[linux-dvb] How to stream DVB-S2 channels over network?

[linux-dvb] How to stream DVB-S2 channels over network?

[Artem Makhutov]

Hello,

I would like to stream a DVB-S2, H264 channel over my network to an STB.

I an using the TT 3200 DVB-S2 card with multiproto drivers from Igors repository.

So faar I have tried 3 different solutions:

1. Using szap2 & dvbstream

# szap2 -r -p 'ASTRA HD'
# dvbstream -udp -i 239.255.0.1 -r 1234

2. Using szap2 and VLC

# szap2 -r -p 'ASTRA HD'
and setup VLC using the GUI to read from
/dev/dvb/adapter0/dvr0 and stream to 239.255.0.1

3. Use Windows with ProgDVB and stream to 239.255.0.1

Basically only the solution using Windows is working.

The streams from linux are all broken.
The video and audio stops every 5 seconds for 1 second.

So I can imagine 2 scenarios:

1. The stb0899 driver is broken and is producing a bad stream
2. The network streaming of VLC and dvbstream is broken

Do you know any other methods to stream a DVB-S2 channel over network?

Thanks, Artem

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[BOUWSMA Barry]

On Sat, 20 Dec 2008, Artem Makhutov wrote:

> 1. The stb0899 driver is broken and is producing a bad stream
> 2. The network streaming of VLC and dvbstream is broken

Use the `-o:' option of `dvbstream' to write to a file,
then see if this file is corrupted or damaged.  If this
is so, then case 1 above would be correct.


> Do you know any other methods to stream a DVB-S2 channel over network?

There's no difference between a DVB-S2 channel and any
other source of 188-byte Transport Stream packets, be
they video, radio, data, or whatever.

I've used `dvbstream' in the past to stream multicast
data; the problem I had was in the limited support of
the players I was using to handle the stream properly.
I also think I may have had to hack `dvbstream' slightly
to properly support and tag the payloads, though I may
be mis-remembering.

At the moment I'm using `dvbstream' to stdout, then
piping that to extract the audio payload of interest,
which I then pipe to a different streaming program that
performs better for a simple audio stream without the
excess overhead of the TS, and it's working well.

The only problem I've had has been the interaction with
the various hardware I use on the purity of the stream
-- if the USB ethernet is connected one way, it causes
the stream from the DVB receiver to be corrupted, and
if the receiver is connected through a particular USB
hub, its stream is again corrupted occasionally.  It is
all very annoying when I forget, and confusing to try
and track down these imperfections -- for example, I've
now determined that a particular external USB->HDD
adapter cannot be connected directly to my EHCI card,
nor to the first hub, but seems fine when a second hub
is connected to the first, then the disk to that
daisy-chain.  And on another machine, the two EHCI USB
ports don't work at all, while working wonderfully with
NetBSD.

That off-topic rambling was to note that problems often
may be caused by seemingly unrelated things for reasons
which I cannot understand, not being intimate with the
kernel internals or how hardware works.

Back on-topic, I have used `dvbstream' to multicast TS
of radio and video, tuning directly with it (i.e., no
`szap' needed) with no real problems, though it is the
standard `dvbtools' version that I've undoubtedly hacked.

barry bouwsma

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[hermann pitton]

Am Sonntag, den 21.12.2008, 03:29 +0100 schrieb BOUWSMA Barry:
> On Sat, 20 Dec 2008, Artem Makhutov wrote:
> 
> > 1. The stb0899 driver is broken and is producing a bad stream
> > 2. The network streaming of VLC and dvbstream is broken
> 
> Use the `-o:' option of `dvbstream' to write to a file,
> then see if this file is corrupted or damaged.  If this
> is so, then case 1 above would be correct.
> 
> 
> > Do you know any other methods to stream a DVB-S2 channel over network?
> 
> There's no difference between a DVB-S2 channel and any
> other source of 188-byte Transport Stream packets, be
> they video, radio, data, or whatever.
> 
> I've used `dvbstream' in the past to stream multicast
> data; the problem I had was in the limited support of
> the players I was using to handle the stream properly.
> I also think I may have had to hack `dvbstream' slightly
> to properly support and tag the payloads, though I may
> be mis-remembering.
> 
> At the moment I'm using `dvbstream' to stdout, then
> piping that to extract the audio payload of interest,
> which I then pipe to a different streaming program that
> performs better for a simple audio stream without the
> excess overhead of the TS, and it's working well.
> 
> The only problem I've had has been the interaction with
> the various hardware I use on the purity of the stream
> -- if the USB ethernet is connected one way, it causes
> the stream from the DVB receiver to be corrupted, and
> if the receiver is connected through a particular USB
> hub, its stream is again corrupted occasionally.  It is
> all very annoying when I forget, and confusing to try
> and track down these imperfections -- for example, I've
> now determined that a particular external USB->HDD
> adapter cannot be connected directly to my EHCI card,
> nor to the first hub, but seems fine when a second hub
> is connected to the first, then the disk to that
> daisy-chain.  And on another machine, the two EHCI USB
> ports don't work at all, while working wonderfully with
> NetBSD.
> 
> That off-topic rambling was to note that problems often
> may be caused by seemingly unrelated things for reasons
> which I cannot understand, not being intimate with the
> kernel internals or how hardware works.
> 
> Back on-topic, I have used `dvbstream' to multicast TS
> of radio and video, tuning directly with it (i.e., no
> `szap' needed) with no real problems, though it is the
> standard `dvbtools' version that I've undoubtedly hacked.
> 
> barry bouwsma
> 

Hi,

I must admit that I did not read it all yet this time.

But a good probe might be to save the HD S2 stuff to a file and then try
to get it over a nfs mount with xine for example on other PCs.

On consumer level it only has advantages, skip the commercials ...

This works since stoneage within local networks.

If you are trying to get it out over the internet, it might cause some
more questions of course.

Cheers,
Hermann









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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Michel Verbraak]

Artem Makhutov schreef:
> Hello,
>
> I would like to stream a DVB-S2, H264 channel over my network to an STB.
>
> I an using the TT 3200 DVB-S2 card with multiproto drivers from Igors repository.
>
> So faar I have tried 3 different solutions:
>
> 1. Using szap2 & dvbstream
>
> # szap2 -r -p 'ASTRA HD'
> # dvbstream -udp -i 239.255.0.1 -r 1234
>
> 2. Using szap2 and VLC
>
> # szap2 -r -p 'ASTRA HD'
> and setup VLC using the GUI to read from
> /dev/dvb/adapter0/dvr0 and stream to 239.255.0.1
>
> 3. Use Windows with ProgDVB and stream to 239.255.0.1
>
> Basically only the solution using Windows is working.
>
> The streams from linux are all broken.
> The video and audio stops every 5 seconds for 1 second.
>
> So I can imagine 2 scenarios:
>
> 1. The stb0899 driver is broken and is producing a bad stream
> 2. The network streaming of VLC and dvbstream is broken
>
> Do you know any other methods to stream a DVB-S2 channel over network?
>
> Thanks, Artem
>
> _______________________________________________
> linux-dvb mailing list
> linux-dvb@linuxtv.org
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>   
Artem,

Have a look at my tvpump program which is part of my set of programs I 
use to view livetv (http://www.verbraak.org/wiki/index.php/TVSuite).
I use ffplay to view HD content but I currently also have problems 
viewing HD content because my computer for viewing is a bit to slow.

Regards,

Michel.

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Artem Makhutov]

Hi,

On Sun, Dec 21, 2008 at 02:15:34PM +0100, Michel Verbraak wrote:
> Have a look at my tvpump program which is part of my set of programs I  
> use to view livetv (http://www.verbraak.org/wiki/index.php/TVSuite).
> I use ffplay to view HD content but I currently also have problems  
> viewing HD content because my computer for viewing is a bit to slow.

I just checked it out. It looks interesing, but I need UDP streaming,
as the STB can only receive UDP-Streams.

Maybe I can stream to UDP  by connecting to it using nc and the pipe the
output an other nc, which will output to UDP.

Regards, Artem

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Artem Makhutov]

Hi,

On Sun, Dec 21, 2008 at 01:46:48AM +0100, Faruk A wrote:
> The best streaming method in linux that i found is vdr with streamdev plugin.

Yes, I know :) And I am trying to help with the UDP multicast streaming.

> try streaming the whole transponder with 8192.
> szap2 -r -p 'ASTRA HD'
> dvbstream 8192 -udp -i 239.255.0.1 -r 1234

Yes, the stream is still corrupted.

> vlc 0.8??: you can change the channel in the "Navigation" sub menu.
> vlc 09??:  I think they change the location, I can't help you with
> that since my locale is in Swedish.

I can not use the build in DVB-Tuning of VLC because it does not support multiproto
and therefore can not tune to DVB-S2 channels.

Regards, Artem

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Artem Makhutov]

Hi,

On Sun, Dec 21, 2008 at 03:44:33AM +0100, hermann pitton wrote:
> I must admit that I did not read it all yet this time.
> 
> But a good probe might be to save the HD S2 stuff to a file and then try
> to get it over a nfs mount with xine for example on other PCs.
> 
> On consumer level it only has advantages, skip the commercials ...
> 
> This works since stoneage within local networks.
> 
> If you are trying to get it out over the internet, it might cause some
> more questions of course.

The STB can only playpack UDP Streams, so NFS will not help me much.

I have recorded the stream to a file and will try to playback it under windows.
My CPU is too slow to playback the stream without GPU acceleration under linux.

Regards, Artem

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Artem Makhutov]

Hi,

On Sun, Dec 21, 2008 at 03:29:45AM +0100, BOUWSMA Barry wrote:
> On Sat, 20 Dec 2008, Artem Makhutov wrote:
> 
> > 1. The stb0899 driver is broken and is producing a bad stream
> > 2. The network streaming of VLC and dvbstream is broken
> 
> Use the `-o:' option of `dvbstream' to write to a file,
> then see if this file is corrupted or damaged.  If this
> is so, then case 1 above would be correct.
> 
> 
> > Do you know any other methods to stream a DVB-S2 channel over network?
> 
> There's no difference between a DVB-S2 channel and any
> other source of 188-byte Transport Stream packets, be
> they video, radio, data, or whatever.
> 
> I've used `dvbstream' in the past to stream multicast
> data; the problem I had was in the limited support of
> the players I was using to handle the stream properly.
> I also think I may have had to hack `dvbstream' slightly
> to properly support and tag the payloads, though I may
> be mis-remembering.
> 
> At the moment I'm using `dvbstream' to stdout, then
> piping that to extract the audio payload of interest,
> which I then pipe to a different streaming program that
> performs better for a simple audio stream without the
> excess overhead of the TS, and it's working well.
> 
> The only problem I've had has been the interaction with
> the various hardware I use on the purity of the stream
> -- if the USB ethernet is connected one way, it causes
> the stream from the DVB receiver to be corrupted, and
> if the receiver is connected through a particular USB
> hub, its stream is again corrupted occasionally.  It is
> all very annoying when I forget, and confusing to try
> and track down these imperfections -- for example, I've
> now determined that a particular external USB->HDD
> adapter cannot be connected directly to my EHCI card,
> nor to the first hub, but seems fine when a second hub
> is connected to the first, then the disk to that
> daisy-chain.  And on another machine, the two EHCI USB
> ports don't work at all, while working wonderfully with
> NetBSD.
> 
> That off-topic rambling was to note that problems often
> may be caused by seemingly unrelated things for reasons
> which I cannot understand, not being intimate with the
> kernel internals or how hardware works.
> 
> Back on-topic, I have used `dvbstream' to multicast TS
> of radio and video, tuning directly with it (i.e., no
> `szap' needed) with no real problems, though it is the
> standard `dvbtools' version that I've undoubtedly hacked.

Everything looks like my SkyStar HD/TT-3200 is producing a little bit
currupt stream for DVB-S2 under linux. DVB-S looks prette good.
I will try to playback the recorded stream under Windows
today afternoon.

Thanks and Regards, Artem

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[BOUWSMA Barry]

On Sun, 21 Dec 2008, Artem Makhutov wrote:

> I just checked it out. It looks interesing, but I need UDP streaming,
> as the STB can only receive UDP-Streams.

What sort of UDP do you need -- an RTP Transport Stream,
an RTP Program Stream, a simple raw Transport stream, or
what?

Unless you're using a different `dvbstream' than I, it
sends out RTP (partial or not) Transport Streams, with
UDP packet size equal to the TS frame size (I hacked this
to fill as much of an ethernet frame as possible).

I don't know if your `szap2' program simply sets up the
frontend to the desired frequency, or if it also sets
hardware PID filters on your card -- I've always been able
to use other utilities with bog-standard `t/szap' to work
on the entire TS.

If bandwidth is an issue, a HD H.264 stream is likely to
weigh in around 10 to 20Mbit/sec; a full S2 transport
stream is higher (DVB-S streams from Astra are on the
order of 36Mbit/sec; S2 will likely be slightly more).

Add the overhead for UDP encapsulation of the 188-byte
packets, and I wouldn't be surprised if you push close
to some hardware limits of a 100Mbit/sec network, given
the unreliable nature of UDP, and that a single dropped
or corrupt packet can appear as a video stream error.

Although, as you said, your 'Doze works, so the sum of
your hardware should be able to handle the traffic.

Something I just learned a few seconds ago, dvbstream:
-net ip:prt IP address:port combination to be followed by pids 
list. Can be repeated to generate multiple RTP streams

This will filter your ~50Mbit/sec transponder down to a
manageable size.  Be sure to specify all the PIDs for
ASTRA HD or whatever; for the DVB-S Eins Festival that
will start tomorrow (Mo) with non-upscaled 720p content
again, that should be
0  1600  -v 1601   -a 1602   1603  1606
(as arguments to standalone `dvbstream')


Just some additional things to keep in mind...


By the way, I also received some personal mail which I
don't think made it to the list, and this may be of use
to you, so I'll quote from that here, so that others may
benefit:
DUBOST Brice wrote:
``You can try mumudvb : http://mumudvb.braice.net, I think it will answer
your needs''


thankz
baz bouwsma

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[BOUWSMA Barry]

On Sun, 21 Dec 2008, Artem Makhutov wrote:

> I have recorded the stream to a file and will try to playback it under windows.
> My CPU is too slow to playback the stream without GPU acceleration under linux.

A common occurrence, I say, fondling my beloved 200MHz
production machine that records four streams flawlessly
(save for two devices being USB1 and thus only good for
radio or selected TV clamped to a maximum bitrate, for
now)


I pass all my recordings through a two-pass process to
check for problems (for radio, obviously just one pass)

I have a script that extracts the audio payload using a
hack to `dvb_mpegtools' and passes it to `mpg123'.  The
`dvb_mpegtools' serves to check the integrity of the
Transport Stream (usually when bad weather affects my
satellite reception, or when my DVB-T receiving antenna
is placed in a poor location); `mpg123 -v -t' zips through
the file and spits out any corrupted audio frames.

(The version of mpg123 I use doesn't seem to do anything
with the CRC when used, and it gets confused when the
CRC is toggled during a stream, which has happened a few
times during recordings I've made.  That's something
which I should work on, because I have a few recordings
with audible blorps that pass the `mpg123' test, probably
due to flipped bits in the payload rather than dropped
data.)


Then I use `mplayer' to check the video, using the
options `-nosound -vo null' and in the case of MPEG-2
video, `-vc ffmpeg12'.  This will spit out errors due
to corruption of the video data -- though you need to
hack in some newlines if you want to actually see the
PTS timestamp where the error(s) occurred.

For H.264 video, there is no alternative to `-vc ffh264'
that I know of, but it will similarly spew out errors
if there's damage to your source.

Sure, it takes my machines more than a day to chew through
an hour of H.264 1080i video, but I know whether I need
to re-record the programme later to get a clean file that
I can watch in some ten years when people throw away the
gamer machines of today.  Yeah, I'm cheap.  What of it?


That's a lot easier than suffering eyestrain watching a
screen for some scarcely-visible corruption, which I
used to do long ago...


barry bouwsma
stingy scrooge

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[BOUWSMA Barry]

On Sun, 21 Dec 2008, Artem Makhutov wrote:

> > Use the `-o:' option of `dvbstream' to write to a file,
> > then see if this file is corrupted or damaged.  If this
> > is so, then case 1 above would be correct.

> Everything looks like my SkyStar HD/TT-3200 is producing a little bit
> currupt stream for DVB-S2 under linux. DVB-S looks prette good.
> I will try to playback the recorded stream under Windows
> today afternoon.

Hi, me again :-)  Sorry to be writing so much today...

I actually do not know if you are receiving ASTRA HD from
19E2, or from elsewhere, and I now realize that earlier,
I assumed that you did...

As I noted in my last mail, please try `mplayer -vo null
etc.' to detect corrupted video.  The `-nosound' option
means that every frame will be checked, no matter how
slow my^H^H your machine.

In case the bandwidth is of concern, because I do not
know what to expect from HD DVB-S2 transponders...

I'm assuming, from your headers, you're somewhere in
germany -- if you are within the Astra 2D footprint at
28E2, meaning, the west or northwest, you can receive
the BBC-HD signal with a reasonable dish -- this will
fill about 7 to 8GB per hour on disk, and is sent via
DVB-S at present.  Around Berlin, you'll need perhaps a
2 metre dish.  If you can tune it, this will give a DVB-S 
reference at a decent bitrate, probably similar to ASTRA
HD.

Alternatively, on DVB-S, Eins Festival HD starts in less
than 24 hours; the bitrate is not so high -- I have some
files from the past Easter holiday that require, for
example, 21GB from somtime after 13h to just after 17h,
so a bit better than good quality SD video, but slightly
less than the BBC-HD stream.  Both these are H.264.

With a few hours of suitable HD recording, you can then
definitively say, oh yeah, the -S2 transport streams are
indeed corrupt and the -S streams perfect, or not, or
something.  That would be very useful, if it isn't
already widely known.


thnks,
barry bouwsma

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[hermann pitton]

Hi,

Am Sonntag, den 21.12.2008, 14:59 +0100 schrieb Artem Makhutov:
> Hi,
> 
> On Sun, Dec 21, 2008 at 03:44:33AM +0100, hermann pitton wrote:
> > I must admit that I did not read it all yet this time.
> > 
> > But a good probe might be to save the HD S2 stuff to a file and then try
> > to get it over a nfs mount with xine for example on other PCs.
> > 
> > On consumer level it only has advantages, skip the commercials ...
> > 
> > This works since stoneage within local networks.
> > 
> > If you are trying to get it out over the internet, it might cause some
> > more questions of course.
> 
> The STB can only playpack UDP Streams, so NFS will not help me much.

should have read better.

> I have recorded the stream to a file and will try to playback it under windows.
> My CPU is too slow to playback the stream without GPU acceleration under linux.
> 

The pDVD with GPU acceleration plays my Linux recorded BBC HD 1080i
stuff without any visible issues. So that should work in any case at
first I guess. (all on saa7134 DVB-S stuff)

I recently tried libxine with vdpau support, but on Linux recorded 1080i
BBC HD stuff it shows only a grey surface. The same recorded under
windows it plays already fine, but it often needs several attempts to
get playback started and it does not like seeking. It also doesn't like
my channels.conf yet, but I don't expect it to do any better on live
watching for now.

The recent mplayer vdpau patches do work fine for playback of all
recorded 1080i stuff and mpeg2 sound is without any sync issues.
It is only a simple 9500GT here, but the GPU stays totally cool and no
fan turns on like some supposed. 

The only issue left are some flashing green and purple blocks at the
bottom line, but others seem not to have it and it might be related to
the current implementation of that video card.

Unfortunately on vdpau live watching mplayer loses A/V sync like it does
with -vo xv even for playback only. That works mostly fine with kaffeine
xv against that libxine as long it stays with mpeg2 audio, but really
safe is only to playback from recordings, since they fumble around with
audio and that sort of AC3 they have seems not to be for me yet.
CPUs are of course at 30% on the amd quad with xv and ffmpeg h264 then.

Cheers,
Hermann



 




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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Artem Makhutov]

Hello,

BOUWSMA Barry schrieb:
> On Sun, 21 Dec 2008, Artem Makhutov wrote:
> 
>> I just checked it out. It looks interesing, but I need UDP streaming,
>> as the STB can only receive UDP-Streams.
> 
> What sort of UDP do you need -- an RTP Transport Stream,
> an RTP Program Stream, a simple raw Transport stream, or
> what?

It needs a raw MPEG-TS encapsulated in UDP packets.

> Unless you're using a different `dvbstream' than I, it
> sends out RTP (partial or not) Transport Streams, with
> UDP packet size equal to the TS frame size (I hacked this
> to fill as much of an ethernet frame as possible).
> 
> I don't know if your `szap2' program simply sets up the
> frontend to the desired frequency, or if it also sets
> hardware PID filters on your card -- I've always been able
> to use other utilities with bog-standard `t/szap' to work
> on the entire TS.

It also sets the PID's.

> If bandwidth is an issue, a HD H.264 stream is likely to
> weigh in around 10 to 20Mbit/sec; a full S2 transport
> stream is higher (DVB-S streams from Astra are on the
> order of 36Mbit/sec; S2 will likely be slightly more).

No, bandwith is not an issue. I have a peak traffic of 20.51 MBit/s and
an average traffic of 13.24 MBit/s.

> Add the overhead for UDP encapsulation of the 188-byte
> packets, and I wouldn't be surprised if you push close
> to some hardware limits of a 100Mbit/sec network, given
> the unreliable nature of UDP, and that a single dropped
> or corrupt packet can appear as a video stream error.
> 
> Although, as you said, your 'Doze works, so the sum of
> your hardware should be able to handle the traffic.
> 
> Something I just learned a few seconds ago, dvbstream:
> -net ip:prt IP address:port combination to be followed by pids 
> list. Can be repeated to generate multiple RTP streams
> 
> This will filter your ~50Mbit/sec transponder down to a
> manageable size.  Be sure to specify all the PIDs for
> ASTRA HD or whatever; for the DVB-S Eins Festival that
> will start tomorrow (Mo) with non-upscaled 720p content
> again, that should be
> 0  1600  -v 1601   -a 1602   1603  1606
> (as arguments to standalone `dvbstream')
> 
> 
> Just some additional things to keep in mind...
> 
> 
> By the way, I also received some personal mail which I
> don't think made it to the list, and this may be of use
> to you, so I'll quote from that here, so that others may
> benefit:
> DUBOST Brice wrote:
> ``You can try mumudvb : http://mumudvb.braice.net, I think it will answer
> your needs''

I will give it a try later.

Thanks, Artem


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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Artem Makhutov]

Hi,

BOUWSMA Barry schrieb:
> On Sun, 21 Dec 2008, Artem Makhutov wrote:
> 
>>> Use the `-o:' option of `dvbstream' to write to a file,
>>> then see if this file is corrupted or damaged.  If this
>>> is so, then case 1 above would be correct.
> 
>> Everything looks like my SkyStar HD/TT-3200 is producing a little bit
>> currupt stream for DVB-S2 under linux. DVB-S looks prette good.
>> I will try to playback the recorded stream under Windows
>> today afternoon.
> 
> Hi, me again :-)  Sorry to be writing so much today...

No problem :)

> I actually do not know if you are receiving ASTRA HD from
> 19E2, or from elsewhere, and I now realize that earlier,
> I assumed that you did...

My dish is pointing to Astra 19.2E.

> As I noted in my last mail, please try `mplayer -vo null
> etc.' to detect corrupted video.  The `-nosound' option
> means that every frame will be checked, no matter how
> slow my^H^H your machine.
> 
> In case the bandwidth is of concern, because I do not
> know what to expect from HD DVB-S2 transponders...
> 
> I'm assuming, from your headers, you're somewhere in
> germany -- if you are within the Astra 2D footprint at
> 28E2, meaning, the west or northwest, you can receive
> the BBC-HD signal with a reasonable dish -- this will
> fill about 7 to 8GB per hour on disk, and is sent via
> DVB-S at present.  Around Berlin, you'll need perhaps a
> 2 metre dish.  If you can tune it, this will give a DVB-S 
> reference at a decent bitrate, probably similar to ASTRA
> HD.
> 
> Alternatively, on DVB-S, Eins Festival HD starts in less
> than 24 hours; the bitrate is not so high -- I have some
> files from the past Easter holiday that require, for
> example, 21GB from somtime after 13h to just after 17h,
> so a bit better than good quality SD video, but slightly
> less than the BBC-HD stream.  Both these are H.264.
> 
> With a few hours of suitable HD recording, you can then
> definitively say, oh yeah, the -S2 transport streams are
> indeed corrupt and the -S streams perfect, or not, or
> something.  That would be very useful, if it isn't
> already widely known.

Yes, I will try it out today.

Regards, Artem

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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Artem Makhutov]

Hi,

BOUWSMA Barry schrieb:
> On Sun, 21 Dec 2008, Artem Makhutov wrote:
> 
>> I have recorded the stream to a file and will try to playback it under windows.
>> My CPU is too slow to playback the stream without GPU acceleration under linux.
> 
> A common occurrence, I say, fondling my beloved 200MHz
> production machine that records four streams flawlessly
> (save for two devices being USB1 and thus only good for
> radio or selected TV clamped to a maximum bitrate, for
> now)
> 
> 
> I pass all my recordings through a two-pass process to
> check for problems (for radio, obviously just one pass)
> 
> I have a script that extracts the audio payload using a
> hack to `dvb_mpegtools' and passes it to `mpg123'.  The
> `dvb_mpegtools' serves to check the integrity of the
> Transport Stream (usually when bad weather affects my
> satellite reception, or when my DVB-T receiving antenna
> is placed in a poor location); `mpg123 -v -t' zips through
> the file and spits out any corrupted audio frames.
> 
> (The version of mpg123 I use doesn't seem to do anything
> with the CRC when used, and it gets confused when the
> CRC is toggled during a stream, which has happened a few
> times during recordings I've made.  That's something
> which I should work on, because I have a few recordings
> with audible blorps that pass the `mpg123' test, probably
> due to flipped bits in the payload rather than dropped
> data.)
> 
> 
> Then I use `mplayer' to check the video, using the
> options `-nosound -vo null' and in the case of MPEG-2
> video, `-vc ffmpeg12'.  This will spit out errors due
> to corruption of the video data -- though you need to
> hack in some newlines if you want to actually see the
> PTS timestamp where the error(s) occurred.
> 
> For H.264 video, there is no alternative to `-vc ffh264'
> that I know of, but it will similarly spew out errors
> if there's damage to your source.
> 
> Sure, it takes my machines more than a day to chew through
> an hour of H.264 1080i video, but I know whether I need
> to re-record the programme later to get a clean file that
> I can watch in some ten years when people throw away the
> gamer machines of today.  Yeah, I'm cheap.  What of it?
> 
> 
> That's a lot easier than suffering eyestrain watching a
> screen for some scarcely-visible corruption, which I
> used to do long ago...

Thats interesting. Thanks.

I have replayed the recorded video file on Windows and I saw some
artifacts in the stream. So the stream is corrupted.

Today I have also replaced my 60cm dish with a 80cm one.

Now I have much less curruptions in the stream.

The most interesting thing is, that I had absolutly no corruptions in
the stream under windows with the 60cm dish, and under Linux I still
have some corruptions with the 80cm dish.

So the reception is much better with windows then with linux...

Regards, Artem




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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Nico Sabbi]

Il giorno dom, 21/12/2008 alle 15.16 +0100, BOUWSMA Barry ha scritto:
> On Sun, 21 Dec 2008, Artem Makhutov wrote:
> 
> > I just checked it out. It looks interesing, but I need UDP streaming,
> > as the STB can only receive UDP-Streams.
> 
> What sort of UDP do you need -- an RTP Transport Stream,
> an RTP Program Stream, a simple raw Transport stream, or
> what?
> 
> Unless you're using a different `dvbstream' than I, it
> sends out RTP (partial or not) Transport Streams, with
> UDP packet size equal to the TS frame size (I hacked this
> to fill as much of an ethernet frame as possible).

-udp sends plain UDP packets with ~1500 bytes of payload




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Re: [linux-dvb] How to stream DVB-S2 channels over network?

[Brice DUBOST]

Artem Makhutov a écrit :
> Hello,
> 
> I would like to stream a DVB-S2, H264 channel over my network to an STB.
> 
> I an using the TT 3200 DVB-S2 card with multiproto drivers from Igors repository.
> 
> So faar I have tried 3 different solutions:
> 
> [...]
>
> Do you know any other methods to stream a DVB-S2 channel over network?
> 

Hello

You can try to use mumudvb (http://mumudvb.braice.net)

In order to stream dvb-s2 I've implemented an option dont_tune in
mumudvb wich permit to skip the tuning part of mumudvb wich is "old gen".

The solution of using this option and tuning the card before launching
mumudvb have been reported to work with dvb-s2

To get the snapshot with this option, follow this link
http://gitweb.braice.net/gitweb?p=mumudvb.git;a=snapshot;h=f430989cbe696345872b6ccf66d30e57a8bd8abc

Best regards,

-- 
Brice


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