- September 1, 2008
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[Bug] TV: missing audio stream in records (Sky) (2 Viewers)
- Thread starter Brette
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- July 25, 2010
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@mm1352000
I had a talk with Norbert and here is our conversation (translation follows below) and I censored our Names
Also I should say "best regrads" from Norbert, too!
Like I wrote above: If you have any additional questions/inputs please let me know. I will take care of it
I had a talk with Norbert and here is our conversation (translation follows below) and I censored our Names
Also I should say "best regrads" from Norbert, too!
Translation:[11:08:44] FreakyJ: Hi Norbert
[11:08:56] FreakyJ: wir glauben einen kleinen Fehler in eurem Treiber gefunden zu haben.
[11:08:58] Norbert: Moin
[11:09:08] FreakyJ: Ersteinmal soll ich dir liebe Grüße von mm sagen!
[11:09:58] FreakyJ: Es handelt sich darum, dass wenn man in Sky einen Sender aufnimmt und während der Prerecording zeit nur eine Tonspur verfügbar war, der Film aber mehr als eine Tonspur hat die anderen Tonspuren verschlüsselt bleiben
[11:10:12] FreakyJ: Hier die Nachricht von mm, welche mehr technische Details enthält:
[11:10:19] FreakyJ: ello Norbert, Manfred
Recently a bug that affects Digital Devices hardware was reported on our forums. It relates to handling of dynamic PMT changes for encrypted channels.
When I say "dynamic PMT changes" I mean: changes to the number or type of video, audio, subtitles or teletext streams, some time after a channel has been tuned.
When TV Server detects a PMT change, it asks the CI/CAM to decrypt the channel again. For Digital Devices, we use the KSPROPERTY_DD_DECRYPT_PROGRAM property. It seems that the current Digital Devices driver ignores this request, maybe because it thinks that the CI/CAM is already decrypting the channel. The effect is that any new streams remain encrypted.
Could you please investigate. Please don't hesitate to ask if you have any questions.
Best regards,
[11:12:50] Norbert: danke, grüße Zurück
[11:12:57] FreakyJ: werde ich ausrichten
[11:13:03] FreakyJ: könnt ihr damit was anfangen?
[11:13:24] Norbert: das ist kein Bug, sondern eine Einschränkung, die bei MTD nicht anders geht
[11:13:35] Norbert: bei single Transponder Mode geht es
[11:14:46] Norbert: ich weiß das Sky gerne mal nachträglich Audiospuren dazu schaltet, nur wir müssen ja eonen neuen Transponder mischen und die Elementray Streams zusamen bauen, die beim Tunen bekannt sind,
[11:15:20] Norbert: das ist nicht anderes realiesierbar bei MTD
[11:16:06] FreakyJ: Wenn du das sagst, wird es wohl so sein
[11:16:08] FreakyJ: *und
[12:00:58] Norbert: wenn man das CI im Config Tool nur einem Tuner zuweist, ist es single Transponder, das heißt, der gesammte Transponderwird über das CI geschickt
[12:01:50] Norbert: wenn man mehr als einen Tuner dem CI zuweist ist automatisch MTD eingestellt, heißt aus den gewählten TV Programmen wird ein neuer Transponder gemischt und dem CI gescickt.
[12:27:03] FreakyJ: Danke dir
[12:27:27] FreakyJ: Ist es okay, wenn ich die Konversation bei uns im Forum + englische Übersetzung für mm poste?
[12:27:45] Norbert: klar
[12:27:52] FreakyJ: danke dir
[12:28:01] FreakyJ: Falls mm noch fragen hat, dann schreibe ich dir einfach nochmal^^
[12:28:54] Norbert: das Thema hatte ich schon, deswegen konnte ich das sofort beantworten, weil ich das schon mit dem Entwickler diskutiert hatte
[12:29:11] FreakyJ: hehe, ich war auch überrascht, dass die Antwort so promt kam .D
[12:29:12] FreakyJ:
[11:08:44] FreakyJ: Hi Norbert
[11:08:56] FreakyJ: we think that we maybe found a bug in your drivers
[11:08:58] Norbert: Moin
[11:09:08] FreakyJ: But first of all kind regards from mm
[11:09:58] FreakyJ: The problem is that if you record a program in which is only one audio stream during the pre recording time and more than audio stream later in the recording the new added audio streams stay encrypted
[11:10:12] FreakyJ: Here is the message from mm, with the technical details:
[11:10:19] FreakyJ: Hello Norbert, Manfred
Recently a bug that affects Digital Devices hardware was reported on our forums. It relates to handling of dynamic PMT changes for encrypted channels.
When I say "dynamic PMT changes" I mean: changes to the number or type of video, audio, subtitles or teletext streams, some time after a channel has been tuned.
When TV Server detects a PMT change, it asks the CI/CAM to decrypt the channel again. For Digital Devices, we use the KSPROPERTY_DD_DECRYPT_PROGRAM property. It seems that the current Digital Devices driver ignores this request, maybe because it thinks that the CI/CAM is already decrypting the channel. The effect is that any new streams remain encrypted.
Could you please investigate. Please don't hesitate to ask if you have any questions.
Best regards,
[11:12:50] Norbert: thanks, kind greetings back
[11:12:57] FreakyJ: I will tell him
[11:13:03] FreakyJ: Is that helpful for you?
[11:13:24] Norbert: This is no bug Bug, but a limitation which is present while using MTD. It is not possible to do it doifferent with MTD
[11:13:35] Norbert: in single Transponder Mode it is working
[11:14:46] Norbert: I know that Sky sometimes adds audio tracks later, but we have to mix a new transponder and build the Elementary streams together which are known at the time of tuning.
[11:15:20] Norbert: There is no way to do it differently with MTD
[11:16:06] FreakyJ: If you say so this will be the truth
[11:16:08] FreakyJ: *und (correction not relevant for translation)
[12:00:58] Norbert: You can switch between these two modes if you add the CI in the config tool only to one tuner. That means that the whole transponder gets send to the CI
[12:01:50] Norbert: If you add more than one tuner to the CI you automatically have MTD, that means we mix a new transponder from the selected programs and send it to the CI
[12:27:03] FreakyJ: thank you
[12:27:27] FreakyJ: Is it okay if I post our conversation in our forum + eng translation?
[12:27:45] Norbert: sure
[12:27:52] FreakyJ: thank you
[12:28:01] FreakyJ: In cas mm has any further question I will write you again^^
[12:28:54] Norbert: I already had this topic that's the reason why I could answer this so fast. I already discussed that with our Devs
[12:29:11] FreakyJ: hehe, I was surprised that the answer came so fast .D
[12:29:12] FreakyJ:
Like I wrote above: If you have any additional questions/inputs please let me know. I will take care of it
- July 25, 2010
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seems so...
i would rather say it is the way how MTD works: it can either ignore new PMTs or it need to break complete muxed stream and rebuild it. Second approach means that ALL currently decrypring streams will be stopped and then restarted again. That is why DD decided to ignore new PMTs (my guess)
btw, @mm1352000 what do you do in that patch to get it updated with new PMTs?
btw, @mm1352000 what do you do in that patch to get it updated with new PMTs?
- September 1, 2008
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No, I don't think so. IMO it is a limitation of their driver architecture or code.
That is possible. @Brette or @HTPC_Sourcer could test this by recording another encrypted channel at the same time as the Sky Cinema recording and see what happens to the second recording when the Sky Cinema recording starts, changes and stops. The second recording should be scheduled to start before and finish after the Sky Cinema recording to see the full effects.
But having said that...
@FreakyJ: please thank Norbert for his comments and send the following response.
I understand that it is not possible (or not easy) to automatically handle dynamic PMT changes. That is okay. I do not expect you to do that. What I expect is that when we send KSPROPERTY_DD_DECRYPT_PROGRAM to the DD driver that it would not ignore the request.
The test sequence is this:
- Tune channel.
- Send KSPROPERTY_DD_DECRYPT_PROGRAM.
- [Time passes]
- Channel streams (PMT) changes.
- Send KSPROPERTY_DD_DECRYPT_PROGRAM again.
- Decryption does not change.
I send a fake decrypt request, like this:
- Tune channel.
- Send KSPROPERTY_DD_DECRYPT_PROGRAM X.
- [Time passes]
- Channel streams (PMT) changes.
- Send KSPROPERTY_DD_DECRYPT_PROGRAM Y.
- Send KSPROPERTY_DD_DECRYPT_PROGRAM X.
- Decryption changes.
Code:
int hr;
if (_prevServiceId > 0 && _prevServiceId == serviceId)
{
_prevServiceId = 1;
if (_prevServiceId == serviceId)
{
_prevServiceId++;
}
Log.Log.Debug("Digital Devices: service ID {0} same as previous, setting fake service ID {1}", serviceId, _prevServiceId);
Marshal.WriteInt32(pSid, _prevServiceId);
hr = pControl.KsProperty(ref KsProperty, Marshal.SizeOf(KsProperty), pSid, paramSize, ref dwReturned);
Log.Log.Debug("Digital Devices: result = 0x{0:x}", hr);
}
Marshal.WriteInt32(pSid, serviceId);
hr = pControl.KsProperty(ref KsProperty, Marshal.SizeOf(KsProperty), pSid, paramSize, ref dwReturned);
Log.Log.Debug(FormatMessage(String.Format("--> Setting service id {0} for decrypting returned {1}", serviceId, hr)));
_prevServiceId = serviceId;
return (hr == 0);This feels like a really bad hack...
- July 25, 2010
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Thanks FreakyJ, had forgotten to say recording from the Sky Cinema HD.
As I can see, you got only mpeg audio stream left in your example.
Code:
Allgemein
UniqueID/String : 234619561156365703537825570468066453938 (0xB082157657851EE86A74AD401D4B69B2)
CompleteName : F:\Spielfilme\1080i\Killing Them Softly - (2012) - [tt1764234]\Killing Them Softly - (2012) - [tt1764234].mkv
Format : Matroska
Format_Version : Version 2
FileSize/String : 3,18 GiB
Duration/String : 1h 33min
OverallBitRate/String : 4 876 Kbps
Encoded_Application : Lavf52.64.2
Encoded_Library/String : Lavf52.64.2
Video
ID/String : 1
Format : AVC
Format/Info : Advanced Video Codec
Format_Profile : High@L4.0
Format_Settings_CABAC/String : Ja
Format_Settings_RefFrames/String : 3 frames
CodecID : V_MPEG4/ISO/AVC
Duration/String : 1h 33min
BitRate/String : 4 395 Kbps
Width/String : 1 920 Pixel
Height/String : 1 080 Pixel
DisplayAspectRatio/String : 16:9
FrameRate_Mode/String : konstant
FrameRate/String : 25,000 FPS
Standard : Component
ColorSpace : YUV
ChromaSubsampling : 4:2:0
BitDepth/String : 8 bits
ScanType/String : Interlaced
ScanOrder/String : oberes Feld zuerst
Bits-(Pixel*Frame) : 0.085
StreamSize/String : 2,86 GiB (90%)
Default/String : Ja
Forced/String : Nein
colour_primaries : BT.709
transfer_characteristics : BT.709
matrix_coefficients : BT.709
Audio
ID/String : 2
Format : AC-3
Format/Info : Audio Coding 3
Format_Settings_ModeExtension : CM (complete main)
Format_Settings_Endianness : Big
CodecID : A_AC3
Duration/String : 1h 33min
BitRate_Mode/String : konstant
BitRate/String : 384 Kbps
Channel(s)/String : 2 Kanäle
ChannelPositions : Front: L R
SamplingRate/String : 48,0 KHz
BitDepth/String : 16 bits
Video_Delay/String : -40ms
StreamSize/String : 256 MiB (8%)
Language/String : Deutsch
Default/String : Ja
Forced/String : NeinAs I can see, you got only mpeg audio stream left in your example.