7 Replies Latest reply: May 7, 2012 12:57 AM by polymorph23
polymorph23 Level 1 Level 1 (0 points)

O.K - This is driving me crazy!

 

Just imported and successfully edited footage from my new JVC HD GZ-EX210 Camera into Final Cut Pro 7.

 

The finished, exported .mov file (using Export>Quicktime Movie) looks fine. However, whatever I do to try and successfully convert this.mov file into mpeg4 I either get sudden jerks (after a few seconds of the footage looking fine) or I get flickering and problems with jerkyness.

 

The original files before import via Log and Transfer were AVCHD 1920x1080p files (I believe the frame rate is 50 fps).

 

After FCP converted the files, movie inspector showed that the files are now:

 

Apple ProRes 422

Aspect Ratio Square

Frame Rate 29.97

Field Dominance: Upper (Odd)

 

After I dragged the files - now in my browser - into my sequence, FCP asked me if I wanted to set the sequence to the format of the clips I was editing, which I did.

 

Footage looks great in the sequence and no need to render it.

 

It may or may not be important to note regarding my problem that the camera is p (progresive scan). I don't know if the FCP internal conversion of the camera files dealt with this. As I said - everything looks fine in the timeline.

 

The sequence settings show:

 

Frame size 1920x1080   -   HDTV 1080i (16:9)  > (NB: There is no seeting in FCP for 1920x1080 50p - only 30p)

All other setings match what the movie inspector says.

 

Please help!

 

Mark


Final Cut Pro 7, Mac OS X (10.5.8)
  • 1. Re: Problem compressing converted HD .mov to mpeg4
    David Mclaine Level 4 Level 4 (1,855 points)

    I believe this is a PAL camcorder, in your sequence settings what does it say under editing timebase? it should show 25 or 50.

    DM

  • 2. Re: Problem compressing converted HD .mov to mpeg4
    polymorph23 Level 1 Level 1 (0 points)

    The Camcorder was purchased in North America, so it' NTSC over here. Frame rate in Final Cut Pro is automatically set to 29.97 after it imports the footage and there are no major visible problems until after youtube has uploaded:

     

    http://www.youtube.com/watch?v=4VHByjcs-n8&list=UUSCZm618F5deYQzcZLiw-vg&index=1 &feature=plcp

     

    At around 0.51m, 1.20m and 2.08m motion lines/ glitches are most noticeable. Seems to happen mostly during panning/ movement shots. Full HD at fullscreen is not a problem - all other settings are.

  • 3. Re: Problem compressing converted HD .mov to mpeg4
    polymorph23 Level 1 Level 1 (0 points)

    It appears the source footage is actually 29.97

  • 4. Re: Problem compressing converted HD .mov to mpeg4
    David Mclaine Level 4 Level 4 (1,855 points)

    Ah,

    It was the 50fps that threw me. It seems that it may be the you tube conversion that is causing the problem, double  check the you tube guide for the correct upload settings.

    DM

  • 5. Re: Problem compressing converted HD .mov to mpeg4
    polymorph23 Level 1 Level 1 (0 points)

    To be honest, my fear is that this is really a problem with HD AVCHD/ .MTS files being compressed in general.

     

    What I'm finding is that whether de-interlaced (Upper/ Odd) or left as progressive (Field dominance none) I'm only seeing pans and motion looking O.K when the video is played at full HD definition at full size after allowing the file to fully load on youtube. At all other sizes the motion problems or choppyness seem to be a problem.

     

    Please look at these two short clips from the same original footage.

     

    1. In this clip there is no field dominance (no comb-like image when viewed close up) and the movie was compressed without de-interlacing. In other words, it was uploaded as a progressive movie (H.264 mpeg4)

     

    http://www.youtube.com/watch?v=xYlbYvXm23g

     

    2. In this clip, the source footage was de-interlaced (Upper/Odd) in Final Cut Pro (which originally imported the file with an Upper/Odd field in the sequence settings) and the de-interlaced options were also checked when it was converted to H.264 mpeg4.

     

    http://www.youtube.com/watch?v=nvCJ1yO21ME&feature=youtu.be

     

    Essentially, I can't tell the difference! As you will see, either way the motion issues are there when the video is not viewed full sized, full HD and fully loaded, leading me to wonder if it's to do with youtube or a more fundamental issue with my camera's AVCHD files being converted for editing in Final Cut Pro. I can't tell if this is a compression issue, but it seems to be. I'm at a loss as to how to deal with this! Any ideas!?

     

    One last note, I have found that if I convert to .mov (still H.264) with lots of de-interlacing, frame blending etc AND I downscale from the original 1080 to 720p AND I set my data rate to 15000 KBPS I get slightly better results - but still far from perfect!

     

    Thanks,

     

    Mark

  • 6. Re: Problem compressing converted HD .mov to mpeg4
    David Mclaine Level 4 Level 4 (1,855 points)

    Ok try this,

       Export your movie from FCP as a Quicktime Movie using current settings, drop your file into compressor and select the "You Tube" option when Compressor opens, submit and upload the finished file to You Tube.

    DM

  • 7. Re: Problem compressing converted HD .mov to mpeg4
    polymorph23 Level 1 Level 1 (0 points)

    Here's a link to the Quicktime converted footage using the method you suggested. The automatic setting in Compressor de-interlaces the Quicktime file and converts it to 1280x720. Played on my desktop before upload it looks O.K.

     

    http://www.youtube.com/watch?v=9tVQeNxhUbI&feature=youtu.be

     

    Once uploaded the same issue is evident. Looks acceptable only when fully loaded at full HD, full-sized.

     

    I'm not sure whether I should conclude this is an issue with youtube's compression or mine - but at this point I've tried all settings and have all but given up. It's really disheartening.