Revision as of 16:19, 4 November 2013

Compression & Codecs in video

(File)Format or Container is the shipping box, codec is the goods inside the box.
Format:

determines the way audio and video (and other metadata) are stored inside the file
Examples are :
- .avi (Microsoft -> OLD)
- .wmf (Microsoft -> Unflexible)
- .mov (Apple -> supports a lot of codecs)
- .ogg (Open Source -> but not very well supported by editing software)
- .mkv (Open Source -> but not very well supported by editing software)
- .mp4 (works on virtually all platforms)

Codec:

FYI: Uncompressed HD video = 400GB per hour

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 Format:
 * determines the way audio and video (and other metadata) are stored inside the file
-* examples are : .mov , .avi, .mp4, .wmf, .ogg etc etc
+* Examples are :
+** .avi (Microsoft -> OLD)
+** .wmf (Microsoft -> Unflexible)
+** .mov (Apple -> supports a lot of codecs)
+** .ogg (Open Source -> but not very well supported by editing software)
+** .mkv (Open Source -> but not very well supported by editing software)
+** .mp4 (works on virtually all platforms)
 Codec:
-* the way redundancy in the image is detected and stored
+* Intraframe compression
-* And for video: the way temporal redundancy is detected and stored ->
+** Compresses each frame (with for instance JPG compression)
+** No effective size compression
+** High Quality
+** Easily readable by edit software
+** Apple ProRes, DNxHD (Avid)
+* Interframe Compression [http://www.popmodernism.org/appropirate/delta.html| Looking at delta Frames]
+** Compress BETWEEN frames
+** effective size compression
+** Not easy for edit software
+** Use for sharing -> final output
+** MPEG-2 (DVD's, hardware players), DivX (downloads), H264 (currently has best quality vs. file ratio)
+FYI: Uncompressed HD  video = 400GB per hour
+=== Lossy vs. Lossless ===
 == Tools ==