openframeworks / openframeworks/openFrameworks
ofGstVideoGrabber::listDevices() : ofVideoDevice::format is empty if device is not initialize:
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Description
This is on Linux 16.04.1 with of 0.9.3 and ofGstVideoGrabber
Calling ofVideoGrabber::listDevices() before ofVideoGrabber::setup() return empty vector for each video device.
Calling setup a second time to set the video format doesn't work.
As a workaround we can initialize a temporary ofVideoDevice, initialize it with a small resolution, get it's video format, delete it and create a new one the chosen video format.
But I think ofGstVideoGrabber should handle this silently and return video format even if device is not initialized.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by inspecting ofGstVideoGrabber::listDevices() and the ofVideoGrabber::setup() entry point on Linux. Reproduce the uninitialized-device case, then verify that each listed device has a populated ofVideoFormat and that a second setup with the selected format works without the temporary-device workaround.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, linux
- Domain
- audio-video-rtc
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100