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Uncompressed Digital Video vs. Uncompressed Digital Audio

Discussion in 'Electronic Basics' started by Radium, Feb 12, 2007.

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  1. Radium

    Radium Guest

    Bob Myers says in http://groups.google.com/group/
    sci.electronics.basics/msg/bbad436d1cb6cd02?hl=en& :

    "RGB simply means "red, green, and blue" video - it clearly can be
    represented in either analog or digital form."

    Not trying to side with either party or start a battle, sorry if it
    seems that way.
     
  2. "Radium" wrote ...
    "RGB" and "linear PCM" are not two different "format"s.
    Here we go again. Maybe you better define what YOU
    mean by "format"? Do you mean encoding scheme?
    Do you mean codec? etc. etc. etc.

    Else you are likely to start another pointless thread
    where people argue about what you mean. It would
    also be helpful to reveal WHY you are asking so maybe
    we can figure out WHAT you are asking.
     
  3. Radium

    Radium Guest

  4. Radium

    Radium Guest

    What is the most common type of uncompressed digital video? Is it a
    type of PCM format? If not, what is it and why isn't PCM video -- like
    the PCM audio in CDs -- used?

    Basically, I am looking for the "video equivalent" of CD audio.
     
  5. Mr.T

    Mr.T Guest

    If you actually knew what PCM was the acronym for, you might realise that
    Arny already mentioned other schemes.
    Just because they are not as common, doesn't mean alternate schemes do not
    exist.

    MrT.
     
  6. "Radium" wrote ...
    That is because "PCM" is an archaic name for "digital".
    (PWM/PDM were similar archaic terms/schemes.)
    It was coined at Bell Labs when digital audio was first
    implemeted as a lab experiment. It has no practical
    meaning today and causes more confusion than just
    using the proper modern term.
     
  7. Mr.T

    Mr.T Guest

    It would be nice if there was one single video format as common as CD audio
    I guess. The nearest equivalent would obviously be standard DVD, MPEG-II,
    but unfortunately you still have the country dependant format variations for
    frame size and frame rate etc.

    However even PCM audio you first asked about, comes in a lot more formats
    than 16/44.1 CD audio you now mention, so they are not that dissimilar after
    all.

    MrT.
     
  8. Mr.T

    Mr.T Guest

    Not so. They are all more specific descriptions of the digital coding used.
    "Digital" is simply a more generic term.
    It's the same as saying FM and AM are both analog "radio broadcast" methods.
    Some people need to understand the difference, and some don't care.

    MrT.
     
  9. Radium

    Radium Guest

    Um, MPEG is compressed. I was looking for uncompressed digital video.
    Yeah, these days :). There's CDR, CD-RW, CR+RW. I was taking about the
    common audio CDs used in the 80s. Any *uncompressed* digital video
    equivalent of that good ole' 80s CD audio?
     
  10. Mr.T

    Mr.T Guest

    The nearest would probably be the mini DV camera format then. They're pretty
    common.

    MrT.
     
  11. how about the one named "Radium is just a troll jerking our chain"
    a.k.a. Sony SACD. it's not PCM. sometimes it's called "PDM".

    you must really think other people are stupid when it is you that is.

    r b-j
     
  12. What does "type" mean in your world?
    By "common" do you mean historic or current?
    It is likely not defined that way because PCM is usually
    used to refer to audio, not video.
    What does "PCM video" mean in your world? Does it
    just mean "digital video"?
    D1 & HDCAM SR were uncompressed component digital video formats.
    D2 and D3 were uncompressed composite digital video formats.
    All were tape formats, and none was terribly popular nor
    did they last very long.

    There are some high-end schemes for recording uncompressed
    video used in digital cinematography. I believe they are all
    hard drive-based, not tape or optical.

    The SDI digital video interconnection scheme used in
    broadcast facilities has at least one mode that will
    transmit uncompresed (4:4:4) video.

    Putting true 4:4:4 uncompressed video on a 4.7 GB DVD
    would give you about 4-5 minutes of playing time. (Assuming
    you could spin the disc fast enough to read the data in real-
    time) Perhaps that is why it never caught on. :)
     
  13. the difference between those different video compression formats is
    roughly analogous to the difference in the various audio compression
    formats that you claim are "all PCM". so i guess all video is PCM,
    from your definition.
    like VHS? or, maybe if you look hard, Beta-max?

    r b-j
     
  14. "Radium" wrote ...
    CDR, CD-RW, CR+RW are writing formats. They have nothing
    to do with audio except that one of their many uses is to
    make either data discs with audio files on them, or to burn
    "Red Book" audio CDs.
    The "common audio CDs" used today are identical to the ones
    from the "80s". Do you think there is some difference?
    Certainly not in the consumer arena and very rare in the
    professional one.
     
  15. DV (and mini-DV and DVCAM and DVCpro25)
    are compressed 5:1
    DVCpro50 is compressed 2.5:1
     
  16. Thanks for making my point.
     
  17. Radium

    Radium Guest

    How do these video discs looks like? Are they bigger than CDs? Do they
    use uncompressed digital video? If so, where could I possibly find
    these treasures?
     
  18. Radium

    Radium Guest

    Hm. Maybe using a bigger disc [about the size of 33-speed phonos] and
    400 nm recording/playback lasers [instead of the dirty old red lasers]
    would solve the above problems.
     
  19. "Radium" wrote ...
    Sony XDCAM HD. Don't try to read the price while standing.
     
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