Video gpx script
|It has been proposed that this page or section be merged with video mapping. (Discuss)|
Photo mapping is all very nice if you're prepared to take loads of photos manually, but sometimes you just want to leave the video camera running and get a set of images that you can browse on the map
Please add to this page if you know any other Free software which does similar things.
- A video
- A GPX file
- The time according to your GPS when the video starts
- How many frames per second the video is recorded at
Open the video in avidemux, and File → Save → "save selection as JPEG images". This will create thousands of JPEG images from the frames of the video
python video_gpx.py [path_to_images] [gpx_filename] [start_time] [fps]
- images should be of the form "somePrefix_0001.jpg"
- images don't need valid timestamps or EXIF
- start time should be in the format "2009-07-26T09:52:17Z", and can be copy/pasted out of your GPX file
- fps will be something like "25" or "30"
Finding the frame-rate:
- in avidemux, Video → frame rate
- In VLC, Tools → codec information (or ctrl-J)
- Currently assumes that the video is a fixed number of frames per second (since we don't get any timestamps out of avidemux's JPEG images, only the frame numbers)
- Currently only works if GPX points are dense enough (<3sec apart)
- Not sure how well it handles timezones
- Still has hardcoded references to Ojw's website on dev, and hardcoded output locations (frames/ directory and output.kml)
Storing the results
Viewing the results
TODO: someone write a nice OpenStreetView viewer please?
Debug output - just KML files to show the georeferencing: deadlinkhttp://dev.openstreetmap.org/~ojw/StreetPhotos/
- deadlinkhttp://dev.openstreetmap.org/~ojw/StreetPhotos/test3/output.kml - using the 'good' camera linked above (wide-angle, locked to 25fps)
- Video mapping - Ideas around different approaches to video mapping.