Latest post Thu, Oct 2 2008 6:23 AM by dennislink. 9 replies.
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  • Sat, Sep 27 2008 1:53 PM

    • BarkinMadd
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    Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

    Hi - I'm using an HDR-FX1 to capture HDV over firewire to MC 3.0. I usually use the logging mode and then batch capture later. I'm finding that I can play through the video and find my log points fine when I play at real-time or shuttle very quickly, but when I try to frame-step the monitored image does not update (in MC 3.0).

    I've had this same trouble with Liquid  and wondered if this is something to do with the MPEG-2 but I would have figured that Avid would have figured out a way to improve this.

    Are these frozen images expected? If so, how do you get around this issue. Obviously I can use the camera's display or I suppose I could connect the camera to an external monitor....

    Any help, as always, is appreciated...

    Steve 

    MC 2020.8 | QT 7.7.9 | Continuum 2020.5 | Sapphire 2020.5 | Mocha Pro 2020.5 | Titler Pro 7.3 | Windows 10 Pro x64 (2004) | System: Asus x299, i9-7940X... [view my complete system specs]

    Steve

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  • Sun, Sep 28 2008 2:24 PM In reply to

    • BarkinMadd
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    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

     OK - let me ask this another way - any of you using HDV cameras - when you perform a capture or logging operation, do you monitor your video within MC, do you use the camera's LCD screen or do you use something else?

    If you do use MC's 'monitor' window, do you have the same problem with single frame positioning of the tape? I'm hoping to determine whether this is a problem with my machine, with MC or with the HDR-FX1 (or simply life with HDV).

    Thanks,

    Steve

    MC 2020.8 | QT 7.7.9 | Continuum 2020.5 | Sapphire 2020.5 | Mocha Pro 2020.5 | Titler Pro 7.3 | Windows 10 Pro x64 (2004) | System: Asus x299, i9-7940X... [view my complete system specs]

    Steve

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  • Sun, Sep 28 2008 11:20 PM In reply to

    • Whitehorse
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    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

     Steve,

    We don't really monitor HDV during capture as it's just a digital file transfer from camera or disc to the Avid edit systems Hard Drive.

    While importing HDV the Avid transcodes the footage to MXF files using the DNxHD TR 145 codec which eliminates the "Long GOP" file format of .m2t files. This is good because you can then work on a frame by frame basis in the MC3 instead of be limited GOP by GOP. I think that your frame-step problem is related to the GOP based files on your tapes.

    Good Luck

    MC 5.0.?, Windows XP SP3, Dell Precision T3400 2.66Ghz 4M E6750 CPU, WD 1TB Int HD, 4GB ECC Ram (Add3GB.exe set for 2.7GB), Nvidia Quadro FX3700, Highpoint... [view my complete system specs]

    Horse

  • Sun, Sep 28 2008 11:53 PM In reply to

    • jwrl
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    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

    Whitehorse:
    While importing HDV the Avid transcodes the footage to MXF files using the DNxHD TR 145 codec which eliminates the "Long GOP" file format of .m2t files.

    Does it?  My understanding is that Avid can, on request, transcode to a DNxHD codec, but that it normally handles HDV unconverted.  Avid will still allow you to single step through long GOP on a frame-by-frame basis.  It will also allow you to break the frame sequence when cutting.

    Because the additional processing required to handle long GOP loads your CPU more heavily the response time when single stepping can be slower.  Could this be your problem?

    MC 7.0.4 - Asus P6T Deluxe V2 mobo - Intel i7 920 2.66GHz - Windows 7 Ult64 SP1 - nVidia Quadro FX 1800 - 16 Gbyte low latency DDR3 RAM - Internal 8 Tb... [view my complete system specs]
  • Mon, Sep 29 2008 12:33 AM In reply to

    • Whitehorse
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    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

     Well you are correct that Avid captures and works with native HDV. I was reffering to importing .m2t files which as far as I can tell are transcoded on import. At any rate I think the frame-stepping thing is due to Long GOP. Thats why we don't really try to do much with HDV until it's been loaded into the avid file system.

     

    MC 5.0.?, Windows XP SP3, Dell Precision T3400 2.66Ghz 4M E6750 CPU, WD 1TB Int HD, 4GB ECC Ram (Add3GB.exe set for 2.7GB), Nvidia Quadro FX3700, Highpoint... [view my complete system specs]

    Horse

  • Mon, Sep 29 2008 12:35 AM In reply to

    • BarkinMadd
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    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

     Thanks to both of you for your replies. A couple of things. First, by default if you use the HDV raster setting for you project, Avid keeps the long GOP format during capture. Secondly, my problem is not after capture, it during logging when I'm shuttling the tape back and forth and I'm trying to find a specific location to assign a mark-in (or mark-out).

    Slow-motion shuttling with HDV and my FX1 is poor - the image does not update unless I shuttle at real-time or faster. It's hard to precisely set the mark In/Out using the logging tool unless I watch the LCD on the camera itself.

    OK - so why would I need precise In/Out points? I don't - I was just asking this quesiton to determine if others who work with HDV observe this issue.

    Steve

    MC 2020.8 | QT 7.7.9 | Continuum 2020.5 | Sapphire 2020.5 | Mocha Pro 2020.5 | Titler Pro 7.3 | Windows 10 Pro x64 (2004) | System: Asus x299, i9-7940X... [view my complete system specs]

    Steve

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    www.nelliedogstudios.com

  • Tue, Sep 30 2008 10:50 PM In reply to

    • dennislink
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    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

     Yes.  I got so frustrated with finding in and out points on tape or subsequent batch capture failures that I now capture the entire tape to disk before doing anything with it.  This increases the amount of footage that is on the HDD, but it certainly reduces the frustration level.

    Core Duo 2.4 GHz 2GB RAM nVidia Quadro FX 550 [view my complete system specs]
  • Wed, Oct 1 2008 3:36 AM In reply to

    • BarkinMadd
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    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

     That's my solution as well. Frankly, I might get a dedicated monitor for this purpose because the actual controls (through Avid) are quite good - it's the screen update that's poor. Had the same problem with Liquid.

    Thanks for the confirmation. What HDV camera do you use, if you don't mind?

    Cheers,

    Steve

    MC 2020.8 | QT 7.7.9 | Continuum 2020.5 | Sapphire 2020.5 | Mocha Pro 2020.5 | Titler Pro 7.3 | Windows 10 Pro x64 (2004) | System: Asus x299, i9-7940X... [view my complete system specs]

    Steve

    ______________________

    www.nelliedogstudios.com

  • Wed, Oct 1 2008 6:33 AM In reply to

    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

    BarkinMadd:
    it during logging when I'm shuttling the tape back and forth and I'm trying to find a specific location to assign a mark-in (or mark-out).
    I use a client monitor direct from the deck with BITC displayed whilst logging or capturing HDV via FW. Then just keep a vague eye on Avid's capture window and audio monitors. It is sometimes a leap of faith butthis method has served me reliably so far.

  • Thu, Oct 2 2008 6:23 AM In reply to

    • dennislink
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    Re: Capture from HDV source - monitoring video in MC 3.0 - frame stepping?

     My camera is the Sony ...Z1

    Core Duo 2.4 GHz 2GB RAM nVidia Quadro FX 550 [view my complete system specs]
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