[mythtv-users] How to enable HW MPEG Encoder in Mythtv

Fri Mar 23 12:35:30 UTC 2012

On Fri, Mar 23, 2012 at 5:02 AM, Tony Sauri <hoiho.nz at gmail.com> wrote:

> I am running a mythbuntu 11.10 distribution with the following version of
> mythtv:
>        mythbackend version: fixes/0.24 [v0.24.1-80-g1de0431]
> www.mythtv.org
>
> I have a Hauppauge HVR1300 capture card which has 3 logical capture
> devices:
>
> a) A frame grabber at /dev/video0       Driver: cx8800
> b) An MPEG HW encoder at /dev/video1    Driver: cx88_blackbird
> c) A DVB-T capture device at /dev/dvb/adapter0/frontend0
>                                        Driver: cx88_bvb
>
> AN extract of Dnesg showing the initialisation of the card follows:
>
> [    8.877663] cx88/0: cx2388x v4l2 driver version 0.0.8 loaded
> [    8.877772] cx8800 0000:00:0d.0: enabling device (0014 -> 0016)
> [    8.877819] cx8800 0000:00:0d.0: PCI INT A -> GSI 16 (level, low) ->
> IRQ 16
> [    8.917050] cx88[0]: subsystem: 0070:9600, board: Hauppauge
> WinTV-HVR1300
> DVB-T/Hybrid MPEG Encoder [card=56,autodetected], frontend(s): 1
> [    8.917061] cx88[0]: TV tuner type 63, Radio tuner type -1
> [    8.981378] cx88/2: cx2388x MPEG-TS Driver Manager version 0.0.8 loaded
> [    9.039271] cx88[0]: i2c init: enabling analog demod on
> HVR1300/3000/4000
> tuner
> [    9.844156] cx88[0]: hauppauge eeprom: model=96559
> [    9.918354] cx88[0]/0: found at 0000:00:0d.0, rev: 5, irq: 16, latency:
> 32,
> mmio: 0xf5000000
> [   10.108518] wm8775 1-001b: chip found @ 0x36 (cx88[0])
> [   10.124046] cx88[0]/0: registered device video0 [v4l2]
> [   10.124264] cx88[0]/0: registered device vbi0
> [   10.124440] cx88[0]/0: registered device radio0
> [   10.124604] cx88[0]/2: cx2388x 8802 Driver Manager
> [   10.124630] cx88-mpeg driver manager 0000:00:0d.2: enabling device
> (0014 ->
> 0016)
> [   10.124647] cx88-mpeg driver manager 0000:00:0d.2: PCI INT A -> GSI 16
> (level, low) -> IRQ 16
> [   10.124659] cx88[0]/2: found at 0000:00:0d.2, rev: 5, irq: 16, latency:
> 32,
> mmio: 0xf3000000
> [   10.124915] cx88_audio 0000:00:0d.1: enabling device (0014 -> 0016)
> [   10.124924] cx88_audio 0000:00:0d.1: PCI INT A -> GSI 16 (level, low) ->
> IRQ 16
> [   10.124975] cx88[0]/1: CX88x/0: ALSA support for cx2388x boards
> [   10.654488] cx88/2: cx2388x dvb driver version 0.0.8 loaded
> [   10.654498] cx88/2: registering cx8802 driver, type: dvb access: shared
> [   10.654506] cx88[0]/2: subsystem: 0070:9600, board: Hauppauge
> WinTV-HVR1300
> DVB-T/Hybrid MPEG Encoder [card=56]
> [   10.654514] cx88[0]/2: cx2388x based DVB/ATSC card
> [   10.654518] cx8802_alloc_frontends() allocating 1 frontend(s)
> [   10.859527] DVB: registering new adapter (cx88[0])
> [   10.912343] cx88/2: registering cx8802 driver, type: blackbird access:
> shared
> [   10.912351] cx88[0]/2: subsystem: 0070:9600, board: Hauppauge
> WinTV-HVR1300
> DVB-T/Hybrid MPEG Encoder [card=56]
> [   10.912361] cx88[0]/2: cx23416 based mpeg encoder (blackbird reference
> design)
> [   10.912584] cx88[0]/2-bb: Firmware and/or mailbox pointer not
> initialized
> or corrupted
> [   13.294976] cx88[0]/2-bb: Firmware upload successful.
> [   13.301564] cx88[0]/2-bb: Firmware version is 0x02060039
> [   13.316110] cx88[0]/2: registered device video1 [mpeg]
>
>
> I have tested the hardware on this system outside of the mythtv environment
> and each of the components works flawlessly except for 1 cosmetic(?) bug:
>
> The cx88_blackbird driver or the v4l2-ctl userspace utility fails to return
> the correct result when querying the input source for /dev/video1:
>
> tartarus at locarno:~$ v4l2-ctl -d /dev/video1 -I
> Video input : 0 (Television)
> tartarus at locarno:~$ v4l2-ctl -d /dev/video1 -i 1
> Video input set to 1 (Composite1)
> tartarus at locarno:~$ v4l2-ctl -d /dev/video1 -I
> Video input : 0 (Television)
> tartarus at locarno:~$ v4l2-ctl -d /dev/video1 -i 2
> Video input set to 2 (S-Video)
> tartarus at locarno:~$ v4l2-ctl -d /dev/video1 -I
> Video input : 0 (Television)
> tartarus at locarno:~$
>
> ie  It doesnt matter what the input device is set to it always reports
> Televisin when queried.
>
> I say this is possibly cosmetic because the driver sets up the correct
> input
> device and the correct or expected stream is outpit on /dev/video1.
>
> However when I try to configure the card in myth-setup the /dev/video0 and
> the /dev/dvb/adapter0 devices are set up correctly but when I try and
> configure the /dev/video1 device I am prevented from choosing a hardware
> MHEG
> encoder device because this is not an IVTV device.  I can only take the V4L
> analogue device option and everything becomes very broken when I try and
> record a programme on the device.
>
> In essence the system tries to setup the NVR module to record a frame
> grabbibg
> operation but then falls apart when presented with an MPEG encoded stream.
>
> Is there some fundamental part of this puzzle I am overlooking that can
> make
> the MPEG encoder work in my environment or am I facing a point of time
> incompatability caused by feature misalignment in the V4L, V4L2, IVTV,
> Mythtv
> projects?
>
> Any thoughts would be appreciated
>

I believe you should be using the DVB interfaces in MythTV.  That uses the
same MPEG hardware encoder as video1 through the supported API that Myth is
looking for

Kevin
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