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Clod82
Currently Being Moderated

Keep original quality when exporting a sequence with AVCHD clips

Nov 26, 2012 3:53 AM

Tags: #avchd #editing #avchd;

Hi all,

 

As many of you, I create clips in AVCHD format, since this is the format used by most of new comomercial cameras.

In particular, I use the action camera Contour GPS, with the setting 720p, 50 fps. According to the properties of the recorded clips, additional specifications are:

  • File extention: .mov
  • Codec: h.264,acc,text
  • Frequence: 13,178 bit
  • Pixel ratio: 1

 

For sure Contour GPS does not record as a professional camera and the quality is not excellent in itself. In addition, consider that, going down fast with ski or bike, it is not easy for the camera to record all the details of the images.

So, when editing, to me it is very important at least to keep the original quality of the clips…if I lose further quality, the outcome is unsatisfactory!

 

There are two questions related to editing quality I am not able to answer:

  1. In order to avoid quality loss on the project, I create a sequence starting from the available preset AVCHD, 720p, 50 fps. Then, I put ACVHD clips in the timeline, without any correction or effect, just cutting and joining. Why the line of the timeline is yellow and not green? I would expect the render is not required! Maybe with this render I am loosing part of the quality…
  2. I tried to export the sequence as AVCHD, 720p, 50 fps, pixel ratio 1…I mean, the closest format as possible to the original clips….but I have a significant loss of quality!! Since the sequence is just the sum of clips (without correction or effects), is it possible to export it without transcoding? Or at least without loosing quality…

 

I tried to find the answers in the forum and on other sites, but I was unsuccessful.

 

Thank you very much for your support

Ciao

Claudio

 
Replies
  • Currently Being Moderated
    Nov 26, 2012 4:33 AM   in reply to Clod82

    Cutting and joining requires a complete re-encoding of the long GOP format and thus quality loss. Nothing to do about that. The yellow bar means that your sequence settings and your source material do not match 100%. This may be caused by the .mov wrapper. You can try to create a new sequence from clip by right clicking on a clip in the project panel and see if that does not show the yellow bar. If it is still there, then is is the source material. The green bar only shows if you have force rendered the complete seuence.

     
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  • Currently Being Moderated
    Nov 26, 2012 9:11 AM   in reply to Clod82

    1. This has nothing to do with export quality, so it's safely ignored.

    2. You cannot export to any lossy format without losing quality.  To retain all the original quality, you'll need something lossless.  I recommend the UT codec in YUV420 mode.

     

    http://umezawa.dyndns.info/archive/utvideo/

     

    The only problem with this, however, is that it's not really much of a deliverable, meaning you can't put that on disk.  If you want a DVD or Blu-ray, you'll have ot go back to a lossy format.

     
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  • Currently Being Moderated
    Nov 26, 2012 12:11 PM   in reply to Jim Simon

    Hi Claudio,

     

    I am new to PP CS6, a consumer, and recently edited my first movie from footage shot on a Contour+ video camera, similar to your unit.   Disclaimer here ...

     

    Are you sure your footage is 50fps?    My Contour+ shoots in "60p", which is technically 59.94 frames per second. 

     

    While what folks are saying here is true that any time you encode video using a lossy compression algorithm you will lose quality, I would not expect you to experience "significant" quality loss.   That was not my experience.   I am wondering if you have some settings off one way or the other.  I have noticed (as a consumer) you have to be meticulous about how you create sequences and in what form and especially how you export sequences.

     

    Perhaps go back as Harm suggested and create a new sequence based on the clip by dragging a clip onto the new item icon.  Drop in your footage.  Then try exporting with H.264 Blu-ray format, 720 59.94 preset, check maximum render quality, maybe VBR 2-pass and see what comes out.

     
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