Please connect an analog or digital camera to the composite or HDMI video input of the P.CORDER.
Composite Video Input
The composite video input is a 3.5 mm jack with 4 contacts for connecting line in audio (stereo) and composite video:
- Tip: audio line in (left channel)
- 1st ring: audio line in (right channel)
- 2nd ring: composite video in
- sleeve: ground
A short adapter cable with a 3.5mm plug on one end and three RCA jacks on the one end is supplied with the P.CORDER. It is ok, to just plug in a stereo audio cable. In this case the composite video in will be shorted to ground (no video input). The composite video input accepts a PAL or NTSC video source.
HDMI Video Input
The HDMI video input accepts the HDMI video output from various video sources such as digital photo cameras (DSLRs), digital consumer camcorders and professional video cameras. To may be challenge to find an appropriate low cost video source with a clean and high resolution (HD) video output, as many consumer devices only put out video on the HDMI port during playback. However for the P.CORDER you need to supply a live video. So the camera needs to be in "standby" or in record mode.
In respect of their HDMI video output, the DSLR cameras can be put into 4 categories:
- many older models only put out video during playback. For normal applications this type of camera is useless, as you want to supply a live video of the presenter.
- new models now support a live video out during record. This type can be used but imposes some short comings. Many models do not put out clean video, as this mode is targeted to supervise the recording process. The video has an overlay of various symbols or icons and show a record indicator. European models for import tax reasons record a maximum time of 30 min. This possibly shortens your presentation recording time, if you would like to record longer presentations.
- some new models also put out live video while they are not recording. This is much better, as there is not limitations on the recording time. But the video possibly gets overlaid with a black border around the video and icons and symbols.
- some new high end models are designed for external video recording. They behave like a professional camera and put out a clean HDMI video with no compromises. These cameras are the perfect choice for recording with the P.CORDER.
The categories 2 and 3 are widely spread but have some compromises. However the P.CORDER has functions build in, so these cameras can be used with very little compromise.
Video Input Processing
The P.CORDER offers 3 stages of input processing. The first stage is de-interlacing. As further stages require progressive video (such as 720p or 1080p), any interlaced video input such as 480i (NTSC), 576i (PAL) or 1080i must first be de-interlaced to convert the video to progressive video.
The second stage performs scaling. Typically the recording template specifies a relative small video window for the the presenter video. Typically it is 240x320 or 320x480. HD cameras however have a much higher resolution of 720p (1280x720) or 1080p (1920x1080). If you want to maintain the viewing angle of the camera, then you would scale the video down to the vertical resolution of the the target video window, in example 320 or 480 lines. As the aspect ratio of the input (16:9) should be maintained the output resolution of the scaler should be 426x240 or 568x320.
Alternatively the scaler may be set to a higher output resolution to get the effect of a digital zoom. In this case the final cropping stage will reduce the video to its target size. Also the cropping stage can remove any unwanted content such as borders, frames, symbols and icons.
The camera video has 1080p (1920x1080) resolution. First it is scaled down to 1280x720, which keeps the 16:9 aspect ratio of the camera video. Next the video is cropped down to a size of 320x480. This region is marked by the red rectangle in the scaled image. The final cropped image is then composed into the template.