Latest post Tue, Jul 3 2018 4:01 PM by George Angeludis. 11 replies.
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  • Mon, Jul 2 2018 6:20 PM

    • bushfilm
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    Video freezing

    Hi folks,

    I haven't done any editing in a while so these may be newbie questions. So here goes: I have a PC with an i7 motherboard and 16 gigs of RAM. I am importing some video shot in .mov format at 72mbps, from a Panasonic G3 camera. After importing (and syncing audio), I noticed that the video doesn't play back smoothly, it seems to stutter or even freeze up for a few frames, then it catches up and plays ok until the next time it stumbles.

    I've tried playing it back using the lowest (yellow screen) resolution but it still hangs. I've never had this problem with this computer and camera so I can't figure out why it is hanging up.

    I could bump up the RAM to 32 gigs, but not sure if this will solve issue. Or should I re-digitize everything at a much lower resolution and then up-rez later? Currently it is at Dnx 175 but I could certainly do my editing at a lower resolution if this would solve the problem. I'm also wondering if I need to set up a RAID array in order to work with this material.

    Any help or suggestions would be deeply appreciated, I need to solve this before the next shoot which will produce a ton of video that will need to be imported.

    Thanks to all!

  • Mon, Jul 2 2018 7:27 PM In reply to

    • bushfilm
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    Freezing follow up

    I just noticed that at the very top of the timeline window, on some of my clips, there are tiny red dots and a few short streaks that line up with the video issues, stumbling, freezing for a few frames, etc. They don't seem to appear on all of the clips, but are present on some of them.

    I am totally stumped here; norrmally this computer plays back the files imported from my Panasonic GH3 perfectly so I don't understand. These files are the best and probably biggest the camera can produce, .mov at 72mbps; is this the problem?

    I have a big shoot coming up so I really need to figure this out. Thanks!!

  • Mon, Jul 2 2018 7:33 PM In reply to

    • ramz434
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    Re: Video freezing

    I would definitely experiment with one of the clips at DNX36 before re-transcoding everything.

    Also whats the hard drive that your transcoding to? Trying another hard drive could narrow down the problem as well.  

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  • Mon, Jul 2 2018 7:35 PM In reply to

    • bushfilm
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    Re: Video freezing

    thanks, I'll try the clip experiment. Hard drive is a standard SATA III internal drive.

  • Mon, Jul 2 2018 8:20 PM In reply to

    • BarkinMadd
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    Re: Freezing follow up

    Not familiar with the GH3 but what resolution and codec are those mov files? MOV is not a codec, it's just a wrapper. Is it possible that you are now using UHD footage whereas previously you were shooting HD?

     

    Red dots probably mean CPU limited playback but I can never remember. Could also be disk limited. 

     

    You mentioned that you import the footage to DNxHD 175 - is that correct? This answers my first question, I suppose. 

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  • Tue, Jul 3 2018 12:23 AM In reply to

    • bushfilm
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    Re: Freezing follow up

    Hi Barkin,

    Well, I am getting thoroughly confused. What I've found is that some interviews I shot a couple weeks ago with the same camera and same settings play back just fine, and they were imported to Dnx 175. Does this mean I need to re-import the second batch of clips from the more recent interview?

    I tried re-importing one of the recent clips to Dnx 36 and it played back fine. So I'm assuming the weak link is somewhere in my computer system, but, since I am not very good with tech stuff, it might be something else.

    If I decided to re-import everything to a lower rez, does this mean I could just delete the media, not the clips and then bring everything back in at low rez? Would this affect sub-clips and sequences? Basically I have sync'ed up maybe two hours worth of footage to audio from a Tascam audio recorder, and I would rather not have to repeat this laborious process.

    The footage is playing back from a standard SATA III hard drive (6gbps) and I haven't had any problems in the past, although this is the first time I've imported this much stuff.

    As far as resolution, I think all the footage is 1920X1024, 30p, using the ALL-INTRA codec. This is according to the info screen on the camera. The footage from last week is at 24 fps, so I guess I screwed up by not checking the settings more carefully. Maybe I need to open a second project at 30fps for this latest stuff and hopefully, I can combine it all without too many headaches.

    Anybody who can help, I'd really appreciate it...I need to figure this out soon!  Thanks!

     

  • Tue, Jul 3 2018 12:29 AM In reply to

    • bushfilm
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    Re: Video freezing

    Thanks, ramz

     

    I tried the clip experiment and it played back fine at Dnx 36. However, I'm thinking my problem might lie elsewhere. Turns out I inadvertently shot the latest interviews at 30 fps, instead of 24 fps, like the other footage from two weeks ago. My bad.

    Do you think this is causing the buggy issues? Maybe I should open a new project in 30 fps, just to see if this would correct the problem?

    If I do re-import all the footage at Dnx 36, could I just delete the media, not the clips, and then low-rez? Would this affect sub-clips, sequences, etc.?

    Hope I haven't screwed myself royally. Thanks for your help and anyone else who could pitch in here.

  • Tue, Jul 3 2018 6:02 AM In reply to

    Re: Freezing follow up

    bushfilm:
    I just noticed that at the very top of the timeline window, on some of my clips, there are tiny red dots and a few short streaks that line up with the video issues, stumbling, freezing for a few frames, etc.

    Any other colors along with the red? Yellow or blue, perhaps?

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  • Tue, Jul 3 2018 9:32 AM In reply to

    • Bruno M
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    Re: Freezing follow up

    camoscato:

    bushfilm:
    I just noticed that at the very top of the timeline window, on some of my clips, there are tiny red dots and a few short streaks that line up with the video issues, stumbling, freezing for a few frames, etc.

    Any other colors along with the red? Yellow or blue, perhaps?

     

    Here's the Avid document that explains the colour codes...

    http://avid.force.com/pkb/articles/en_US/troubleshooting/en274819

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  • Tue, Jul 3 2018 11:12 AM In reply to

    Re: Freezing follow up

    When you import you amke new Avid media at whatever resolution your media creation is set to of the whole clip.

    AMA linking allows you to Transcode to a resolution of your choice but of selected partys of the clip if you wish. All if you wnat to or subclips.

    Playback ability will be limited by the speed of the drive (if it s single HDD then its sustained datarate maybe low) SSD is better RAID of a number of HDDs better as well.

    If the media is the wrong framerate on import it is converted (crudely) the the project framerate. If you AMA link then it adds a motion adapter to play at the project framerate.

    And don;t forget the source media is longGOP so a low datarate would be expected 72mbps for longGOP is pretty high and certainly higher than frame based DNx175.

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  • Tue, Jul 3 2018 3:47 PM In reply to

    Re: Freezing follow up

    Pat,

    you lost me here.

    How is the 72mb/s higer than 175?

    P.S. I use the 200 All-I codec 4:2:2 10 bit from my Panasonic GH5 transcoded to DNxHD185x (PAL)

    and it works flawlessly (untill too many FX's added) on my old PC.

    Desktop
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  • Tue, Jul 3 2018 4:01 PM In reply to

    Re: Video freezing

    bushfilm:

    Hi folks,

    I haven't done any editing in a while so these may be newbie questions. So here goes: I have a PC with an i7 motherboard and 16 gigs of RAM. I am importing some video shot in .mov format at 72mbps, from a Panasonic G3 camera. After importing (and syncing audio), I noticed that the video doesn't play back smoothly, it seems to stutter or even freeze up for a few frames, then it catches up and plays ok until the next time it stumbles.

    I've tried playing it back using the lowest (yellow screen) resolution but it still hangs. I've never had this problem with this computer and camera so I can't figure out why it is hanging up.

    I could bump up the RAM to 32 gigs, but not sure if this will solve issue. Or should I re-digitize everything at a much lower resolution and then up-rez later? Currently it is at Dnx 175 but I could certainly do my editing at a lower resolution if this would solve the problem. I'm also wondering if I need to set up a RAID array in order to work with this material.

    Any help or suggestions would be deeply appreciated, I need to solve this before the next shoot which will produce a ton of video that will need to be imported.

    Thanks to all!

    Can you tell us which is the CPU?

    On which MC version are you?

    32 G will for sure make a difference.

    SSD for OS.

    RAID 0 is also a must (keep backups of the projects always).

    There is no need to use x if your material isn't a 10 bit and from what I know G3 doesn't shoot 10bit.

    So choosing 175 plain is better or even 145.

    Desktop
    Corsair RM750X/Asus P8Z68 Deluxe(Gen3)/i7 2600K@4.4/Corsair 32G DDR3/PNY Quadro P2000D(390.77)/Samsung 850 Pro SSD(OS) 256 GB/ 2x2TB WD RE4@RAID 0/LG BH16NS40/W10 Pro 64bit/Media Composer Software 2018.11 with Symphony Option on Dongle/2xHP 22'' Monitors/M-Audio AV30 Speakers.

     

    Larry as long as I live I will remember you.

     

    3 Heads Digital Films

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