Jerky output from HDV
by Andrew Kelly
on
May 22, 2008 at 7:59:54 am
I have just started using my new Canon HV30 and recording in straight HDV, I have edited in FCP6 and imovie just to compare.
The captured video looks ok even at full screen but when I output to a quicktime file the video is jerky like it is getting stuck on a frame or so every group.
I have tried using compressor with different formats i.e. h264 same frame rate as source, 30 frames etc, output to m2v for DVD studio pro, still the same jerky video?
What should I use for best results with this camera?
Re: Jerky output from HDV by Jerry Alto on May 22, 2008 at 10:45:09 pm
Andrew- Try bringing the HDV quicktime you exported back into FCP. Is it still jerky on playback? I've noticed this too and the same file plays fine in FCP. My guess is that HDV playback requires faster processor speeds and Quicktime software has not been optimized for HDV playback. If you want HDV playback from the computer you may have to use the editing software. You can always go back to tape for HDV playback from there.
HTH,
Jerry
G5 Dual 3GB Ram
FCP5 Studio
External 1 TB SATA Raid 0
Kona LH, Second system w AJA ioLA
Sony Z-1
Re: Jerky output from HDV by Andrew Kelly on May 22, 2008 at 11:43:41 pm
Thanks Jerry,
I am actually taking the output to DVD studio pro to create a DVD and it plays with the same jerkiness on the TV.
One thing I didn't mention is I bought an NTSC version of the Canon HV30 and I live in Australia, didn't think it mattered because HD is universal (DOH), does that mean I have to set everything to NTSC even the DVD format?
Just checked again and the file plays nicely in the FCP viewer, and if I capture to imovie plays nice full screen.
Any converted file I have tried, .mov, .m2v, m4v etc all play with the jerky motion.
I am new to HDV and never had any issues ever with my old Sony DV and Sony Vegas(also new Mac user, surprised how many glitches I've had with it so far)
Re: Jerky output from HDV by Mike Johnson on May 23, 2008 at 6:03:17 pm
Are you authoring to DVD or HDDVD? If its HDDVD, the NTSC format shouldn't matter. But if it's standard DVD you're going to, you're actually going to be downconverting to SD, and thus the NTSC/PAL formatting will probably make a difference.
Re: Jerky output from HDV by Jerry Alto on May 23, 2008 at 6:15:50 pm
Andrew- No question HDV has its issues which are mpeg2 (GOP) related. The only thing I can say is that you have to test, test, test. Once your have a clean workflow be sure to write down the steps.
When we are down converting to SD we go into FCP component via our Kona card and then we have a very clean intrerframe format (8-bit uncompressed) from the get-go. Another common workflow with FCP is to edit a HDV native sequence then copy and paste it into your favorite SD sequence codec within FCP and let it render. Then go out to compressor for your SD mpeg2.
Another workflow is to down convert to DV via firewire directly from the camera/deck. I know the Sony camera/decks do this. I am not sure about Canon.
Another test is to go out to tape with your HDV native sequence. If the tape plays fine then you know you have to work on your software downconversions.
I've always worked in NTSC. Maybe someone else has info on possible issues with progressive VS interlaced.
HTH,
Jerry
G5 Dual 3GB Ram
FCP5 Studio
External 1 TB SATA Raid 0
Kona LH, Second system w AJA ioLA
Sony Z-1
Re: Jerky output from HDV by JB Letchinger on Jun 21, 2008 at 7:05:47 pm
I have gotten snagged up on the PAL/NTSC HDV issue myself.
Keep in mind, there are different versions of most HDV cameras!
in HDV only the old Z1 U and some of the Canon products seem to work at both 50i and 60i -
double check always that your camera has a 25P or 50i option before shooting for a PAL market!
I used compressor to convert a low budge project from NTSC DVCPRO HD 100 (HVX) to HDV Pal 50i.
then a friend outputed it for me to his HDV deck...
also -
I've heard of smoothness issues when shooting 24 P and digitizing at 59.94i HDV...
best to capture at the native rate of your master wth HDV and convert later I believe..
but I'm a camera guy who dabbles in post so take it all as IMHO.
