Open the file in and test fast seeking (press Ctrl + Arrow Left/Right ). If the position jumps instantly, the index is working. 4. GUI Alternatives (If You Prefer Not to Use the Command Line) | Tool | Steps | Pros | Cons | |------|-------|------|------| | Avidemux | 1. Load AVI → 2. Copy video & audio → 3. Save as new AVI | Very intuitive, visual confirmation | Slightly slower on huge files | | VirtualDub | 1. File → Open AVI → 2. Video → Source → Direct Stream Copy → 3. File → Save As AVI | Good for batch scripts via command line | Windows‑only, outdated UI | | MKVToolNix (mkvmerge) | Convert AVI → MKV, then mkvextract to rebuild index and finally ffmpeg -c copy back to AVI | Handles broken streams gracefully | Requires an extra conversion step |
