The file is working. Here's a summary of all the changes made:

**Speed Variation Controls:**
- Added "Speed Change Intensity" slider (overall intensity)
- Added "Speed Up Frequency" slider (how often to speed up)
- Added "Slow Down Frequency" slider (how often to slow down)
- Added "Enable Speed Changes" checkbox toggle

**Mirror/Flip Effect (New Panel):**
- Added "Mirror Frequency" slider (how often flips occur)
- Added "Mirror Duration" slider (how long flips last)
- Added "Horizontal Flip" checkbox
- Added "Vertical Flip" checkbox

**Boomerang Effect Enhancements:**
- Added "Repeat Cycles" slider (1x-6x) to control how many forward/reverse cycles
- Renamed labels for clarity

**Visual Effects Enhancements:**
- Added "Hue Shift Amount" slider (0°-360°)
- Added "Hue Change Frequency" slider (how often random hue changes occur)
- Added "Saturation Boost" slider (0%-200%)
- Added "Rainbow Cycling Mode" checkbox (continuous color cycling)

**Content Effects Updates:**
- Removed "Meme Insertion Frequency" (non-functional)
- Added "Stutter Effect Frequency" slider (repeats single frames rapidly)
- Added "Freeze Frame Frequency" slider

**Cancel Button:**
- Added red "Cancel Generation" button during processing
- Properly stops all media processing, audio context, and video playback

**New Presets:**
- "Rainbow Trip" - colorful psychedelic effects
- "Extreme Chaos" - maximum everything