{"action":"created","issue":{"url":"https://api.github.com/repos/diydrones/ardupilot/issues/1998","labels_url":"https://api.github.com/repos/diydrones/ardupilot/issues/1998/labels{/name}","comments_url":"https://api.github.com/repos/diydrones/ardupilot/issues/1998/comments","events_url":"https://api.github.com/repos/diydrones/ardupilot/issues/1998/events","html_url":"https://github.com/diydrones/ardupilot/issues/1998","id":63207273,"number":1998,"title":"Dataflash logging drops messages without any explicit indication in high-load situations","user":{"login":"hsteinhaus","id":3057137,"avatar_url":"https://avatars.githubusercontent.com/u/3057137?v=3","gravatar_id":"","url":"https://api.github.com/users/hsteinhaus","html_url":"https://github.com/hsteinhaus","followers_url":"https://api.github.com/users/hsteinhaus/followers","following_url":"https://api.github.com/users/hsteinhaus/following{/other_user}","gists_url":"https://api.github.com/users/hsteinhaus/gists{/gist_id}","starred_url":"https://api.github.com/users/hsteinhaus/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hsteinhaus/subscriptions","organizations_url":"https://api.github.com/users/hsteinhaus/orgs","repos_url":"https://api.github.com/users/hsteinhaus/repos","events_url":"https://api.github.com/users/hsteinhaus/events{/privacy}","received_events_url":"https://api.github.com/users/hsteinhaus/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-03-20T10:45:21Z","updated_at":"2015-03-20T10:55:52Z","closed_at":null,"body":"Some flights with LOG_BITMASK set to -1 and a camera triggered by ArduCopter revealed that log messages can get lost (camera had pictures that did not correspond to an appropriate CAM message). During this flight, about 1% of all CAM messages got lost.\r\n\r\nDuring tests with reduced logging but identical hardware and software no CAM messages got lost. The SD card (original 3DR) did not show any performance or block error issues.\r\n\r\nCurrently it is not possible to detect this situation by looking on the log only. This effect can make log analysis hard to impossible in certain situations. Additionally, the current behavior can seriously mess up any kind of mapping mission, that relies on a complete camera trigger log for geo-referencing of the taken images.\r\n\r\nSee also here: https://groups.google.com/forum/#!searchin/drones-discuss/hickup/drones-discuss/tlE_PRpuW4w/b1fD2MCgdswJ\r\n"},"comment":{"url":"https://api.github.com/repos/diydrones/ardupilot/issues/comments/83985562","html_url":"https://github.com/diydrones/ardupilot/issues/1998#issuecomment-83985562","issue_url":"https://api.github.com/repos/diydrones/ardupilot/issues/1998","id":83985562,"user":{"login":"hsteinhaus","id":3057137,"avatar_url":"https://avatars.githubusercontent.com/u/3057137?v=3","gravatar_id":"","url":"https://api.github.com/users/hsteinhaus","html_url":"https://github.com/hsteinhaus","followers_url":"https://api.github.com/users/hsteinhaus/followers","following_url":"https://api.github.com/users/hsteinhaus/following{/other_user}","gists_url":"https://api.github.com/users/hsteinhaus/gists{/gist_id}","starred_url":"https://api.github.com/users/hsteinhaus/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hsteinhaus/subscriptions","organizations_url":"https://api.github.com/users/hsteinhaus/orgs","repos_url":"https://api.github.com/users/hsteinhaus/repos","events_url":"https://api.github.com/users/hsteinhaus/events{/privacy}","received_events_url":"https://api.github.com/users/hsteinhaus/received_events","type":"User","site_admin":false},"created_at":"2015-03-20T10:55:52Z","updated_at":"2015-03-20T10:55:52Z","body":"Forgot to mention that I used ArduCopter 3.2.1 . \r\n\r\nThe spatial jitter of the CAM messages is excellent, (<<1m difference from configured interval), so I guess this issue is not related to cam triggering."}}