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No sound after channel change with Pinnacle PCTV USB2 tuner

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jsantossilva at hotmail

Nov 21, 2011, 6:06 PM

Post #1 of 13 (408 views)
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No sound after channel change with Pinnacle PCTV USB2 tuner

For the past couple of years I've been struggling to make the audio of
this system work *properly*.

This is the problem:
I hit Watch TV on the frontend and the channel shows up with sound; I
hit + and - and the OSD shows "Audio Track 1": perfect.
Then I hit up arrow to change channel; after a while, new channel shows
up but ***no sound***. I hit + or - and the OSD shows up *blank* (no
audio track 1)
If I escape and start Watch Tv, the cycle repeats every time.

These are the details:
Mythbuntu 11.04 fresh installed (many times)
Zotac Mag backend/frontend. Laptop frontend (same problem)
Pinnacle PCTV USB2 analog PAL tuner (I need analog; my cable provider
does digital encrypted (which I use in the living room with a STB) and
about 100 free analog channels which I want to send to another room via
wifi/myth, avoiding cable run and another STB)
Backend/V4L capture/sound: ALSA:hw:1,0 (default doesn't work)
TVtime works perfectly (audio/video) with this tuner

$lsusb #relevant...
Bus 001 Device 003: ID 2304:0208 Pinnacle Systems, Inc. Studio PCTV USB2

$arecord -l
card 0: NVidia [HDA NVidia], device 0: ALC888 Analog [ALC888 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: PALSECAM [PCTV USB2 PAL/SECAM], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0

$arecord -L #relevant
default:CARD=PALSECAM
PCTV USB2 PAL/SECAM, USB Audio
Default Audio Device
front:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
Front speakers
surround40:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
4.0 Surround output to Front and Rear speakers
surround41:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
Direct sample mixing device
dsnoop:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
Direct sample snooping device
hw:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
Direct hardware device without any conversions
plughw:CARD=PALSECAM,DEV=0
PCTV USB2 PAL/SECAM, USB Audio
Hardware device with all software conversions

dmesg | grep em28xx
[ 10.943665] em28xx: New device Pinnacle Systems GmbH PCTV USB2
PAL/SECAM @ 480 Mbps (2304:0208, interface 0, class 0)
[ 10.943890] em28xx #0: chip ID is em2820 (or em2710)
[ 11.074596] em28xx #0: i2c eeprom 00: 1a eb 67 95 04 23 08 02 10 00
1e 03 98 2a 6a 2e
...
[ 11.075011] em28xx #0: EEPROM ID= 0x9567eb1a, EEPROM hash = 0x5b54bee4
[ 11.075016] em28xx #0: EEPROM info:
[ 11.075020] em28xx #0: AC97 audio (5 sample rates)
[ 11.075024] em28xx #0: 500mA max power
[ 11.075029] em28xx #0: Table at 0x06, strings=0x2a98, 0x2e6a,
0x0000
[ 11.076198] em28xx #0: Identified as Pinnacle PCTV USB 2 (card=3)
[ 11.829092] saa7115 2-0025: saa7113 found (1f7113d0e100000) @ 0x4a
(em28xx #0)
[ 13.404850] em28xx #0: Config register raw data: 0x10
[ 13.428859] em28xx #0: AC97 vendor ID = 0xffffffff
[ 13.440855] em28xx #0: AC97 features = 0x6a90
[ 13.440865] em28xx #0: Empia 202 AC97 audio processor detected
[ 13.900071] em28xx #0: v4l2 driver version 0.1.2
[ 14.852242] em28xx #0: V4L2 video device registered as video0
[ 14.864136] em28xx audio device (2304:0208): interface 1, class 1
[ 14.864176] em28xx audio device (2304:0208): interface 2, class 1
[ 14.864308] usbcore: registered new interface driver em28xx
[ 14.864316] em28xx driver loaded

# watch channel 1022 with sound, change to 1019, sound stops, end watch.
$mythbackend -v audio,record,playback,extra
$cat /var/log/mythtv/mythbackend.log
...
2011-11-14 19:48:28.828 mythbackend version: fixes/0.24
[v0.24.1-80-g1de0431] www.mythtv.org
...
2011-11-14 22:45:52.773 TVRec(1): Changing from None to WatchingLiveTV
2011-11-14 22:45:52.828 TVRec(1): HW Tuner: 1->1
2011-11-14 22:45:53.078 LoadFromScheduler(): Error, called from backend.
2011-11-14 22:45:53.088 AutoExpire: CalcParams(): Max required Free
Space: 2.0 GB w/freq: 15 min
2011-11-14 22:45:53.944 Finished recording Unknown: channel 1022
2011-11-14 22:45:54.093 LoadFromScheduler(): Error, called from backend.
2011-11-14 22:45:54.107 AutoExpire: CalcParams(): Max required Free
Space: 2.0 GB w/freq: 15 min
2011-11-14 22:45:54.169 Finished recording Unknown: channel 1022
[mpeg4 @ 0x961e6d0] removing common factors from framerate
strange error flushing buffer ...
2011-11-14 22:45:56.004 RecBase(1:/dev/video0):
GetKeyframePositions(0,9223372036854775807,#1) out of 1
2011-11-14 22:45:56.189 RecBase(1:/dev/video0):
GetKeyframePositions(1,9223372036854775807,#0) out of 1
2011-11-14 22:46:14.134 TVRec(1): HW Tuner: 1->1
2011-11-14 22:46:14.229 LoadFromScheduler(): Error, called from backend.
2011-11-14 22:46:14.240 AutoExpire: CalcParams(): Max required Free
Space: 2.0 GB w/freq: 15 min
2011-11-14 22:46:14.306 Finished recording Unknown: channel 1022
2011-11-14 22:46:14.968 MainServer::ANN Monitor
2011-11-14 22:46:15.026 adding: golfinho as a client (events: 0)
2011-11-14 22:46:15.061 MainServer::ANN Monitor
2011-11-14 22:46:15.093 adding: golfinho as a client (events: 1)
2011-11-14 22:46:15.267 Finished recording Unknown: channel 1019
2011-11-14 22:46:15.301 LoadFromScheduler(): Error, called from backend.
2011-11-14 22:46:15.314 AutoExpire: CalcParams(): Max required Free
Space: 2.0 GB w/freq: 15 min

# doesn't help much with sound, does it? Just strange error... and
LoadFromScheduller()... (strange... errors aren't they?)

$mythfrontend -v audio,record,playback,extra
$cat /var/log/mythtv/mythfrontend.log #another similar situation but on
frontend
2011-11-14 23:08:32.152 Using protocol version 63
2011-11-14 23:11:10.015 TV: Attempting to change from None to WatchingLiveTV
2011-11-14 23:11:10.015 MythCoreContext: Connecting to backend server:
192.168.1.65:6543 (try 1 of 1)
2011-11-14 23:11:10.016 Using protocol version 63
2011-11-14 23:11:10.126 Spawning LiveTV Recorder -- begin
2011-11-14 23:11:11.196 Spawning LiveTV Recorder -- end
2011-11-14 23:11:11.213 We have a
playbackURL(/var/lib/mythtv/livetv/1020_20111114231110.nuv) &
cardtype(DUMMY)
2011-11-14 23:11:11.213 We have a RingBuffer
2011-11-14 23:11:11.989 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video
Texture'
2011-11-14 23:11:12.058 OSD: Base theme size: 800x600
2011-11-14 23:11:12.058 OSD: Scaling factors: 0.9x0.96
2011-11-14 23:11:12.156 OSD: Base theme size: 800x600
2011-11-14 23:11:12.156 OSD: Scaling factors: 0.9x0.96
2011-11-14 23:11:12.171 Player(0): Video timing method: USleep with busy
wait
2011-11-14 23:11:12.172 TV: Changing from None to WatchingLiveTV
2011-11-14 23:11:12.172 TV: State is LiveTV & mctx == ctx
2011-11-14 23:11:12.178 TV: UpdateOSDInput done
2011-11-14 23:11:12.178 TV: UpdateLCD done
2011-11-14 23:11:12.179 TV: ITVRestart done
2011-11-14 23:11:13.179 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video
Texture'
2011-11-14 23:11:13.540 AO: Opening audio device 'default' ch 2(2) sr
48000 sf signed 32 bit reenc 0
2011-11-14 23:11:13.548 ALSA, Error: Setting hardware audio buffer size
to 6016
2011-11-14 23:11:13.549 ALSA, Error: Error opening
/proc/asound/card0/pcm0p/sub0/prealloc: Permission denied.
2011-11-14 23:11:13.549 ALSA, Error: Try to manually increase audio
buffer with: echo 6016 | sudo tee /proc/asound/card0/pcm0p/sub0/prealloc
2011-11-14 23:11:13.549 ALSA, Error: Unable to sufficiently increase
ALSA hardware buffer size - underruns are likely
2011-11-14 23:11:13.564 AudioPlayer: Enabling Audio
2011-11-14 23:11:13.884 Player(0): Waited 100ms for video buffers
AAAAAAAAAAAAAAAAAAAAAAAAAAAAUuL
2011-11-14 23:11:13.892 Player(0): Waited 100ms for video buffers
AAAAAAAAAAAAAAAAAAAAAAAAAAAAUuL
2011-11-14 23:11:13.898 Player(0): Waited 100ms for video buffers
LAAAAAAAAAAAAAAAAAAAAAAAAAAAUUu
2011-11-14 23:11:14.028 VideoOutput: Created YV12 OSD.
2011-11-14 23:11:26.388 BrowseDispInfo()
2011-11-14 23:11:26.388 BrowseStart()
2011-11-14 23:11:26.410 browsechanid: 1020 -> 1021
2011-11-14 23:11:27.588 BrowseDispInfo()
2011-11-14 23:11:27.592 BrowseStart()
2011-11-14 23:11:27.612 browsechanid: 1021 -> 1022
2011-11-14 23:11:28.788 BrowseEnd()
2011-11-14 23:11:30.453
RingBuf(/var/lib/mythtv/livetv/1022_20111114231130.nuv) Warning: Not
starting read ahead thread, already running
2011-11-14 23:11:36.615 VDPAU: Version 1
2011-11-14 23:11:36.615 VDPAU: Information NVIDIA VDPAU Driver Shared
Library 280.13 Wed Jul 27 17:18:15 PDT 2011
2011-11-14 23:11:36.640 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video
Texture'
2011-11-14 23:11:36.707 AFD Warning: ScanATSCCaptionStreams() called
with no PMT
2011-11-14 23:11:36.707 AFD: Opened codec 0x9c418c0, id(MPEG4) type(Video)
2011-11-14 23:11:36.708 AudioPlayer: Disabling Audio, params(0,-1,-1)
2011-11-14 23:11:36.948 AudioPlayer: Disabling Audio, reason is:
Aborting Audio Reconfigure. Invalid audio parameters ch -1 fmt 0 @ -1Hz
2011-11-14 23:11:36.976 AFD: Resetting byte context eof (livetv 1 was eof 0)
2011-11-14 23:11:37.117 Player(0): Waited 100ms for video buffers
UUUUuLAAAAAAAAAAAAAAAAAAAAAAUUU
2011-11-14 23:11:37.123 Player(0): Waited 100ms for video buffers
UUUUUuLAAAAAAAAAAAAAAAAAAAAAUUU
2011-11-14 23:11:37.134 Player(0): Waited 100ms for video buffers
UUUUUUuLAAAAAAAAAAAAAAAAAAAAUUU
2011-11-14 23:11:37.140 Player(0): Waited 100ms for video buffers
UUUUUUUuLAAAAAAAAAAAAAAAAAAAUUU
2011-11-14 23:12:08.228 TV: Attempting to change from WatchingLiveTV to None
2011-11-14 23:12:08.658 TV: Changing from WatchingLiveTV to None

Concerning audio buffer reset error above, all /proc files are root
owned and not accessible by others or am I wrong? How is mythtv user,
not root group, supposed to be able to to write that file?

Anyway, I suspect the real problem is:

Aborting Audio Reconfigure. Invalid audio parameters ch -1 fmt 0 @ -1Hz

How did the parameters de-configure? They were right when we started
watching the first channel:

AO: Opening audio device 'default' ch 2(2) sr 48000 sf signed 32 bit reenc 0

Sorry for the long post, didn't find a shorter way to expose the matter.

Any help for a desperate user?
Rgds,
jss
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raymond at wagnerrp

Nov 21, 2011, 6:26 PM

Post #2 of 13 (384 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 11/21/2011 21:06, Jos� Silva wrote:
> For the past couple of years I've been struggling to make the audio of
> this system work *properly*.
>
> Pinnacle PCTV USB2 analog PAL tuner (I need analog; my cable provider
> does digital encrypted (which I use in the living room with a STB)

Replace capture device with MPEG encoder. See PVR-USB2 or HVR-1900.

http://linuxtv.org/wiki/index.php/Hauppauge_WinTV-PVR-USB2
http://linuxtv.org/wiki/index.php/Hauppauge_WinTV-HVR-1900
http://linuxtv.org/wiki/index.php/Pvrusb2

> and about 100 free analog channels which I want to send to another
> room via wifi/myth, avoiding cable run and another STB)

Run ethernet anyway. The wireless spectrum is only going to get more
crowded, and as eventually progress up from standard definition through
HD DVB-T to Bluray, and add additional frontends, you rapidly run out of
headroom.

> TVtime works perfectly (audio/video) with this tuner

TVTime really doesn't do much of anything with your tuner. The video
frames are copied out of the tuner capture buffer, and into the graphics
display buffer, with little to no manipulation. Audio is left up to the
system to pass through to the speakers. When you are instead trying to
capture and compress, MythTV is necessarily much more complicated. The
entire reason everyone recommends MPEG encoders for analog capture is to
completely bypass this complication.
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jsantossilva at hotmail

Nov 22, 2011, 4:28 PM

Post #3 of 13 (373 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 22-11-2011 02:26, Raymond Wagner wrote:
> On 11/21/2011 21:06, Jos� Silva wrote:
>> For the past couple of years I've been struggling to make the audio of
>> this system work *properly*.
>>
>> Pinnacle PCTV USB2 analog PAL tuner (I need analog; my cable provider
>> does digital encrypted (which I use in the living room with a STB)
>
> Replace capture device with MPEG encoder. See PVR-USB2 or HVR-1900.
>
> http://linuxtv.org/wiki/index.php/Hauppauge_WinTV-PVR-USB2
> http://linuxtv.org/wiki/index.php/Hauppauge_WinTV-HVR-1900
> http://linuxtv.org/wiki/index.php/Pvrusb2

Although I don't like to trash things that work (not with mythtv), I
just ordered a PVR-USB2; thank you for your advice.

Nonetheless, something still puzzles me: the MPEG chip encodes the
video, right?
But my problem is with audio, and not always. The proof that mythtv is
able to make it, is that it does every first time; and then the code
disobeys its mentor :)

> TVTime really doesn't do much of anything with your tuner. The video
> frames are copied out of the tuner capture buffer, and into the graphics
> display buffer, with little to no manipulation. Audio is left up to the
> system to pass through to the speakers. When you are instead trying to
> capture and compress, MythTV is necessarily much more complicated. The
> entire reason everyone recommends MPEG encoders for analog capture is to
> completely bypass this complication.

Again, it does it... every first time, although very complicated as you
explained.

Again, thank you for your help, I'm sure the new tuner will be much better.

keep well,
jss
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raymond at wagnerrp

Nov 22, 2011, 4:59 PM

Post #4 of 13 (373 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 11/22/2011 19:28, Jos� Silva wrote:
> Nonetheless, something still puzzles me: the MPEG chip encodes the
> video, right?
> But my problem is with audio, and not always. The proof that mythtv is
> able to make it, is that it does every first time; and then the code
> disobeys its mentor:)

Some encoder devices like the old Plextor recorders did only do video.
MythTV would have to independently capture, encode, and multiplex the
audio with an elementary video stream coming out of the device. The
IVTV devices like the PVR-USB2, and internal PVR-150 and HVR-1600, do
both audio and video. The encoder chip encodes to MPEG2 audio and
video, multiplexed into an MPEG program stream, which it outputs
straight out of the /dev/video0 device node. You can concatenate that
device into a file, and play it with any software than can handle MPEG
video.
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jsantossilva at hotmail

Nov 22, 2011, 5:36 PM

Post #5 of 13 (376 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 23-11-2011 00:59, Raymond Wagner wrote:
> On 11/22/2011 19:28, Jos� Silva wrote:
>> Nonetheless, something still puzzles me: the MPEG chip encodes the
>> video, right?
>> But my problem is with audio, and not always. The proof that mythtv is
>> able to make it, is that it does every first time; and then the code
>> disobeys its mentor:)
>
> Some encoder devices like the old Plextor recorders did only do video.
> MythTV would have to independently capture, encode, and multiplex the
> audio with an elementary video stream coming out of the device. The
> IVTV devices like the PVR-USB2, and internal PVR-150 and HVR-1600, do
> both audio and video. The encoder chip encodes to MPEG2 audio and
> video, multiplexed into an MPEG program stream, which it outputs
> straight out of the /dev/video0 device node. You can concatenate that
> device into a file, and play it with any software than can handle MPEG
> video.

I'm sorry to insist but I still don't understand that I need an encoder
chip to be able to have audio after the channel changes, because mythtv
didn't need it before the channel change, the audio was perfect, the
software encoding works as needed.

I'm sure your advice to change my tuner works. As much as trashing a car
with a flat tyre and buying a new one, but that's not what I asked for.

To make it clearer, if someone told me: "mythtv doesn't work with analog
tuners that don't have an encoder chip" (as tvheadend does), then I
would happily trash my tuner, or save it for tvtime.

But this is not the case, mythtv does work with my tuner, but only once
each time. And that's what I asked for help to solve, that is my question.

You can also say that this is a code glitch that isn't worth to look
because nobody uses those tuners these days; I accept that but then, I
think the dev should block the code in order to not let a good
application have dark alleys.

To finish, thank you again for the time you have spent with this issue
and please don't take me harsh, I hate to trash things.

keep well,
jss
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raymond at wagnerrp

Nov 22, 2011, 7:07 PM

Post #6 of 13 (370 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 11/22/2011 20:36, Jos� Silva wrote:
> To make it clearer, if someone told me: "mythtv doesn't work with analog
> tuners that don't have an encoder chip" (as tvheadend does), then I
> would happily trash my tuner, or save it for tvtime.
>
> But this is not the case, mythtv does work with my tuner, but only once
> each time. And that's what I asked for help to solve, that is my question.

MythTV does support framegrabber, but framegrabbers are designed to be
dirt cheap for direct playback only. MythTV can use them, and some
people still do. The problem is that there is going to be some amount
of manual configuration, and there are hundreds of devices using dozens
of different chipsets, all with varying degrees of support and decay.
Should you get into trouble, there are only going to be a handful of
people who are still experienced with these devices, and still an active
member of the community, that you could go to for help.

On the other hand, the IVTV cards require little to no configuration.
More so, they are a single, well supported, and well tread interface.
You can continue to try to get that analog tuner working, and you may
eventually be successful. Most people just consider it easier to use
hardware known to work well.
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mythtv at rtr

Feb 3, 2012, 7:20 AM

Post #7 of 13 (246 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 11-11-22 07:28 PM, José Silva wrote:
>
> Nonetheless, something still puzzles me: the MPEG chip encodes the
> video, right?

Audio _and_ video. It encodes both, combines them into a single mpeg stream,
and all that mythtv software needs to do is save the stream to a file.
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dheitmueller at kernellabs

Feb 3, 2012, 7:30 AM

Post #8 of 13 (245 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On Fri, Feb 3, 2012 at 10:20 AM, Mark Lord <mythtv [at] rtr> wrote:
> On 11-11-22 07:28 PM, Jos� Silva wrote:
>>
>> Nonetheless, something still puzzles me: the MPEG chip encodes the
>> video, right?
>
> Audio _and_ video. �It encodes both, combines them into a single mpeg stream,
> and all that mythtv software needs to do is save the stream to a file.

Exactly which model is this again? There are a variety of devices
which could be referred to as "Pinnacle PCTV USB2 tuner". Really what
I need is the model number (i.e. 70e, 73e, etc).

Also, does the audio continue to work properly after channel changes
when using tvtime? If so, that is definitely suspicious since it
suggests the driver is doing what it's supposed to (and I'm fairly
confident that tvtime follows the API spec in this regard since I help
maintain that codebase).

I'm just trying to narrow down whether this is a driver issue for this
device or some sort of API conformance problem within Myth.

Devin

--
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com
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mythtv at rtr

Feb 3, 2012, 8:21 AM

Post #9 of 13 (239 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 12-02-03 10:30 AM, Devin Heitmueller wrote:
> On Fri, Feb 3, 2012 at 10:20 AM, Mark Lord <mythtv [at] rtr> wrote:
>> On 11-11-22 07:28 PM, José Silva wrote:
>>>
>>> Nonetheless, something still puzzles me: the MPEG chip encodes the
>>> video, right?
>>
>> Audio _and_ video. It encodes both, combines them into a single mpeg stream,
>> and all that mythtv software needs to do is save the stream to a file.
>
> Exactly which model is this again? There are a variety of devices
> which could be referred to as "Pinnacle PCTV USB2 tuner". Really what
> I need is the model number (i.e. 70e, 73e, etc).

Good question for the original poster.
I was just answering to the question of what an "mpeg chip" does.

As far as analog tuners with built-in mpeg encoder chips,
I know of only one: Plextor ConvertX PX-TV402U.

And the drivers for that device are horribly out of date
and didn't work in Mythtv with kernels higher than the 2.6.2x series
(last time I tried it).

Excellent tuner, though, with h264/mpeg encoding etc.. all in hardware.
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mythtv at rtr

Feb 3, 2012, 8:24 AM

Post #10 of 13 (239 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 12-02-03 11:21 AM, Mark Lord wrote:
> On 12-02-03 10:30 AM, Devin Heitmueller wrote:
>> On Fri, Feb 3, 2012 at 10:20 AM, Mark Lord <mythtv [at] rtr> wrote:
>>> On 11-11-22 07:28 PM, José Silva wrote:
>>>>
>>>> Nonetheless, something still puzzles me: the MPEG chip encodes the
>>>> video, right?
>>>
>>> Audio _and_ video. It encodes both, combines them into a single mpeg stream,
>>> and all that mythtv software needs to do is save the stream to a file.
>>
>> Exactly which model is this again? There are a variety of devices
>> which could be referred to as "Pinnacle PCTV USB2 tuner". Really what
>> I need is the model number (i.e. 70e, 73e, etc).
>
> Good question for the original poster.
> I was just answering to the question of what an "mpeg chip" does.
>
> As far as analog tuners with built-in mpeg encoder chips,
> I know of only one: Plextor ConvertX PX-TV402U.
>
> And the drivers for that device are horribly out of date
> and didn't work in Mythtv with kernels higher than the 2.6.2x series
> (last time I tried it).
>
> Excellent tuner, though, with h264/mpeg encoding etc.. all in hardware.

Oh, and I suppose the (old) WinTV-PVR-USB2 thing also qualifies,
with full hardware encode built-in.
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dheitmueller at kernellabs

Feb 3, 2012, 8:31 AM

Post #11 of 13 (239 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On Fri, Feb 3, 2012 at 11:24 AM, Mark Lord <mythtv [at] rtr> wrote:
> Oh, and I suppose the (old) WinTV-PVR-USB2 thing also qualifies,
> with full hardware encode built-in.

Don't forget the HVR-1900/1950, which are both well supported and
currently sold products (which use the pvrusb2 driver).

Devin

--
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com
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raymond at wagnerrp

Feb 3, 2012, 9:25 AM

Post #12 of 13 (239 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 2/3/2012 11:21, Mark Lord wrote:
> On 12-02-03 10:30 AM, Devin Heitmueller wrote:
>> On Fri, Feb 3, 2012 at 10:20 AM, Mark Lord<mythtv [at] rtr> wrote:
>>> On 11-11-22 07:28 PM, José Silva wrote:
>>>> Nonetheless, something still puzzles me: the MPEG chip encodes the
>>>> video, right?
>>> Audio _and_ video. It encodes both, combines them into a single mpeg stream,
>>> and all that mythtv software needs to do is save the stream to a file.
> As far as analog tuners with built-in mpeg encoder chips,
> I know of only one: Plextor ConvertX PX-TV402U.

Technically, that specific device only encodes the video, leaving MythTV
to independently capture, compress, and multiplex in the audio.
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mythtv at rtr

Feb 3, 2012, 8:17 PM

Post #13 of 13 (233 views)
Permalink

Re: No sound after channel change with Pinnacle PCTV USB2 tuner [In reply to]

On 12-02-03 12:25 PM, Raymond Wagner wrote:
> On 2/3/2012 11:21, Mark Lord wrote:
>> On 12-02-03 10:30 AM, Devin Heitmueller wrote:
>>> On Fri, Feb 3, 2012 at 10:20 AM, Mark Lord<mythtv [at] rtr> wrote:
>>>> On 11-11-22 07:28 PM, José Silva wrote:
>>>>> Nonetheless, something still puzzles me: the MPEG chip encodes the
>>>>> video, right?
>>>> Audio _and_ video. It encodes both, combines them into a single mpeg stream,
>>>> and all that mythtv software needs to do is save the stream to a file.
>> As far as analog tuners with built-in mpeg encoder chips,
>> I know of only one: Plextor ConvertX PX-TV402U.
>
> Technically, that specific device only encodes the video, leaving MythTV
> to independently capture, compress, and multiplex in the audio.

No, that specific device has a full NTSC tuner,
and a full MPEG audio+video encoder chip.
It spits out a fully encoded mpeg file to /dev/videoX.

Cheers
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