HMP video output
From SpinetiX Support Wiki
This page is about the HMP Video Output. For details about media formats and video resolutions within projects, see Video decoding page.
- The HMP350 and HMP300 have one video output connectors: an HDMI connector (type A).
- The HMP200 and HMP130 have two video output connectors: an HDMI connector (type A) and a VGA connector (DE-15).
To connect a DVI display, you can use an adapter (HDMI / VGA to DVI).
Only progressive (i.e. not interlaced) output video modes are supported and the output video signal is always RGB. Generic video timings are also supported in addition to the standard 720p / 1080p. See the Display settings page for more details.
- The HMP supports underscan for the HDMI connection, meaning that all pixels of the image are displayed by the screen, which is standard behavior for computer monitors as opposed to consumer televisions.
- HDMI Consumer Electronics Control (CEC) protocol is supported on HMP300 / HMP350, but not supported on older models.
- The HMP does not output an HDCP (High-bandwidth Digital Content Protection) protected video signal, and no HDCP support is required on the displaying device. HDCP enabled displays or repeaters can be used with the HMP.
If the connected device doesn't detect the HMP video output signal, most probably, the selected video mode is not supported by your displaying device. In this case, you need to change the display settings or to reset the HMP to factory default settings.
By default, the HMP turns on the VGA output signal only if a screen is detected using the Display Data Channel (DDC) signal and turns it off otherwise. That's because the VGA power consumption is up to 50% of the total power consumption of the player. This can be changed from HMP Control Center > Display Settings page > Power Save tab.
- If the screen does not provide a DDC signal or the cable does not have the DDC pin connected (this is typical of some plasma screens with legacy support for analogue devices), the HMP will not output the VGA signal. In this case, the "VGA output enable" option must be set to "Always On".
Resolutions above 720p will show a considerable quality degradation when using VGA output port (this is a limitation of VGA) and it is recommended to use the HDMI output for any HD resolutions.
- Some older LCD/Plasma screens, often without HDMI (like Samsung SyncMaster 242MP LCD TV), have a low-capability analogue-to-digital converter inside the display which cannot handle resolutions above 1024x768. You will not see an image on the screen when using the VGA connected with an HMP configured with a higher resolution. The solution is to buy an HDMI to DVI adapter.
Using both ports simultaneously
The HMP will output the same video signal to both VGA and HDMI ports, therefore it is possible to connect two displays to both output ports in the same time. However, this is not recommended for various reasons:
- This will increase the operating temperature of the device, which is of particular importance with the HMP200 model.
- The power consumption will increase considerably since VGA power consumption is up to 50% of the total power consumption of the player.
- The display settings are identical for both displays (matching those entered on HMP Control Center > Display Settings page), thus you cannot use particular display settings if the other display doesn't support them.
Cable length limitations
The HMP is primarily designed to be local to the screen(s) it serves. If extension over long distances if required, note the limitations below and/or consider using a combined distribution system (such as those based on HDBase-T).
- Although no maximum length for an HDMI cable is specified, signal attenuation (dependent on the cable's construction quality and conducting materials) limits usable lengths in practice - see HMDI Cables page for more details.
- Running Long Cable Lengths requires a better quality of HDMI cable and / or HDMI extenders.
- VGA cable length depends on a few factors, but as with HDMI the quality of the cable is the significant factor. However because VGA is an analogue signal, poor cable quality and/or over-extended cables will result in a progressive reduction in capability in terms of resolution and refresh rate.
- If you experience the splash screen of the HMP being displayed, but then the screen staying blank, this is an example of the low 640x480 VGA resolution being displayed, but the higher resolution of the player with a higher effective bandwidth (e.g. 720p) not being displayed because of the signal loss being too great.
- If long VGA cables are being used (e.g. 5m+) ensure they are high quality coaxial cable bundles. Alternatively use a booster or Cat5 balun (this will allow for sending up to 100 meters, depending on the Cat5 cable spec).