^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) .. SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) ======================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) Avermedia DVB-T on BT878 Release Notes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) ======================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) February 14th 2006
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) .. note::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) Several other Avermedia devices are supported. For a more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) broader and updated content about that, please check:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) https://linuxtv.org/wiki/index.php/AVerMedia
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) The Avermedia DVB-T
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) ~~~~~~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) The Avermedia DVB-T is a budget PCI DVB card. It has 3 inputs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * RF Tuner Input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Composite Video Input (RCA Jack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * SVIDEO Input (Mini-DIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) The RF Tuner Input is the input to the tuner module of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) card. The Tuner is otherwise known as the "Frontend" . The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) Frontend of the Avermedia DVB-T is a Microtune 7202D. A timely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) post to the linux-dvb mailing list ascertained that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) Microtune 7202D is supported by the sp887x driver which is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) found in the dvb-hw CVS module.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) The DVB-T card is based around the BT878 chip which is a very
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) common multimedia bridge and often found on Analogue TV cards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) There is no on-board MPEG2 decoder, which means that all MPEG2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) decoding must be done in software, or if you have one, on an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) MPEG2 hardware decoding card or chipset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) Getting the card going
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) ~~~~~~~~~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) At this stage, it has not been able to ascertain the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) functionality of the remaining device nodes in respect of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) Avermedia DVBT. However, full functionality in respect of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) tuning, receiving and supplying the MPEG2 data stream is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) possible with the currently available versions of the driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) It may be possible that additional functionality is available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) from the card (i.e. viewing the additional analogue inputs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) that the card presents), but this has not been tested yet. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) I get around to this, I'll update the document with whatever I
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) find.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) To power up the card, load the following modules in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) following order:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * modprobe bttv (normally loaded automatically)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * modprobe dvb-bt8xx (or place dvb-bt8xx in /etc/modules)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) Insertion of these modules into the running kernel will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) activate the appropriate DVB device nodes. It is then possible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) to start accessing the card with utilities such as scan, tzap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) dvbstream etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) The frontend module sp887x.o, requires an external firmware.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) Please use the command "get_dvb_firmware sp887x" to download
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) it. Then copy it to /usr/lib/hotplug/firmware or /lib/firmware/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) (depending on configuration of firmware hotplug).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) Known Limitations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ~~~~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) At present I can say with confidence that the frontend tunes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) via /dev/dvb/adapter{x}/frontend0 and supplies an MPEG2 stream
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) via /dev/dvb/adapter{x}/dvr0. I have not tested the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) functionality of any other part of the card yet. I will do so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) over time and update this document.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) There are some limitations in the i2c layer due to a returned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) error message inconsistency. Although this generates errors in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) dmesg and the system logs, it does not appear to affect the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ability of the frontend to function correctly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) Further Update
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) ~~~~~~~~~~~~~~
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) dvbstream and VideoLAN Client on windows works a treat with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) DVB, in fact this is currently serving as my main way of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) viewing DVB-T at the moment. Additionally, VLC is happily
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) decoding HDTV signals, although the PC is dropping the odd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) frame here and there - I assume due to processing capability -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) as all the decoding is being done under windows in software.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) Many thanks to Nigel Pearson for the updates to this document
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) since the recent revision of the driver.
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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