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Bild und Ton asynchron (zum xten Mal?)

Picture and sound asynchronously (for the umpteenth time?)



Frage von peterg:
August 2005

Hi Folks,
I was sorry if I you probably nerve in this forum for the umpteenth time because of lack of synchronization of picture and sound, but somehow there is the worm in it. I examine the relationship between gestures / facial expressions and language. For this it is obviously necessary for sound and picture are as synchronously. At the moment I'm experimenting with different recording methods from the television set and over again, but note that picture and sound, on average, between 60 and 100 msec are asynchronously (or more accurately sound does later on). Now I do not know if this is normal. Is that perhaps a normal lag happens when the television (cable) and with which we must accept?

An example: heute-journal, recorded with SonyDSR-PDX 10P via S-VHS socket s.Videorecorder; transferred via Firewire and Video Studio 9 in an AVI file. In the following picture, the soundtrack for the words, "Come shows us' and the screen shots for 4 frames. When [m] (= have) blue pieces highlighted the lips be closed, in fact it is here but so that even with frame 103, then during the [o] are the lips and s.frame 105, ie during the [ m] on again! The beginning of the [m] is so ahead of about 60 ms the sound.

zum Bild

Does anyone of you advice as to whether this is normal and how can I correct this if necessary?

Thanks and greetings,
Peter



Antwort von LuFaHa:

Hello PeterG

as far as I observe this is different.
Sometimes on television directly (ie even if you're watching) an asynchronous clear, sometimes not.
For this reason, one might prefer in any Fal into consideration that Picture and sound are at least temporarily sent asynchronously. If this error occurs even in the studio, or only when the transmission is probably not easy to establish, and of case to case.

If it's only important to this investigation, please try DV material (for example, if you analyze yourself, movies), or there will be some TV recordings?
One possibility would be simply synonymous to move the video clip frames, so it is synchronously.

Why do you need to do this study? Is there perhaps alternatives to television recordings?

Greeting
LFH



Antwort von Blackeagle123:

Hello! So, if I record with my TV Card (Digital TV Skystar2) are my shots totally asynchronously. If I change the format works perfectly. Is the film than on the videotape synonymous already asynchronously? Or do you ever tested whether it could be s.der S-VHS jack? Emergency, but simply put the sound of 60ms forward!? Schaus, and then to you ...

I believe that now was full s.Thema by:)
Love Greetings
Constantin








Antwort von Ephraim:

Hello,
If the starting material with 32 kHz sound has been recorded in the PC equivalent to 48 kHz will reduce the soundtrack. Therefore, it is important to set all parameters equal

Ephraim



Antwort von Peter S.:

I assume you take the sound on the sound card: As soon asynchronicities arise because the TV card and sound card may be different priorities s.PCI bus and not get assigned gleichzeitg, but are served consecutively. The only solution a card that Picture and sound simultaneously digitized. A small asynchrony usually falls on not only for your application completely and cut lip-sync like the music video is deadly.
MFG Peter



Antwort von Markus:

"Peter" PeterG "" wrote:
An example: heute-journal, recorded with SonyDSR-PDX 10P via S-VHS socket s.Videorecorder; transferred via Firewire and Video Studio 9 in an AVI file.

Because the data is in capturing via Firewire already digital, is likely to occur in an asynchronous davorliegenden step. (S) VHS recorder since the dawn of Geizzeit sorry, no more quality products. Does the Picture of the Y / C connector synchronously with the sound from the RCA jacks? - Connect> TV there and watch.



Antwort von peterg:

Dear People,
Thanks for your comments. I think that the Asynchronizität may be because, as was recorded. I have tried that is synonymous with a TV card (PVR-250) and synonymous brings me to the same problem. However, I have taken up separately in both cases the sound (the S-VHS VCR using the RCA jacks, the TV card) on the sound card.

It seems, therefore, is whether the shift in the ARD is not as high as in the ZDF (about private, I can say nothing on n-tv strikes me, however, at the mere Draufschauen at times that diverge Sound and Picture).
When I analyze using the same procedure homemade videos, that's all - it must be s.Fernsehen So somehow. Perhaps the sender tolerate this offset.

If I have understood correctly, I am left as the only solution, audio and video synchronously and separated back together again. What procedure would you suggest there? I have experimented with MPEG2Schnitt by then, I have set the audio offset to -60. However, the picture quality will be pretty bad. What are you doing this?

Thanks and greetings,
Peter




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