Kdenlive provides functionality for capturing video from external devices; e.g., Firewire, FFmpeg, Screen Grab and Blackmagic.
You configure video capturing from here).(more on this
You define the destination location for your captures by using here).(more on this
To execute a video capture, select the Record Monitor and choose the capture device from the dropdown in the bottom right.
This option is not available in recent versions of Kdenlive. Use dvgrab directly in a terminal to capture video from firewire.
This captures video from sources connected via a firewire (also known as - IEEE 1394 High Speed Serial Bus) card and cable. This functionality uses the dvgrab program and the settings for this can be customized by clicking the spanner icon or choosing . See Configure Firewire Capture.
To perform a capture:
- Plug in your device to the firewire card and turn it on to play mode
- Click the Record Button — note it toggles to grey while you are recording
- Click the Record button again to stop capture. Or click the stop button.
- In the Captured Files dialog, click the import button to have the captured files automatically imported into the project bin.
I believe this captures video from an installed Web Cam using Video4Linux2.
This captures video of the PC screen. In version 0.9.2 it uses recordMyDesktop to do the capture. There is an open defect with this functionality in ver 0.9.2 — See bug tracker ID 2643.
In version 0.9.3, the screen grab is done by the ffmpeg functionality instead. For screen capture to work in ver 0.9.3, the version of ffmpeg installed needs to have been compiled with the
--enable-x11grab option. Ubuntu comes with an ffmpeg version compiled with this option.
To check on your linux distro, type
ffmpeg -version in a terminal and look for
--enable-x11grab in the reported configuration info. 
If you are capturing the screen and using the X246 with audio settings and you get a crash as shown in the screen shot ...
... then consider creating a profile for audio capture where
-acodec pcm_s16le is replaced by
-acodec libvorbis -b 320k. See Configure Kdenlive.
- There are now two branches of ffmpeg: a Libav branch and an ffmpeg.org branch. The ffmpeg version from the latter branch reports the configuration when you run with
ffmpeg -version. The Libav version does not. So this method to check for the
--enable-x11grabdoes not work if you have the Libav version of ffmpeg.