Thread: The Art of Compression and Encoding

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  1. #1 The Art of Compression and Encoding 
    Senior Member Steve Sherrick's Avatar
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    It's no secret that the web has become a major platform for media distribution at all levels, from sharing home movies on Youtube all the way up the chain to major television shows and feature films. In our little world of media production, one of the things we like to do is share things we've worked on, whether it's a camera test or a finished piece of content. Quite often we struggle to maintain quality, yet keep file sizes manageable. We deal with gamma issues, motion artifacts, banding, etc. I thought maybe we could use this thread to share tips and techniques for getting the most out of our footage when we need to share our video online where it is quite often the wild, wild west. I've reserved some spots here for being able to segment into categories if need be. For Example, so far I have Youtube, Vimeo, Blu Ray, DVD, and Windows Media. As people post tips and techniques, we'll evaluate and then move to these segmented categories so the info is easily accessible when people find the thread.

    I know guys at RED have been very interested in this as well with their adventure with Tattoo, so perhaps they will share anything they have learned as well. I'm doing my own barrage of tests right now with MPEGStreamClip and X264 (latest version) to see how various settings affect things. Going to be a long process but I will make this testing available at some point.

    So, let's have at it. And please, I do ask that we stay on topic. A lot of this is going to be subjective. So, I would suggest we keep it on point as much as possible and try not to let things get off track. Having links to samples, and providing as much detail as possible on how you arrive at settings will go a long way to keeping this on track.
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  2. #2  
    Senior Member Steve Sherrick's Avatar
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    Encoding for the Web
    (Tips from Tom Wong)

    quicktime h264
    whatever your master file is, bring it into premiere cs5 (not straight to media encoder) and export it out of the timeline with whatever quicktime settings. for full res full quality, i never render with max bit depth, but max rendering quality. max bit depth expands the contrast. and for some reason dropping directly into media encoder I've noticed slight differences. but by doing this, i noticed a 0 gamma shift at all, and the colors stay as true as they can getting crammed back into a 8 bit container. from that point on

    Vimeo
    i just upload that highest quality h264 I made. and let vimeo do the job, it produces great results. Also, utilize the Show 1080P in Vimeo.

    youtube
    you can upload pro res, even up to 444 directly to it, and let youtube do the rest of the work.

    basically my mentality, is the Hollywood or even the RED mentality, always start at the highest quality first. so if vimeo only takes h264, i put in the highest quality possible. the whole "you have to throttle the bandwidth before upload" is bull. you just shove the biggest, lowest compressed file you can that's compatible and let their compression do the rest of the work, any lower and the double compression screws you.


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    Senior Member Steve Sherrick's Avatar
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    BLU-RAY, DVD, RED RAY, etc
    (Tips from Tom Wong)
    Blu-Ray
    Adobe Media Encoder all the way. if the piece is short enough, getting the min to max bit rate from 30-35 gives really good results. i use h264 blu ray no mpeg, as it saves on file size and there's no visual difference.

    DVDs
    I use Apple Compressor, i actually use the stock "cram" presets(http://compressorpack.com/index.php). it's pre tweaked and cheap, and has given me the best looking DVDs. i don't use Adobe Media Encoder for that because the aspect always comes out weird, i always get black bars on the left and right no matter what.
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  4. #4  
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    TBD
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  5. #5  
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  6. #6  
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  7. #7  
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  8. #8  
    Senior Member Josh Beadle's Avatar
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    How about we start with a discussion and publicly posted Epic RC Compression from 1:3 up to 1:18 in a test environment. Would love to see where the point of diminishing returns is at acquisition since the cost of SSD are very high and if double the data rate gets nothing visible then it is a waste to record and manage. Lots of anecdotal posts about the subject - have not seen any RC science posted yet. It seems that a conversation about compression should start at the beginning.
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  9. #9  
    Senior Member Steve Sherrick's Avatar
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    Fair enough Josh. I wasn't originally thinking about a Redcode discussion, but I'd be willing to do this test if enough people are interested. The key is to capture a highly detailed shot that also has some movement and some high contrast. Trees tend to be a good candidate. Also worth testing is greenscreen. I can devote a section to this. Thoughts?
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  10. #10  
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    I fully support this thread. I've often wondered how people get such good SD/DVD encodes from HD footage. It's crazy how well that stuff holds up compared to using standard compressor/Adobe Media Encoder presets...

    Hell, a better example, how are apple trailers as good as they look when they're a measly 8.5mbit/s or whatever?
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