Smart Rendering hdv recording does not work

trevorjharris · Post by **trevorjharris** » Thu Jan 18, 2007 3:05 pm

If I capture hdv and then write it back to tape Videostudio re renders the video dispite smart rendering being set. Is there any fix for this.

Thanks

maddrummer3301 · Post by **maddrummer3301** » Thu Jan 18, 2007 3:59 pm

tyamada · Post by **tyamada** » Thu Jan 18, 2007 5:44 pm

There are programs that capture HDV as .mt2 files and edit them, Video Studio strips the information from the Transport Stream and makes them a Program Stream file. That is why when you write file back to tape it rerenders the file to put back the information that was stripped from the .m2t file.

Its not the camera its the program, you might want to look into:
http://kgbird.com/DVHSTool/

The video captured by DVHStools are m2t files and cannot be edited with Video Studio.

They can be edited with Womble.
http://womble.com/

maddrummer3301 · Post by **maddrummer3301** » Thu Jan 18, 2007 11:29 pm

tyamada · Post by **tyamada** » Fri Jan 19, 2007 12:34 am

I've written back to tape in VS10+, but don't like the way it handles writing to the tape. If for some reason you don't complete the write you have to re-render the whole file again, unless you have Media Studio Pro 8 and use it to write the file. The file isn't extension is .mpg but is actually a .m2t file.

trevorjharris · Post by **trevorjharris** » Fri Jan 19, 2007 1:31 am

As far as I understand from the MPEG specs the MPEG2 video data is the same in a transport stream as in a program stream. It is just that it is packed into 188 byte packets. This means that a program stream can be converted to a transport stream very quickly without doing any mpeg2 encoding. You will notice that Videostudio captures HDV transport streams and converts them to progam streams very quickly.

I have tried to write my own conversion program but unfortunately the HDV format uses some odd PID's and also has 2 private data streams. It is very expensive to buy the hdv spec and very little info is available on the net.

jchunter · Post by **jchunter** » Fri Jan 19, 2007 4:12 am

Trevor,
Mpeg2 Transport Stream video format is a PITA because most video editors can't handle it and most player software chokes on the packets.

You haven't said what you are trying to accomplish by writing video back to DV tape cassettes.

If you are trying to archive your video and all the project assets, then DV tape is the wrong medium because it can't store general files. I use dual external hard drives for this purpose - easier, faster, more capacity, more reliable, etc.

If you are trying to use your camcorder as a viewing device (through its component video interface), you will put wear and tear on some expensive tape heads. There are less expensive alternatives.

maddrummer3301 · Post by **maddrummer3301** » Fri Jan 19, 2007 8:14 am

jchunter · Post by **jchunter** » Fri Jan 19, 2007 4:13 pm

maddrummer3301 wrote:Then plug the External HD into the AVLP2/DVDLA player connected to a HDTV Monitor to view the footage. So, I defintiely have a use for the TS format to playback on the AVLP2/DVDLA device.

But what is the "use" of packetized video (Transport Stream) during playback or editing? These packets just have to be removed, in real time, before the video can be decompressed and displayed properly. My AVLP2 plays back 1920x1080 @VBR 25MbpsMpeg2 Program Stream (de-packetized) just fine from my external hard drive. BTW, I always use VBR. Moreover, having both formats around doubles your storage requirements.

AFAIK, Transport Stream was created only increase the probability of error-free transmission over lossy communication systems (e.g., sattelite broadcast, etc.).

BTW, there is are many users struggling with transport stream editing over in SonyHDVInfo foums. They are creating some ungodly complicated workflows to accomplish things that Video Studio does easily.

MD, could you help over on this thread?http://phpbb.ulead.com.tw/EN/viewtopic.php?t=19868
I can't find your post on MF / VS interference during HC3 capturing.

maddrummer3301 · Post by **maddrummer3301** » Fri Jan 19, 2007 8:50 pm

jchunter · Post by **jchunter** » Sat Jan 20, 2007 3:33 am

maddrummer3301 wrote:
BTW, there is are many users struggling with transport stream editing over in SonyHDVInfo foums. They are creating some ungodly complicated workflows to accomplish things that Video Studio does easily.

Because they are trying to edit mpeg2 video,

No, its because they are trying to edit m2t files, with all the packet baggage intact, that has to be removed in real time, which further complicates an already complicated procedure (decompressing mpeg2). If you lurk over on http://www.sonyhdvinfo.com/forumdisplay.php?f=21 you will see some roundabout, complicated workflows that would make Rube Goldberg proud.

maddrummer3301 · Post by **maddrummer3301** » Sat Jan 20, 2007 5:28 pm