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Tasklist

FS#36092 - [opencv] capture module doesn't work with live video

Attached to Project: Arch Linux
Opened by Hartmut Seichter (seichterh) - Wednesday, 10 July 2013, 12:05 GMT
Last edited by Ray Rashif (schivmeister) - Friday, 12 July 2013, 16:32 GMT
Task Type Bug Report
Category Upstream Bugs
Status Closed
Assigned To Ray Rashif (schivmeister)
Architecture All
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:

Not sure if this is another upstream bug, because it could also be a packaging bug. It seem that live video capture via the VideoCapture::open(int) method doesn't work which hints towards a missing live-video backend (v4l or GStreamer). Capturing from files, seemingly via FFMPEG, does work.


Additional info:
* package version(s): 2.4.6-1

Steps to reproduce:
use one of the examples and try to use a live video device (0 => /dev/video0)

This task depends upon

Closed by  Ray Rashif (schivmeister)
Friday, 12 July 2013, 16:32 GMT
Reason for closing:  Fixed
Comment by Ray Rashif (schivmeister) - Thursday, 11 July 2013, 18:20 GMT
  • Field changed: Status (Unconfirmed → Assigned)
  • Field changed: Architecture (x86_64 → All)
  • Field changed: Severity (Medium → High)
  • Task assigned to Ray Rashif (schivmeister)
You are right. Using http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html#videocapture to test, and indeed the opening of the device fails. You are also right that this may be a packaging bug - I'll see to it. Thanks for reporting.
Comment by Ray Rashif (schivmeister) - Thursday, 11 July 2013, 20:29 GMT
  • Field changed: Category (Packages: Extra → Upstream Bugs)
What do you know, it's actually a regression:

http://answers.opencv.org/question/16326/webcam-wont-open-since-246/

You can confirm this with a rebuild of a previous version or a binary from ARM. [1] So, fortunately or unfortunately, upstream bug.

[1] http://arm.konnichi.com/search/
Comment by Ray Rashif (schivmeister) - Friday, 12 July 2013, 14:00 GMT
  • Field changed: Status (Assigned → Waiting on Response)
Package updated with latest upstream revision released to fix this. Please test .1 in [extra] and confirm that it's working.
Comment by Hartmut Seichter (seichterh) - Friday, 12 July 2013, 15:04 GMT
Yes, works as expected. Thanks a lot!

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