Difference/Relationship among encoding, re-encoding & decoding?

[iqbal88]

Dear my expert friends,

Pls discuss here the real Difference or Relationship among encoding, re-encoding & decoding

[hech54]

encoding, re-encoding & decoding

Pick one.

[jagabo]

Encoding: compressing a video
Decoding: decompresssing a video
Reencoding: compressing an already compressed video (ie, decompressing and re-compressing)

[iqbal88]

Encoding: compressing a video
Decoding: decompresssing a video
Reencoding: compressing an already compressed video (ie, decompressing and re-compressing)

Pls elaborate more specifically if you can, not in a summarize form my Brother

that's why i can easily understand the terms, it's till ambiguous to me

Thanks for your response

[jagabo]

I don't understand what you're asking.

Compressing: to make the video (file size) smaller
Decompressing: undoing that compression to make the video viewable again, or to modify it

Are you looking for a complete explanation of digital imaging and compression techniques?

[T_Jet]

Dear my expert friends,

Pls discuss here the real Difference or Relationship among encoding, re-encoding & decoding

This question, and the question you asked in this thread https://forum.videohelp.com/threads/338031-Difference-Between-1-pass-2-pass-encoding, look like you are trying to get an answers for a course assignment.

If you ask specific questions you'll tend to get specific answers. If you ask general questions, that have been asked many times before, then don't expect people to spend time writing detailed answers.

I suggest you do your own research as there is plenty of information available. When there are specific things you don't understand post a question and you'll find there are plenty of people willing to help.

The more you can help people answer your question the more likely it is you will get the answer you're looking for.

[edDV]

Start here
http://en.wikipedia.org/wiki/Codec

[iqbal88]

I don't understand what you're asking.

Are you looking for a complete explanation of digital imaging and compression techniques?

I actually want to know:

* What happen in Video Encoding?

* Similarly what happen in Video Decoding?

* And what happen in Video Re-encoding?

Which one is require when?

[iqbal88]

Dear my expert friends,

Pls discuss here the real Difference or Relationship among encoding, re-encoding & decoding

This question, and the question you asked in this thread https://forum.videohelp.com/threads/338031-Difference-Between-1-pass-2-pass-encoding, look like you are trying to get an answers for a course assignment.

If you ask specific questions you'll tend to get specific answers. If you ask general questions, that have been asked many times before, then don't expect people to spend time writing detailed answers.

I suggest you do your own research as there is plenty of information available. When there are specific things you don't understand post a question and you'll find there are plenty of people willing to help.

The more you can help people answer your question the more likely it is you will get the answer you're looking for.

you are right my brother.

And thanks for your nice suggestion.

[jagabo]

* What happen in Video Encoding?

Uncompressed video is compressed.

* Similarly what happen in Video Decoding?

Compressed video is decompressed.

* And what happen in Video Re-encoding?

Compressed video is decompressed then compressed again.

Which one is require when?

Encode when you want to make the video (file size) smaller.
Decode when you want to watch an encoded video, or change it.
Reencode when you want to make an encoded video even smaller, or want to make changes to it and make is small again.

You're basically asking somebody to write a book about digital image/video compression for you. There are many books about that already. Go read one. Then come back with specific questions if you have any.

http://en.wikipedia.org/wiki/Image_compression
http://en.wikipedia.org/wiki/Video_compression
http://en.wikipedia.org/wiki/Run-length_encoding
http://en.wikipedia.org/wiki/Huffman_coding
http://en.wikipedia.org/wiki/Discrete_cosine_transform
http://en.wikipedia.org/wiki/Motion_compensation

[Case]

* What happen in Video Encoding?
* Similarly what happen in Video Decoding?
* And what happen in Video Re-encoding?
Which one is require when?

In the most broadest sense, encoding is storing information in code. To find out what was stored, you have to decode what was encoded.

The term video encoding is very often used as synonym for video re-encoding, except for what happens inside a camera. I think even saving a movie in an uncompressed format can be called encoding.
Every time a movie is played or re-encoded, it has to be decoded first.
Imho, the amount of compression has very little to do with re-encoding, although the goal of more compression needs re-encoding.

Converting between movie formats would be re-encoding (e.g. XviD to DVD, or vise versa). Even (full) re-processing with the same input codec as output codec would be re-encoding.
Storing DV video in a camcorder would be just encoding the movie.
Playing a movie requires decoding.
Re-encoding requires decoding before encoding again.

[iqbal88]

* What happen in Video Encoding?

Uncompressed video is compressed.

* Similarly what happen in Video Decoding?

Compressed video is decompressed.

* And what happen in Video Re-encoding?

Compressed video is decompressed then compressed again.

Which one is require when?

Encode when you want to make the video (file size) smaller.
Decode when you want to watch an encoded video, or change it.
Reencode when you want to make an encoded video even smaller, or want to make changes to it and make is small again.

You're basically asking somebody to write a book about digital image/video compression for you. There are many books about that already. Go read one. Then come back with specific questions if you have any.

http://en.wikipedia.org/wiki/Image_compression
http://en.wikipedia.org/wiki/Video_compression
http://en.wikipedia.org/wiki/Run-length_encoding
http://en.wikipedia.org/wiki/Huffman_coding
http://en.wikipedia.org/wiki/Discrete_cosine_transform
http://en.wikipedia.org/wiki/Motion_compensation

Many thanks to U my brother

[iqbal88]

[QUOTE=Case;2100614]

* In the most broadest sense, encoding is storing information in code. To find out what was stored, you have to decode what was encoded.

The term video encoding is very often used as synonym for video re-encoding, except for what happens inside a camera. I think even saving a movie in an uncompressed format can be called encoding.
Every time a movie is played or re-encoded, it has to be decoded first.
Imho, the amount of compression has very little to do with re-encoding, although the goal of more compression needs re-encoding.

Converting between movie formats would be re-encoding (e.g. XviD to DVD, or vise versa). Even (full) re-processing with the same input codec as output codec would be re-encoding.
Storing DV video in a camcorder would be just encoding the movie.
Playing a movie requires decoding.
Re-encoding requires decoding before encoding again.

Thanks Bro