ElegantMedia 3D Photogrammetry
- Download suitable video from YouTube. Find drone footage which moves through a space or around a prominent feature, such as a landmark or people who don’t move much.
- I used Firefox browser with the Video Download Helper addon
- Use VLC to make an image sequence from the video
- Create a folder to store your frames and copy the path to it. For Mac OSX/Linux users, this must be the full path (no ~).
- Click Tools → Preferences in VLC.
- Under “show settings”, click “all”.
- Under “Video”, select “Filters”. Tick “Scene video filter”.
- Expand “Filters” and select “Scene filter”,
- Paste the path from earlier into “directory path prefix”.
- Decide what proportion of the frames you want to export. For example, if you want to export 1 in 12 frames, type “12” in the “recording ratio” box.
- Click “save”.
- Click Media → Open Video and find your video. Patiently let the whole thing play.
- Click Tools → Preferences. Under “show settings”, click “all”. Under “video”, select “filters”. Uncheck “Scene video filter”. Click “save”. This is so that VLC won’t generate thumbnails the next time you play a video.
- Open the folder you created earlier. The thumbnails should be there.
- Import the sequence into PhotoScan and process as usually. If the video had many scenes I would process each scene as a ‘chunk’ in a master PhotoScan file.
- For a more complete workflow description see this excellent tutorial PDF by Claire Hentschker