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AUTHOR SUBJECT: Digital compression
Velusion
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Posted: 6/18/2016 7:38:54 PM
Today I ran some tests with a quadcopter that I just purhased.  It's the Typhoon Q500.  It comes with a nice 4K video camera mounted on a 3 axis gimbal... The video quality is wonderful.. I can't ask for more from a copter/camera in the $1000 copter class..  I put together a video of some of the clips I shot. I wanted people to see how good the camera is so I tried for some compression that would maintain most of the quality of the raw video which is MP4.  I tried to pattern my compression after the compression that was used on a movie that I have on my hard drive (Lion Heart with Jean Claude Van Damme).  The copy I have used  the H.264 codec.  Screen resolution of 1280x688, 23 fps . A bit rate of 1229mbps.  Audio,  125 kbps 44kHz.....  The movie looks fantastic!

The problem is that my video shows serious compression artifacting and I don't know why.  I tried upping the bit rate. Increasing the number of I framesfrom 1 every 90 frames to 1 every frame (1 every frame looks terrible).  I tried running a 2 pass VBR (I didn't try a Constant bit rate)...  I don't seem to be able to do anything to export the timeline in Premiere to a good copy.  There are other codecs available that produce good copies along with hugh file sizes... Lion Heart is and hour and 50 minutes but only 974 meg.  That's about 8.8 meg a minute.  I can't produce a good copy with such a small file size... Any ideas?

Here's the video http://www.morphicmotion.com/q/q500.mp4


REPLIES:   31

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Posted: 6/18/2016 9:07:55 PM
By the way; with the I f rames.  I tried a bunch of different ratios; 1 every 6 frames, 1 every 12, 24, 30,,,,,,,
Sv Bell | Black Flag Pictures
Sv+Bell
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Posted: 6/19/2016 10:57:01 AM
I guess this is why there are encoders worth $50k and others $50.
I ran into similar problem a while ago, and I found that the problem was with adding compression over an already compressed video. I converted my video source to uncompressed format (thought it obviously doesn't increase source quality), and then re-compress that file.

It seemed that stripping out the initial, source codec before applying a new one did the trick.

Velusion
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Posted: 6/19/2016 3:57:43 PM
I'll give that a try and see what happens.  Thanks for the tip :)

Sv Bell | Black Flag Pictures
Sv+Bell
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Posted: 6/19/2016 4:21:32 PM
 See what it does with a short 5-10 seconds segment. Exporting a full 4k video might be time-consuming...!!
Mike Conway
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Posted: 6/21/2016 5:21:13 PM
 Compression talk aside, I enjoyed your aerial footage!
Velusion
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Posted: 6/23/2016 5:23:28 AM
Thanks Mike! ... Oh, by the way, the kit that I purchased has a hand held device that you can hook the camera onto so that you can use it separate from the copter. You get full gimbal support and rotation of the camera while in this configuration. It's like having a Steadycam!
Mike Conway
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Posted: 6/26/2016 12:48:49 AM
I've seen something close to that steadicam handle.  DP, Pat Kerby, demoed the DJI Osmo at IndieMeet.  Incredible!
mokkimachi
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Posted: 6/29/2016 11:49:34 AM
Very uplifting!  Range?


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Posted: 7/1/2016 8:26:36 AM
Too far to see.


Mike Conway
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Posted: 7/1/2016 5:03:37 PM
 Just watched a couple of Youtube videos of this drone.  One had the copter go up over 2,000', and the other had it at 1,500', travelling a half mile away.  Pretty damn good.

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Posted: 7/2/2016 8:58:28 AM
I'm very pleased with this copter.  It cost about $900 but the quality is there!  It came with a large aluminum carrying case on wheels too.  I recently purchased a set of blade guards to keep from breaking the blades during bad landings or when you get too close to a tree and hit a branch. If you watch my video, during the take off you can see that I did clip a tree branch but got lucky. It kept on going..  The blades break easily but I think they were designed to so that you don't damage the motors should they suddenly stop while under power. The camera has a wide angle lens that has very little distortion.  It came with one UV filter but you can buy ND filters if you want. You can switch from HD to 4K via the remote control... One thing that is very cool is that I can plug the copter into my computer to change some of the settings and also to run diagnostics on the electrical components, including the motors...  I had to register the thing with the FAA because it weighs more than half a pound.  It only cost 5 bucks. You pay the money and you get a number to put on the copter.. It's not copter specific.  When you register, you're actually registering yourself.  You get one number that you have to put on as many copters as you have. It just identifies the thing to you should you lose it or crash it into something ,, or if someone captures it while you're filming your neighbor's wife tanning in the backyard hehehe...  If anyone needs some footage from a Utah location, I'd consider shooting it,,,, for free of course...

mokkimachi
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Posted: 7/2/2016 11:18:58 AM
I'd like that.  

Does it pilot easy?



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Posted: 7/2/2016 2:04:26 PM
Sure thing....

This as actually my 4th quadcopter.  I wrecked the first 3 :)

Mike Conway
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Posted: 7/3/2016 12:24:30 PM
 I noticed that you swiped the tree branch and I thought it was on purpose.  Wow, what happened to the other 3?  None could be fixed?

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Posted: 7/3/2016 1:42:34 PM
Well, I'll start by saying my head was in the right place.  The first one was a cheap $50 model.. It was as primative as they come. So sensors of any kind.  A very good pilot might have been able to control the thing but I chose it for its price.  It was light weight too. I mild breeze would take it away..  I finally snapped the arms off of it by running into houses too many times. There was a very good one that had called the H8.  It only cost 15 dollars but it was not that diffecult to control and it really took a beating.  Eventually the motors burn out on the cheap ones.  You can get new motors but what's the point. They're meant to be disposable..  The third one I had was bigger and heavier than the others.  One of the motors burned out on it on the 2nd or third flight.  I bought new motors and fixed it up but a few weeks later, the control board burned out.. I trashed it... So, I guess I didn't really wreck these things as much as they were cheap and just waiting to break.. The one I have now is more professional. Stronger.  Made to last.  It cost about 3 times as much as the all 3 of the other copers I had.  I really like this one a lot.  I highly recommend it.

mokkimachi
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Posted: 7/4/2016 9:26:42 AM
So James, what movie is it you're making that you got this stuff for?


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Posted: 7/5/2016 3:53:44 AM
I'm taking a final shot at making a feature.  I've tried several times over the past 14 years but always failed, primarily because of my own doubts and lack of faith in myself..  I've been doing a lot of reading about the mind and how we, as people, set ourselves up for failure... Anyway, yeah, a feature.  I know that the way the film industry is now compaired to 10 or 20 years ago makes it seem very unlikely that an indie feature will make any money or even be seen by more than a handfull of people but at this point, I just want to do it.  I don't want to become an old man filled with regret for not doing the one thing I wanted to do more than anything else in this world..

It's a human drama wrapped in a horror story..... the movie I"m making I mean. Not my life :)


mokkimachi
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Posted: 7/5/2016 2:02:26 PM
You idealise a lot.  Just make it. 



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Posted: 7/5/2016 3:42:02 PM
Marius?.... I was wondering what happened to you... I think I still have one or two of  your DVDs...  Still wrestling baboons?

Mike Conway
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Posted: 7/6/2016 12:15:12 AM
That was a pretty epic post. Lots to digest. 😊

Posted From A Mobile Device

mokkimachi
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Posted: 7/6/2016 11:18:52 AM
Good to see you.  

Sv Bell | Black Flag Pictures
Sv+Bell
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Posted: 7/6/2016 12:24:53 PM
Haha yeah, epic is the word!  :-)
Good motivational speech Kevin!

All I can say is, James, just do it. Do it for you. Don't think about audience, fans, festivals, do it for you. Making a feature may sound like a mountain, but see your feature film as a series of short films. Once you've shot the series of short films, rename that as 'scenes'. Stitch together and voilà.  :-)


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Posted: 7/6/2016 12:58:40 PM
Sv, things are already in the works..

Marius, I watched some of the material you have on your site.  I knew it was you just by the style it displays.  It's unmistakably you.

Well, this thread is about as far away from a discussion about digital compression as it can get.  Time to move on...

mokkimachi
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Posted: 7/6/2016 11:13:09 PM
James already made a movie called Beneath The Full Moon.  I liked it but lost it in a flood.  He can make films.



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Posted: 7/7/2016 6:53:23 AM
I always thought  you were one of the most creative people here at Indieclub.  You're  course and strange but I do like that very much.

In the copter video, at the end, I'm standing next to my car with my youngest son, Alex.  Alex is the star of Beneath the Full Moon.  He's 27 now..

mokkimachi
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Posted: 7/8/2016 12:53:48 AM
I recognised him, you had him with Sarah.  Does he still play piano?

If you didn't kill yourself off in BTFM you could have made a sequel. 




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Posted: 7/8/2016 3:51:12 AM
Funny you should mention a sequel.. No. There are no plans for one BUT, I've already talked to my German/Asian slurrys and we plan on doing one final scene for the film.  Fade to black, beat, "15 YEARS LATER..." fade in, Alex is laying on his bed watching a Youtube video.  KEITH walks in.  "Alex, you still have my Star Wars video game."  ALEX: " you still owe me five dollars"....  I walk in with a large scar and think stitches around my neck. DAD: "what are you two talking about?"     .....  Something like that..  The scene references an earlier scene in the movie where Keith wanted his video game and Alex wanted his 5 dolloars for it...

As for Sarah,  We are divorced.  I married a latina chick from Panama.. We've been together for 4 years.

Yes, Alex still plays the piano. 

mokkimachi
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Posted: 7/9/2016 12:23:41 AM
You do that. 




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Posted: 8/1/2016 8:18:12 PM
Marius, you expressed  your concern for me committing suicide 3 or 4 times so far.  What gives?

mokkimachi
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Posted: 8/2/2016 12:58:02 AM
Suicide is just not good, s'all. 


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Posted: 8/2/2016 10:38:50 AM
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