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Export process _adds_ stuttering to movies with frame-rate change

1830 Views 26 Replies Latest reply: Nov 28, 2012 5:56 PM by betaneptune RSS
  • AppleMan1958 Level 7 Level 7 (27,335 points)

    I may be looking at this wrong, but I see no advantage in going to uncompressed.

     

    A good analogy would be starting with an MP3 music file, and then converting it to an uncompressed WAV file. The file will be much larger, but you do not regain any material that was compressed out to make the MP3.  Another analogy would be starting with a RAW file in Aperture. Then create a JPEG. Through the compression to JPEG you lose some detail. Then take the JPEG file and convert to uncompressed. You just get a larger file that includes all the info in the JPEG file. But maybe I am missing something.

  • AppleMan1958 Level 7 Level 7 (27,335 points)

    I would suggest sharing your movie in Apple Intermediate Codec rather than uncompressed.

     

    For sound, the standard for audio on a camcorder is 48khz. The standard for a music CD is 44.1khz. The standard for a DVD is 48khz. iMovie seems to automatically mix to 44.1khz. I don't know why, but I would guess that it is easier to resample the low resolution voice track from a video to match the high resolution music track than vice versa.

     

    My guess is that Smugmug could handle 44.1 audio as long as it is 128kbps AAC, but you could test.

     

    My further guess is that they would take whatever you send them, but then they would have to process it on their end to meet their bandwidth requirements. This is what YouTube does. They take what you send them and then compress it to their internal standards. My theory for YouTube is to give them the highest quality file that I can, so that when they compress it, they have a lot to crunch on. With the SmugMug specs, it would already be highly compressed.

     

    Your size in the Events folder is 1440x1080, but the size of your finished movie should be 1920x1080 assuming you used FIT to make it fit within the 1920x1080 frame by letterboxing.

  • AppleMan1958 Level 7 Level 7 (27,335 points)

    I suggested AIC because you wanted to use MPEG Streamclip for compression. If it was me, I would do the whole thing in iMovie (and go straight to h.264), because I do not see a benefit of using MPEG Streamclip in your case.

     

    The advantage of using 1920x1080 with black bars is that you can fit the 1440x1080 footage into a 1920x1080 frame with no scaling. My 8mm footage came back as 1560x1080 Motion JPEG, which is an odd size, so I wanted to preserve the individual pixels without scaling.

     

    I have 50 Mbps internet download speed and 10Mbps up. I try to watch YouTube in 1080P and most of the time it works. But if there is congestion on the internet between me and YouTube, it doesn't play smoothly sometimes.

  • lhaw Calculating status...

    Hi there,

    After a week of playing with settings and smugmug uploads I realized that you don't really need to use the recommended MPEG converter (or any other 3rd party program) to get the videos in the right format.  Like you I was sharing from imovie (30 minutes), converting in MPEG (30 minutes) and then uploading to Smugmug (something less than 30 minutes).

     

    I started playing with the 'Export Movie using Quicktime' option in iMovie instead and after many failed attempts finally got a combo that is suitable for upload to Smugmug (now we just need something that goes direct from iMovie to Smugmug but at least this is something of a good start).

     

    Here's the options I used;

    Share / Export using Quicktime

    Choose the file name and location

    Click 'Options'

    In the Video box, click 'Settings'

    Compression Type:  H.264

    Frame Rate:  Current

    Data Rate:  Restrict to 3200 kbits/sec (I tried to mimic the MPEG setting recommended by smug mug so chose the restriction based on the resolution to restriction chart they had)

    Encoding:  Faster encode (Single-pass)

    Click 'OK'

    Still in the Video box, click 'Size'

    Dimensions:  1280 x 720 HD (that's what I needed, if you choose something else you'll need to change your data rate too I think)

    Click 'OK'

    In the Sound box, Click 'Settings'

    Format:  AAC (not sure if this is the best one but it worked for me.  i tried with one of the others and got zero sound)

    Rate:  48 (again tried to mimic smugmug recommendations)

    Quality:  Normal

    Encoding Strategy:  Average Bit Rate

    Target Bit Rate: 128

     

    After saving the file this way direct from imovie I was able to upload direct to smugmug (as long as I remembered to keep the file under 20 minutes!  just for the record, 20:01 will not work - yep, I tried it )

  • KROlsen Calculating status...

    betaneptune,

     

    I'm perplexed by the ability to choose the "NO Compression" option in the QuickTime compression box. I read in my Missing Manual for iMovie 11 that this is an option BUT it is not an availible choice when I walk through the Quicktime compression choices. I don't get the ability to get to "None" as you have outlined.

     

    Share > Export using QuikTime...> Options > Settings > Set Compression Type to None

     

    I only have the following options undr the Set Compresion type..

     

    Animation

    Apple Intermediate Codec

    DV - PAL

    DV/DVCPRO - NTSC

    DVCPRO - PAL

    DVDPRO50 - NTSC

    DVCPRO50 - PAL

    H.264

    MPEG-4 Video

    Photo - JPEG

     

    I actually want the "None" option but it is not there. So, what is the secret to getting to the "None" setting?

     

    I'm running an iMac 2011,10.7.5 and QuickTime 10.1

     

    Appreciate your help. Thanks.

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