Decompression of AVCHD?

Hey guys,.

I recently bought a Panasonic Lumix DMC-ZS19K of 220,00 (great deal!) and it records AVCHD 1920 x 1080 60 p at 28-30 Mbit/s throughput. The quality is not bad, I like to just work with files uncompressed as YUV 4:2:2, etc. Given that I have download on YouTube, which compresses like crazy, I want to keep crisp image that I receive on my monitor on YT so... Now, I understand that AVCHD uses an exclusive algorithm to compress the data so he can write it on a standard SD card. I want to decompress the video in an uncompressed format (opposite of compression), but various google searches resulted in answers 2008-old ish.

If there is anyone of you who knows how to unzip compression on CS6 (I bought the master collection... expensive), please share the info.

As for my material, I'm an avid player, so my PC serves a double purpose when editing PS I use windows 7

Here is my card

Intel 3770 K @ watercooled 5.2 Ghz by rad 360mm XSPC (more than 24 hrs of O.C to get here)

16 GB MEMORY DDR3 @ 1866

ASRock OC formula Council

4 x 1000 GB Carviar Black drives in RAID 0 @ 420 reading / writing of 380

ASUS GTX 560 Ti (in the reading Mercury engine config)

LSI 9207-8i RAID card

4 x 830's Samsung 128 GB RAID 0 reading seq: 2014 mb/s write Seq: 1228 MB/s


I thought that the compression worked as a .zip or .rar file.

It depends on the type of compression used.  Zip and RAR are lossless, which means that you can reproduce the original, exactly as it was.  There are methods to video compression without loss, such as Lagarith and UT codecs, but AVCHD (or whatever it is based MPEG) is not one of them.  Even ProRes and DNxHD are not lossless.

Now, the reason why it is important to understand is that you don't see a compressed video signal.  It must be unzipped for you to see.  PP decompress each image as it shows.  A reader DVD or Blu - ray will do the same.  Windows Media Player and QuickTime Player, the Flash player on the web page of YouTube, all decompress the video so you can see.  And despite claims to the contrary, only give you pouvez was rejected during compression, you need to put back in order to see the image.

The question is how precisely it is given.  With the lossless compression codecs, it gets delivered exactly as it was originally, without alteration.  With lossy as AVCHD compression codecs, there are always errors to recreate what was rejected during compression.  These errors are called artifacts.

Here's the point I'm getting at.  Once the image is compressed using a codec like AVCHD, these artifacts of decompression are will appear if PP he unzips for viewing or another program unzips into a new uncompressed file.  You can't avoid it.  There is not enough data to restore the image without errors, any hardware or software does the work of decompression.  That's why people say there is no need to turn your AVCHD in uncompressed for editing.  Errors will be displayed without worrying.  All you do by converting is waste time and disk space.

Working with uncompressed YUV 4:2:2 is a good idea, but unfortunately it is not a camera on the market that can do it.  The only 'exception' could be the new movie camera in black magic, that allows to record RAW CinemaDNG lossless files.  But it is an expensive proposition with a headache of a workflow.  Other that that, each camera there compresses the video somehow, throwing data causing errors appears when decompressed.  Even the cameras RED is using Peter Jackson for The Hobbit are not fully lossless.  Of course, mistakes are likely to be so small and insignificant that no one will ever see them.

While the AVCHD codec will generate more errors than Redcode RAW, it is still a fairly clean codec set.  Errors are likely to have escaped most of the people in most situations.  So, for your shipments of YouTube, you're fine just using AVCHD camera media.

Tags: Premiere

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