Brian Alexander
Forum Replies Created
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Never tried it but I doubt that MPEG Streamclip does a Telecine process to the footage. I would bet that by default the clip is sped up.
If you’re feeling up to it I would suggest creating a 24 fps video (or use your friend’s footage) and add visible time code overlay by running it through Compressor. Then take the video with the overlay and do your 24fps to 29.97 fps and inspect the result frame by frame. If you do not see added frames then something else is going on.
You know…I think I could have done this faster by just doing it rather than thinking about the process and trying to explain how to do this…
I’ll post my results shortly.
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Brian Alexander
Sr Video Engineer
Freeman AVS -
Here’s the original image:
And here’s what it looks like when I grab the frame and start to drag the frame.
This is not happening to motion video, I just want to figure out where the color sync issue is happening.
If you download these and do an A/B comparison (or use your Digital Color Meter.app on your Mac) the color/brightness shift is quite obvious.
Thanks for looking.
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Brian Alexander
Sr Video Engineer
Freeman AVS -
I haven’t read this yet but I’m putting it on the list.
One of the books I use as a tremendous resource (it has a geek factor of 8) is Keith Jack’s Video Demystified: https://keithjack.net/books/video-demystified-book/
Thanks Andrew!
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Brian Alexander
Sr Video Engineer
Freeman AVS -
I’ve been meaning to do this for some time now but thanks to Chris Blair for inspiring me to start this thread.
[Chris Blair] “I stumbled across this very good .pdf from telestream’s website. It has lots of good information about formats/codecs in general and encoding “recipes” in particular for compressor.
While much of it is geared toward compressor, most of the tips translate well if you use Procoder, Episode Pro, Squeeze, Adobe Media Encoder or even freebie encoders like Handbrake, Mediacoder and others.
https://www.telestream.net/company/news/pdfs/SimpleEncodingRecipes.pdf
Rhozet also has some fantastic .pdf based white papers on transcoding practices and formats/codecs.
https://www.rhozet.com/support_whitepapers.html
If you’re confused about codecs, formats/containers and compression in general, these are tremendous resources and “must-reads.”
Chris Blair
Magnetic Image, Inc.
Evansville, IN
https://www.videomi.com“Thanks Chris.
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Brian Alexander
Sr Video Engineer
Freeman AVS -
Thanks for the links Chris.
I would like to start another post and repost the links you just submitted.
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Brian Alexander
Sr Video Engineer
Freeman AVS -
I’ve seen the same thing in FCP. I haven’t had the time to troubleshoot it but one of our editors has made me aware of this issue. Of course when I went to see for myself, we couldn’t repeat the problem.
Playing the video in the timeline instantly dropped the saturation of the clip. Looks fine while sitting still but once the video starts playing, kablamo. I’m sure this is in the FCP manual but haven’t had luck on a quick search.
Additionally, this could be the same type of issue (or bug) when performing the following action: Open up a video in QuickTime (Codec or source doesn’t matter). Next, click anywhere on your video frame and drag. You will notice an instant gamma/brightness bump. What the heck is that? I’m sure it has to do with the Color Sync Settings but kind of interesting nonetheless.
If this was easy, just anybody could do it…
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Brian Alexander
Sr Video Engineer
Freeman AVS -
[Craig Seeman] “I’d follow up by asking your client how big is the internet (sorry I couldn’t help myself). “
The internet can’t be that big because it fits on all of our computers.
(sorry, couldn’t help myself)—
Brian Alexander
Sr Video Engineer
Freeman AVS -
[Tom Mooney] “I am not sure whether we need to deinterlace the footage.”
If this footage is really 720p then there will be no need to deinterlace because the footage is already deinterlaced, a.k.a., progressive.[Tom Mooney] “The original footage is shot 720p 30 and digitized into FCP using Apple Pro Res.”
Are you sure? What was the source shot/recorded with? Most 720p sources are 720p/60 (59.94). How did you digitize it into FCP? What equipment was used?[Tom Mooney] “The timeline has the field dominance set to none and it plays back fine.”
Even an interlaced source will look fine unless viewed at 100%. I would open the clip up in QuickTime for a true representation of the media. Look at the Movie Inspector in QuickTime for Codec, Bit Rate, and Frame Rate information. Always view your video at 100% for a true representation of your quality. Scaling up or down with monitors (even your laptop monitor) will introduce sampling errors and making your video look different than it actually is.[Tom Mooney] “I cannot see much difference unless their is allot of movement in the shot.”
Do you mean that there is interlaced artifacts in your movement? You shouldn’t see any difference unless the encoder is doing a terrible job at trying to deinterlace a progressive frame.[Tom Mooney] “The footage that is not deinterlanced looks a bit steppy.”
Was this media created at a different resolution then given to you as 720p? Sounds like whatever did the original deinterlacing did not do a good job or you are not viewing at 100%.[Tom Mooney] “When I compare frames of both movies it appears that the footage that was not deinterlaced looks sharper.”
Sounds like the encoder is deinterlacing something. Usually a loss in sharpness comes from deinterlacing by blending the frames together. Again, I’d look at the original footage in QuickTime.[Tom Mooney] “The output movies are at 2400kbits, 1280 x 720. Is this just a subjective decision?”
This seems a bit low for a visually lossless output but that all depends on which codec you are using. Even with talking head, I usually allocate 5 – 6 Mbps if using QuickTimes H.264 codec. 2400 Kb sounds about right if using CompressHD or the X.264 codec. If you are seeing Macroblocks on your encoded file you may need to bump the bit rate or lower your frame size. I base all of my output settings on Visually Lossless encoding.Do you have any screenshots or clips to share with us? A small sample of the source footage would be great.
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Brian Alexander
Sr Video Engineer
Freeman AVS -
I prefer to export a QT reference file. This avoids tying up FCP and compressor. Because FCP renders each frame of video while exporting straight to compressor, you can’t use FCP until the export is complete. Depending on the length of your sequence, and the codec/quality settings you’re using, this could take a while.
There is no difference in quality with one exception: FCP projects with Motion generated animation will yield higher quality by Exporting using Compressor. I have not tried to find the differences and it makes no sense to me as to why it would have anything to do with quality, it’s just what I’ve heard.
Have you had a look at the FCP manual? It typically has just about all the answers to these types of questions.
If you are able to find solid answers as to which way is better for this reason or that, by all means, let us know.
Thanks.
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Brian Alexander
Sr Video Engineer
Freeman AVS -
Here are some ideas off the top of my head:
1. Make sure that “Share” button is selected under Compressor Services.
2. Make sure that your Shared Cluster storage has a valid path with NO spaces in the name. You should change the name of your Root drive from Macintosh HD to Macintosh_HD. No Spaces! This bug may have been fixed recently but I haven’t updated yet so I’m not sure if a fix has been implemented yet.
3. Reset services (sounds like you’ve already done that).
4. Reset Background Processing. This is in the Compressor Menu Bar under Compressor.
5. Restart your computer.
After resetting and re-Starting Services, does the Stop button immediately appear or does it hang until you restart the QMaster Preference Pane?
Have you already solved your issue?
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Brian Alexander
Sr Video Engineer
Freeman AVS