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Bartholomew

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Wannabe Geek


#10978 23-Dec-2006 07:41
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Hi all, and Merry Christmas!

I have a Sony RDR-HX910 DVD/HDD recorder. PAL, Region 2, but made Region-free. I have had it for a few months but only now had the time to record all of my VHS tapes onto the HDD.

I edited shows and programs that had commercials in the middle, and so forth, but when I transferred them onto a DVD(+R) small bits reappeared. For example, when a commercial would come on I would insert a chapter mark, and do the same when the show was back on. That would create a chapter containing the entire commercial only, the next chapter being the show again. I would then delete that chapter and thus have a show without interruption, when playing back on the HDD, that is. Once I transfered the show to the DVD I would have maybe half a second or a second of the commercial beginning and then it would go over to the last half a second of the commercial (that was on just before the show continued), and THEN it would cut to the show again.

I do realise that the chapter marks I make are deleted once I transfer a title to a DVD. What I don't get it is how come what I don't see, what I thought I had deleted on the HDD, is there on the DVD? I checked the HDD title frame by frame, and those bits are not there. And yes, I am editing the original title, not a playlist. Am I editing incorrectly, am I missing something? I have also tried deleting the automated chapters that sometimes get it right with commercials and such if the transition is apparant enough, but the problem is the same.

Any help is really appreciated :)

- Bartholomew

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richms
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  #56256 23-Dec-2006 19:36
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mpeg is temporial compression, each frame relys on the last one, untill you get to a key frame, which are typically inserted every few seconds. It can only directly seek to a keyframe, and then it has to calculate the frames after that (which is why you cannot play backwards smoothly on most dvd players) - anyway, the only way to cleanly edit is on uncompressed video and then re-encode. Some software can be tricky and generate a new keyframe and drop it into the bitstream as needed, but simple stuff in conusmer gear cannot.

When playing on the hdd, it seeks from the chapter point to the next one, it needs to leave the keyframe and earlier frames to the second edit point there since it cant re-keyframe at the editpoint. On dvd there is no way of seeking direct to a non-keyframe, so it has to start at the one before it, the other option is to miss the start of the program, but you sure wouldnt want that!!

Why the start of the first commercial is copied is something I dont know. I despise standalone dvd recorders for this and many other reasons, and my recent experiance with a panasonic to back up some vhs's has lead to me deciding to sod it all and to do it on the PC since its easier to get a good result.




Richard rich.ms

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