DVStreamerPRO 2.3.2 (Evaluation) available for download
Q : Im using DVStreamer 2.3.2Pro (evaluation). I have saved one file in one session and I cannot restore it.If I try to restore then the message "Header OK" does NOT come, so the File cannot be restored. Its saved on an already used (recorded 10-20 times) tape in LP mode. There is maybe a dropout at the end of the Header, the Header begins with 4seconds. Is it possible to restore the data without the Header? Is there any way to restore the data? I think the problem is the old Tape Maybe I should save my files twice in Future?
Answer : Your question is quite interesting. The header is stored in redundant way (3 times spaced apart by 2 second), and, normally, is always recovered even on old tape. The only reasons why it would not be recovered are :
Of course, you can save AVI files using DVStreamer in the same way as any other file, but ....
DV camcorders are designed to store DV video in native format. DVStreamer uses a trick to fill in data into video frames, so the data can be copied and restored from the DV tape. You can always save a DV AVI file to tape using DVStreamer, but by doing this, you loose about 30% capacity (compared with native DV). The only thing you win is error protection.
In native DV mode, there are very few errors transferring to tape and back, and DV is not too sensitive to a few errors. So we don't recommend that you use DVStreamer to save DV format files. Use native DV mode, with your capture software.
On the other hand, DVStreamer is very convenient to save MPEG, DIVX, MP3 or JPEG files to tape.
Depending on your settings, the default active movie
windows could be quite large. A simple reghack changes the play resolution to
1/2 or 1/4 the size of the original. CPU load also benefits by becoming lower.
Copy the red text to a notepadfile and save as *.reg, then doubleclick on it.
(user input from the Forum)
Q : Do you need to do the installation twice on dualboot system? I am using Win 98 AND Win 2000. Do I just have to do the installation DVStreamer (or DVStreamerPRO) in Windows 98 as I did or do I have to repeat it in Windows 2000? Both Win 2000 and Win 98 have access to the same directory for DV Streamer: C:\Program Files\DV Streamer.
Your question is quite valid. If you have a dual boot computer, you need to do the installation two times : one time for each OS. The P_Gen.ax (or DVSPRO_Gen.ax) component is in fact a DLL. Each OS has to be informed of its location (the directory) and its capabilities. This is done by the registration process. If the capabilities change, then the only way to update is to un-register and re-register. This is like installing MS Office on a dual boot system : you need to do it twice, even if it is installed the same directory for both OS.
Q : Is there a risk of damaging my DV? Will it wear the camcorder heads and prematurely age my camcorder? I wonder if I can try your software with my camcorder, as this my model is not listed in your compatibility list. Is there any risk of damaging my camcorder, while using your software, in case it will not be 100% compatible?
DVStreamer generates a standard DV video stream. The data is hidden within the video information, and the DV does not see any difference with the upload of an AVI file. So far, nobody has ever reported any damage at all to the DV camcorder. The worst case has been a spontaneous reboot of the DV camcorder itself - it crashed- (2 occurences on JVC camcorders - problems of DV-in programming suspected in those two cases).
One hour of use of the DV for saving and restoring data generates strictly the same wear and tear on the DV mechanism and recording heads as one hour saving and capturing video.
All DVStreamer development and qualification tests are made with my personal Sony PC100. Over the last 3 years, its been used both for personal video (150 hours) and DVStreamer tests (300 hours). It survived being dropped by my 2 1/2 years old son. It's been used with both Sony and TDK tapes, and its heads were never cleaned. It still produces error free recordings. Most debugging tests being done with very short files, the Play, Record, Search, Rewind functions has been used extensively (thousands of times), and work flawlessly.
DV tapes on the other hand are another story. The errors on any given part of the tape increase with the number of write or reads performed on this tape segment. Brand new tapes and recent tapes (less than 10 writes or read) provide error free recording. However, the number of errors increase with tape wear. Towards 100-200 write or read on any given tape segment, this tape segment becomes unusable for DVStreamer.
Q : Do you use RS FEC? I've tested it with byte compare of a 400MB file and everything seems ok (R1.1). If the header is damaged, will the entire file be lost?
No, DVStreamer does not use Reed-Solomon Forward Error Correction. The DVStreamer technology is subject of domestic and international patent application (Pat. pending.), and cannot be described in details for the moment. Be assured that the error detection and protection mechanism is particularly suited to DV, and is extremely reliable, and when the pop-up message says "no errors" or "errors can be/were repaired", it is 100% sure to the last bit.
The Header information is redundant (in fact several copies spaced by one second intervals), and one copy OK is enough to recover it. Even if the header is totally lost, the file could be recovered (although you would need a special version of DVStreamer for this), and as the name of the file is visible in the video, you could also restore it to its real file name...
The short answer is : yes. DVStreamerPRO has been tested successfully with DVCAM.
You raise here a very interesting question. There are two sides to it :the video format, and the file size.
It seems that your camera does not accept ATN search (searching automatically for a specific position on the tape). You should try using the non-ATN search. To do this, open the "More options" window, and untick the use "ATN search" box. If it does not improve the situation, it means that you should use the manual mode as follows :
- unselect the "autorestore" option (the choice of not using Auto-restore is persistent, so normally you don't have to un-tick the checkbox again if you have already done so for Saving).
- make sure that you have rewound the tape at the start of recording, in the header section
- start the DV in play mode from the DV itself
- press the Restore button on DVStreamer
- stop the DV when finished
This should work.
I suggest you switch back to the normal mode for your first tries, and not use the unprotected mode (because it helps getting a feeling about the behavior of your PC and DV, if there are errors or not, lost frames, etc....).
As stated by its name, an analog card captures the video from the DV camcorder from the composite video port. The video which was originally digital is converted to analog , and then reconverted by the capture card back to digital for editing on the PC. Because of what is called "quantification effect", the digital-analog-digital conversions required to upload and retrieve data on tape doe not restitute the exact original data. This is why an analog card cannot be used with our products. Nor can you use your VHS.....
On the other hand, when using the IEEE 1394 interface, all transfers are seamlessly digital, and it is exactly the same data which gets uploaded to the camcorder, written to tape, read and downloaded back to the PC.
This may happen due to problems reading the files to be saved. For some reason, the current file is not read fast enough to feed the camcorder.
If this value drops significantly below 128, it means the current file is not read fast enough.
There are several possible reasons for this you must consider :
You might loose an awful lot of time trying to (unsuccessfully) save and restore files due to any of these reasons. For example, Norton Antivirus might suddenly slow everything down after you have successfully saved 300 MB without problems, and then you notice the queue dropping to 60 and then to 30 and then going up again to 128. Even if the session is not stopped prematurely, there are good chances that this has caused an unrecoverable number of lost frames.
There are several possible reasons for this :
Nothing. The tool checks the internal system name : major and minor version number and system built as defined by Microsoft and reported by the system, not the "commercial name" under which the systems are known. The table below provides the matching commercial name.
This is due to the fact that you use a localized version of Windows, where some components used by DVStreamer do not have the same name as in the English version. In this case, run the Diagostics program, and send us an e-mail with the results. We will fix this.
The reason is that one component of DVStreamer, P_Gen.ax (or DVSPRO2_Gen.ax) - a Directshow filter - is not properly registered in the system registry, and cannot therefore be located by the application.
YOu can correct this situation by running the Regsvr32.exe program from a command prompt (DOS Window) with the filename as an argument :
regsvr32.exe "c:\Program Files\DVStreamer\P_Gen.ax"
regsvr32.exe "c:\Program Files\DVStreamer\DVSPRO2_Gen.ax"
(with the quotes). regsvr32.exe is usually located in the system or system32 windows directory.
When you register successfully, you get the following message :
If you don't get it (or did not get it), it means that registration failed.
A possible reason is that P_Gen.ax (or DVSPRO2_Gen.ax is not located in the same directory as DVStreamer.vpl (or DVSPRO2.vpl) and vp.dll.
Verify the proper location all files above, and check that you are using the correct .bat file.
Be careful, on dual-boot systems (for example W98 and W2K), there is a regsvr32 specific for each OS...., one under Windows/system for W98, another one under WINNT/system32 for W2K.
At the end of the one month period, the program will stop functioning. Should you wish to continue using DVStreamer, you will have to buy a license at the then prevailing conditions (see : Order).
NTSC is used in the US, North America, Japan. PAL is used primarily in Europe, Africa and the Middle-East. However, if unsure, check on your DV documentation. You can also run the diagnostics program which will detect your camcorder's standard.
Q : How reliable is the backup, is it safe enough for me to delete the files I backed-up from my drive?
Tape backup is safe, but there are several points to note :
Q : What happens if I delete the recording info from the list, will DVStreamer still be able to retrieve the info on the tape even if it's not in the list anymore?
The list information is not required to recover the data. Just position the tape into the header section of the session you want to recover, and launch DVStreamer with "Autorestore" unchecked. The session content is stored at the beginning of the data section, and is highly redundant (3 copies).
Last update : 12 February 2009 21:30 GMT