Posted on 8/8/2017 6:51:00 AM
When selecting recording format in Canon DSLR, there are two options ALL-I and IPB associated with each frame rate. What are they? Let me try to explain the best I could.
Modern video codec compression technology are more complicated than before. They are destructive compression, meaning, data removed cannot be restored 100%.
In the past, video is compressed (remove data) that is within each frame. They are called Intra-Frame (I-Frame) compression. Each frame is like a JPEG photo. File size will be bigger but they are very NLE friendly.
To compress file further more, they decided to put a series of frames into a one compression scheme. It is called "Group of Picture" GOP. With the GOP, some will be compressed by removing similarity of data from the current frame to a few frames back (B-Frame). It also reduce data by predicting how each pixel moves in the next few frames (P-Frame). This is the IPB compression.
It's like this, if you shoot in I-Frame, the GOP is like this
If you shoot IPB, it will be like this
The more B-Frame and P-Frame in the GOP can make the file size smaller.
So what's the impact,. if you load the video to timeline for edit, when you scrub the timeline, the computer will need to reconstruct the current frame by retrieving back a few frames from the current frame, and a few frames from after the current frame. It will cause a toll to the CPU. But now newer computer can handle them all very well.
I shoot IPB. Even tho memory and HDD is not an issue. But the high IO data rate will also have a toll to the overall computer process time. And visually, most people can't tell the difference.
To my understanding, if you need to do a lot of color processing, green screen etc, then shoot All-I . For weddings, I do IPB . its' enough.
Comments on "ALL-I vs IPB"
"i am from Italy hello. Can you help me translate? /rardor..."Posted by rardwat
on 11/30/2019Read More
|Dec 15||Facebook Group Photo Template (1)|
|Dec 1||Great Harddrives Storage Case|
|Oct 20||Cables Required to Record Sound Feed from DJ|
|Oct 12||Should I Offer Wedding Video Raw Footage?|
|Oct 5||Digital Delivery for Event Filmmaker at BVA|
|Sep 29||Awesome RODE PinMic|
|Sep 15||Wedding Film Project Delivered using TakyBox vs Vimeo Pro|
|Sep 6||No More Sandbags|
|Aug 28||External Backup System with Harddrive Dock|
|Aug 8||» ALL-I vs IPB (1)|
|Jul 24||Sole Proprietor, DBA, LLC, S-Corp...|
|Jul 17||Cloud Storage vs Cloud Backup (1)|
|Jun 12||Copyright Infringement Strike|
|Apr 18||Audio Acquisition Comparison|
|Mar 16||Color Tone Of Your Film|
|Jan 8||Backup and Editing Workflow|
|Jan 2||TakyBox V3 Official Release|
|Nov 15||Ditching LP Micro|
|May 3||DVD cover design and DVD label printing (29)|
|Apr 9||Gear Up for Weddings (7)|
|Feb 5||LitePanel LP Micro First Impression|
|Jan 22||Create Softening Effect In Premiere (2)|
|Jan 19||DVD and BluRay Authoring (1)|
|Dec 9||Screen shots comparison of HV20 and GL2|
|Dec 5||BP-2L24H Battery on HV20 Photos (1)|
|Oct 24||Color matching XH-A1 and HV30 (1)|
|Aug 9||Lens Hood for WD-H43 and Raynox 6600 on HV30 (6)|
|Jul 9||Wireless Mics vs Voice Recorders (6)|
|Jul 6||Trayless Removable Harddrive System (2)|
|May 23||Cheap solution to missing LANC (5)|
|May 22||Sample Images with and without WD-H43 Wide Angle Lens|