Troubleshooting Guide
Quick solutions to common video processing issues
Quick Diagnostic
Select your issue to jump to the solution:
❌ Processing Failed or Stuck
Common Causes:
- Video file is corrupted or invalid
- Browser ran out of memory
- FFmpeg.wasm failed to load
- Unsupported video codec
- Browser tab was put in background during processing
Solutions (Try in Order):
Step 1: Basic Refresh
Press Ctrl+Shift+R (Windows/Linux) or Cmd+Shift+R (Mac) to hard refresh the page.
Step 2: Test Video File
Play your video in a local video player (VLC, Windows Media Player) to ensure it's not corrupted.
Step 3: Try a Smaller Test File
Upload a small video (<50MB, <2 minutes) to verify VidSpeed works on your device.
Step 4: Close Other Tabs
Close all other browser tabs and applications to free up memory.
Step 5: Use Lower Quality
Select "Low Quality" preset to reduce processing requirements.
Step 6: Try Different Browser
Switch to Chrome or Edge (best WebAssembly performance).
Still not working? Check the browser console (F12) for error messages, or try using a different video file format.
⚠️ Memory Warning or Browser Crash
What's Happening:
Video processing is memory-intensive. Large files (>500MB) or long videos (>1 hour) can require 2-4GB of RAM or more. Your browser may slow down, freeze, or crash if it runs out of available memory.
Immediate Solutions:
Free Up Memory
Close ALL other browser tabs, quit other applications, restart your browser.
Use Low Quality Preset
Select "Low Quality" preset - uses 50% less memory than High Quality.
Split Large Videos
Use a video editor to split your video into smaller segments, then process each separately.
Use Desktop Computer
Mobile devices and laptops have less RAM. Use a desktop PC for large files.
Plug In Your Device
Ensure device is plugged in - battery-saving modes limit performance.
Memory Requirements: Small video (<100MB): 1-2GB RAM | Medium (100-500MB): 2-4GB RAM | Large (>500MB): 4-8GB RAM
🔊 Audio is Distorted or "Chipmunk" Effect
Why This Happens:
When you change video speed, the audio naturally changes too:
- Speed up (2x): Audio pitch increases → sounds like chipmunks
- Slow down (0.5x): Audio pitch decreases → sounds deep and slow
✅ Solution: Enable Pitch Correction
- In the Audio Processing section
- Select "Adjust speed with pitch correction (recommended)"
- Process your video again
Note: Pitch correction adds 10-20% more processing time but keeps audio sounding natural.
Other Audio Options:
Keep Original Audio
Audio plays at normal speed while video is sped up/slowed down. Creates sync issues.
Remove Audio Completely
Silent video. Useful for timelapse videos or when adding custom music later.
⏱️ Processing Takes Too Long
Expected Processing Times:
Short Video (<5 min, <100MB)
30s - 2min
Medium Video (5-20 min, 100-500MB)
2 - 10min
Long Video (20-60 min, 500MB-1GB)
10 - 30min
Very Long (>1 hour, >1GB)
30+ min
Speed Up Processing:
Use Low or Medium Quality Preset
Can reduce processing time by 40-60%
Disable Pitch Correction
If you don't need natural audio pitch, disable it
Choose MP4 Output Format
MP4 encodes faster than WebM (but larger file size)
Use Desktop Instead of Mobile
Desktop computers process 3-5x faster than phones/tablets
Use Chrome or Edge
Best WebAssembly performance compared to other browsers
📱 Not Working on Mobile/iOS
Mobile Support Status:
✅ iOS Safari (iPhone/iPad)
Works for small videos (<200MB). Larger files may crash due to memory limits.
✅ Android Chrome
Works well for medium videos (<500MB). Performance depends on device RAM.
⚠️ Mobile Firefox
Works but slower than Chrome. Use for small files only.
Tips for Mobile Processing:
- Keep videos under 200MB for best results
- Close ALL other apps before processing
- Use Low Quality preset
- Ensure device has 50%+ battery or is plugged in
- Keep browser tab active (don't switch apps during processing)
- For large videos, use a desktop/laptop computer
Recommendation: For videos larger than 500MB or longer than 20 minutes, use a desktop or laptop computer for reliable processing.
▶️ Processed Video Won't Play
Common Causes & Solutions:
Codec Not Supported by Player
Solution: Try opening the video in different players:
- VLC Media Player (plays everything)
- Chrome browser (drag video file into browser)
- Windows Media Player / QuickTime
Processing Was Interrupted
Solution: Re-process the video and wait for 100% completion before downloading.
Video Format Incompatible with Device
Solution: Try different output format:
- For maximum compatibility: Use MP4 (H.264)
- For Apple devices: Use MOV
- For modern browsers: WebM works best
📦 Processed File Too Large or Too Small
File Size Too Large:
Why: High Quality preset uses higher bitrate for better visual quality.
Solutions:
- Use Medium or Low Quality preset
- Choose WebM format (30-50% smaller than MP4)
- Lower resolution if that option becomes available
File Size Too Small (Poor Quality):
Why: Low Quality preset reduces bitrate to speed up processing.
Solutions:
- Use High Quality preset
- Choose MP4 format over WebM
- Source video quality limits output quality (can't improve low-quality source)
Typical file sizes: High Quality: 80-120% of original | Medium: 50-80% | Low: 30-50%
🌐 Browser Compatibility Issues
Browser Support:
✅ Google Chrome 57+
Recommended - Best performance
✅ Microsoft Edge 16+
Recommended - Same engine as Chrome
⚠️ Firefox 52+
Works but may be slower
⚠️ Safari 11+
Works on macOS/iOS, some limitations on large files
❌ Internet Explorer
Not supported - No WebAssembly support
Requirements:
- WebAssembly (WASM) support
- JavaScript enabled
- Modern browser version (updated within last 2 years)
- 4GB+ RAM (8GB recommended for large files)
- Stable internet connection for initial FFmpeg.wasm download (~30MB)
Best Setup: Chrome/Edge browser on desktop computer with 8GB+ RAM for optimal performance.
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