace styling
- Integrated into existing player controls layout
Technical Details:
- Frame calculation: targetFrame = currentFrame ± delta
- Time conversion: offset = frameNumber / fps
- Clamp frame numbers to valid range [0, maxFrame]
- Call frameFunc callback on each displayed frame
Foundation ready for future enhancements (keyboard shortcuts, etc.)
- Add authorClips, authorSubtitles, authorOutputType fields to appState
- Create authorClip struct for video clip management
- Implement drag-and-drop support for video clips and subtitles
- Add Settings tab with output type, region, aspect ratio options
- Create Video Clips tab with file management
- Add Subtitles tab for track management
- Prepare framework for DVD/ISO generation
- Update HandleAuthor to work with drag-and-drop system
- Add comprehensive file validation and error handling
- Support for multiple video clips compilation
- Ready for chapter detection and DVD authoring implementation
Queue UI:
- Fix pending job button labels - now shows "Remove" instead of "Cancel"
- Running/paused jobs still correctly show "Cancel" button
Log Viewer:
- Fix app hanging when viewing large conversion logs
- Make file reads asynchronous to prevent blocking UI thread
- Show "Loading log file..." message while reading
- Auto-scroll to bottom when log opens
Windows Console Flashing:
- Add ApplyNoWindow to all missing exec.Command calls
- Fixes command prompt windows flashing during module operations
- Applied to: hwaccel detection, encoder checks, Python backend detection
- Prevents console windows from appearing during upscale module usage
Resolved issue where window would resize itself based on dynamic content
like progress bars and queue updates. Window now maintains the size that
the user sets, regardless of content changes.
**Problem:**
- When progress bars updated or queue content changed, the window would
automatically resize to fit the new content MinSize
- This caused the window to get larger or smaller unexpectedly
- User-set window size was not being preserved
**Solution:**
- Modified setContent() to capture current window size before setting new content
- Restore the window size after SetContent() completes
- This prevents Fyne from auto-resizing based on content MinSize changes
- Window only resizes when user manually drags edges or maximizes
**Impact:**
- Window maintains stable size through all content changes
- Progress bars, queue updates, and module switches no longer trigger resize
- User retains full control of window size via manual resize/maximize
- Improves professional appearance and user experience
Reported by: Jake
Renamed "DVD Author" to "Author" for broader disc production workflow.
Created foundation for complete authoring pipeline with three main tasks:
**Module Structure:**
- Tabbed interface with Chapters, Rip DVD/ISO, and Author Disc tabs
- Added authorChapter struct (timestamp, title, auto-detected flag)
- Added author module state fields (file, chapters, threshold, detecting)
**Chapters Tab (Basic UI):**
- File selection with video probing integration
- Scene detection sensitivity slider (0.1-0.9 threshold)
- Placeholder UI for chapter list and controls
- Add Chapter and Export Chapters buttons (placeholders)
- Foundation for FFmpeg scdet scene detection
**Rip DVD/ISO Tab:**
- Placeholder for high-quality disc extraction
- Will support lossless ripping (like FLAC from CD)
- Preserve all audio/subtitle tracks
**Author Disc Tab:**
- Placeholder for VIDEO_TS/ISO creation
- Will support burn-ready output, NTSC/PAL, menus
Changes:
- Modified main.go: Added authorChapter struct, author state fields,
showAuthorView(), buildAuthorView(), buildChaptersTab(),
buildRipTab(), buildAuthorDiscTab()
- Modified internal/modules/handlers.go: Renamed HandleDVDAuthor to
HandleAuthor with updated comment
- Updated DONE.md with Author module skeleton details
Next steps: Implement FFmpeg scene detection, chapter list UI,
and DVD/ISO ripping functionality.
Added advanced audio channel remixing features for videos with imbalanced
left/right audio channels (e.g., music in left ear, vocals in right ear).
New audio channel options using FFmpeg pan filter:
- Left to Stereo: Copy left channel to both speakers
- Right to Stereo: Copy right channel to both speakers
- Mix to Stereo: Downmix both channels together evenly
- Swap L/R: Swap left and right channels
Changes:
- Updated audioChannelsSelect dropdown with 8 options (was 4)
- Implemented pan filter logic in all 4 FFmpeg command builders:
- buildFFmpegCommandFromJob (main convert)
- DVD encoding function
- Convert command builder
- Snippet generation
- Removed unused "os" import from internal/convert/ffmpeg.go
- Updated DONE.md with audio channel remixing feature
The pan filter syntax allows precise channel routing:
- pan=stereo|c0=c0|c1=c0 (left to both)
- pan=stereo|c0=c1|c1=c1 (right to both)
- pan=stereo|c0=0.5*c0+0.5*c1|c1=0.5*c0+0.5*c1 (mix)
- pan=stereo|c0=c1|c1=c0 (swap)
