Femon-plugin
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Description
Shows DVB signal information on the OSD.
-------------------------------------------------------------- |## Channel Name ######################### [DD][AR][VF][A][D]| |[==== Signal Strength in % ==============|=================]| |[==== Signal-to-Noise Ratio in % ========|=================]| | STR: #0000 (0%) BER: #00000000 Video: 0 Mbit/s | | SNR: #0000 (0%) UNC: #00000000 Audio: 0 kbit/s | | [LOCK] [SIGNAL] [CARRIER] [VITERBI] [SYNC] | -------------------------------------------------------------- STR - Signal strength SNR - Signal-to-noise ratio BER - Bit error rate UNC - Uncorrected blocks Video - Calculated video bitrate in Mbit/s Audio - Calculated audio / AC-3 bitrate in kbit/s LOCK - Everything's working... SIGNAL - Found something above the noise level CARRIER - Found a DVB signal VITERBI - FEC (forward error correction) is stable SYNC - Found sync bytes DD - AC-3 stream (optional) AR - Aspect Ratio: 1:1/4:3/16:9/2.21:1 (optional) VF - Video format: PAL/NTSC (optional) A - Audio track: 1..2 (optional) D - Device number: 0..3 (optional)
Hardware requirements
- DVB card
Software requirements
Installation
Options
# added preliminary NTSC support NTSC_SYSTEM=1
Handling
| Key | Description |
|---|---|
| ChanUp/ChanDn | Switch channel up/down |
| Up/Down | Switch channel up/down |
| 0-9 | Select channel |
| Ok | Switch between display modes: basic, transponder, stream, AC-3 |
| Right/Left | Switch to next/previous device that provides the current channel |
| Green | Select language (APID) |
| Back | Exit plugin |
Problems
- The plugin supports only those DVB cards with _one_ frontend (do any cards with multiple frontends even exist?), because I haven't yet figured howto do it without patching the VDR core.
- Sometimes (read always) ttxtsubs plugin messes up the OSD - user should disable ttxtsubs, but closing and reopening the femon plugin might help temporarily as well. Btw., this same thing happens with OSDTeletext plugin too :)
- Disable the stream analysis to speed up heavy zapping sessions.
- The signal strength and signal-to-noise ratio values are comparable only between the same brand/model frontends. Due to the lack of proper frontend specifications those values cannot be calculated into any real units.
- Shrinked OSD is available for NTSC users: make NTSC_SYSTEM=1
- The device switching feature is still non-functional.
Links
| [1] | http://www.saunalahti.fi/~rahrenbe/vdr/femon | Plugin homepage |