Lossless joining of AVCHD clips - 720p60 at DVinfo.net

Go Back   DV Info Net > High Definition Video Acquisition > AVCHD Format Discussion

AVCHD Format Discussion
Inexpensive High Definition H.264 encoding to DVD, Hard Disc or SD Card.


Reply
 
Thread Tools Search this Thread
Old November 29th, 2010, 11:03 AM   #1
Regular Crew
 
Join Date: Sep 2010
Location: Seattle, WA
Posts: 145
Lossless joining of AVCHD clips - 720p60

Just curious to know what tools folks like for joining AVCHD clips without recompressing them.

I've been using Corel VideoStudio Pro X3 for a while, as a stand-in for Adobe Premiere, because of how well it works with AVCHD, particularly with regard to needless recompression of unmodified clips. When shooting in 1080i60, VideoStudio is a miracle. The trouble with VideoStudio is that its "smart-render" function doesn't work well with 720p60 footage, something I've lately been producing a lot of. VideoStudio happily ingests the 720p60 and spits it out as quickly as ever, but with major audio/video sync issues after the first cut.

I've also tried tsMuxeR. The tsMuxeR GUI advertises a "join" function, but regardless of 1080i60, 720p60, etc., the result has subtle audio/video sync problems that can become very non-subtle after several cuts. I don't get the feeling that joining .m2ts files is something tsMuxeR was really designed to do, but rather something that the author of the GUI wrapper app decided to bolt on later. Doesn't work for me unless I'm only joining two or three clips.

Anything else? I understand (or have heard) that Vegas Movie Studio and some of the other lower-cost NLEs can smartly render AVCHD. The trouble is that so many of the trials have this stuff ripped out due to licensing constraints, making it difficult for me to test this out with my footage and see if it works.

Best,
Aaron
__________________
Software Engineer, Video Hobbyist -- Sony FDR-AX100, HDR-CX12, Miller DS10/Solo, Premiere CS5.5, DYMO DiscPainter, 2010 Mac Pro 3.33GHz 6c
Aaron Holmes is offline   Reply With Quote
Old December 1st, 2010, 04:55 AM   #2
Regular Crew
 
Join Date: Sep 2008
Location: Beersheba, Israel
Posts: 111
Aaron:

I regret to say this but I do not understand what exactly are you doing in your post: are you asking, suggesting, or sharing?

If you are simply asking how to merge AVCHD clips without recompressing them in the process, then my answer will be use Sony Vegas Pro.

In Vegas Pro 9 (I believe, in the version 10 it holds true), in order to perform rendering without recompression, the width, height, frame rate, field order, profile, level, and bit rate of the source media, project settings, and rendering template must match.

In other words, if you opened AVCHD clips recorded in the 720p60 format in the project, whose width and height are 1280 and 720 respectively, and frame rate is 59.940 (i.e. double NTSC), and afterwards chose to melt them down into a M2T-type file using the template with the same width, height and frame rate, then the rendering process would go without any recompressing.

You can test this for yourself; just download the trial version of Vegas Pro 10. Once activated, the software becomes fully functional for the duration of 30 consecutive days.
Arkady Bolotin is offline   Reply With Quote
Old December 1st, 2010, 10:23 AM   #3
Regular Crew
 
Join Date: Sep 2010
Location: Seattle, WA
Posts: 145
Hi, Arkady:

Quote:
Originally Posted by Arkady Bolotin View Post
Aaron:
I regret to say this but I do not understand what exactly are you doing in your post: are you asking, suggesting, or sharing?
It was all in the first line. :) I am interested to know what people are using to do this. Everything else in the post was about the problems I have faced with what I am using.

Quote:
Originally Posted by Arkady Bolotin View Post
If you are simply asking how to merge AVCHD clips without recompressing them in the process, then my answer will be use Sony Vegas Pro.

In Vegas Pro 9 (I believe, in the version 10 it holds true), in order to perform rendering without recompression, the width, height, frame rate, field order, profile, level, and bit rate of the source media, project settings, and rendering template must match.
Yes, that is indeed all I am trying to do. I'll give the Vegas 10 trial a go. I was never successful in getting this to work in Vegas 9, although it is certainly possible that I missed a single setting that made the difference. One of the things I love about Corel (which is why I sooooo wish it worked well with 720p60!) is that, when rendering, you can choose things like "Same as first clip," or have it auto-choose for minimum recompression with "MPEG Optimizer." Really a great idea, but alas the A/V sync issues with 720p60. :-(

Best,
Aaron
__________________
Software Engineer, Video Hobbyist -- Sony FDR-AX100, HDR-CX12, Miller DS10/Solo, Premiere CS5.5, DYMO DiscPainter, 2010 Mac Pro 3.33GHz 6c
Aaron Holmes is offline   Reply With Quote
Old December 1st, 2010, 11:01 AM   #4
Regular Crew
 
Join Date: Sep 2008
Location: Beersheba, Israel
Posts: 111
Hi Aaron,

100 percent agree with what you said about the Corel recompression. I wish the Vegas had the same thing...

Regarding Vegas Pro suite, the most tricking part (in minimizing or avoiding at all the recompression) is to deduce the right bit rate of your source media. Just typing 24 Mbps into the filed, which provides the maximum bit rate of the rending template, sometimes is not enough: you should know the maximum bit rate of your source precisely.

For that purpose, I recommend MediaInfo free software: it will give you the detailed and elaborated information about your source video codec, aspect, fps, bitrate, etc.
Arkady Bolotin is offline   Reply With Quote
Old December 1st, 2010, 11:57 AM   #5
Regular Crew
 
Join Date: Sep 2010
Location: Seattle, WA
Posts: 145
That's good to know. I'll give MediaInfo a shot together with Vegas 10. It's quite possible that I tried 24Mbit/s figuring that anything there or lower would make it through unscathed. I generally use AC3 audio and not PCM, however, so the peak will be somewhat lower (~22Mbit/s, I believe).

Thanks!
Aaron
__________________
Software Engineer, Video Hobbyist -- Sony FDR-AX100, HDR-CX12, Miller DS10/Solo, Premiere CS5.5, DYMO DiscPainter, 2010 Mac Pro 3.33GHz 6c
Aaron Holmes is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > High Definition Video Acquisition > AVCHD Format Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 08:09 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network