reducing the quality lost during editing.

Discussion in 'Amateur Video Production' started by Brian, May 31, 2013.

  1. Brian

    Brian Guest

    I read that when editing a photo it is better to convert it to a TIFF file
    before editing it as less quality is lost during the editing. Then save it
    as a jpg or some other format.

    I was wondering if this might apply to a video file if a lower bit rate
    file was converted to a higher bit rate file before it was edited then
    rendered in a lower more suitable video bit rate.?
    Brian, May 31, 2013
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  2. It depends...;-) If you edit the original material directly,
    then retain the original project and source material for
    exporting the various file-types *only once* for each of the
    file types you export (always using only original material
    for a disk file, an archive file [which I do make at a higher
    data-rate than for any of the viewing files in case I dump
    the project and later want a different viewing-file type]),
    etc. - and don't have "sub-file" renders in the edit, not
    making intermediate files then involves only one transcoding
    for most purposes... If you make "sub-file" renders for parts
    of the edit to be used in the final export, and only these
    parts are rendered at a higher data-rate, this also works for
    maintaining overall image-quality at export. But, if you are
    going to make many intermediate renders, it may pay you to
    render all the clips before use as high data-rate as MP4s,
    (I like to use 50Mbps 1080-60P for this and for my archive
    files with 28Mbps 1080-60P originals), as ProRes (with Mac),
    or as some other good intermediate file type. This may also
    serve to make previewing during editing easier - but there
    may then be storage issues with the new much-larger
    intermediate files, and there will also be at least two
    transcoding stages in the work flow instead of one, a
    disadvantage... So, it depends...;-) I prefer to generally
    work with original material (my computer is "hefty" enough
    to make previewing easy with that), transcoding the material
    only once for making each of the export file types (including
    a 50Bmps archive file for possible later use after the
    project has been dumped).
    David Ruether, May 31, 2013
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  3. Brian

    Brian Guest

    Hi David.
    Thanks repliying.
    Do you make your archive file the same video bit rate as the original or a
    higher bit rate than the original.
    Brian, May 31, 2013
  4. Brian

    j Guest

    When working with jpegs, every time you save an image it re-saves, with
    some additional loss (compression artifacts).
    With Vegas, and I suspect almost all NL editors, The source files are
    not resaved. So, the original source files aren't altered.

    There is no point in upscaling, but there are definite advantages in
    using a higher bit rate original.

    j, May 31, 2013
  5. "I like to use 50Mbps 1080-60P [.MP4s] for this and for my
    archive files with 28Mbps 1080-60P originals." 8^)
    David Ruether, May 31, 2013
  6. Brian

    Brian Guest

    That must increase the size of the video file a lot; and as you archive the
    video file at 50Mbps do you use large Terabyte external hard drives?
    Brian, Jun 1, 2013
  7. 2-TB drives are under $100 here in the US, and I have almost 10-TB
    of HD-space - but right now, stills are what are filling my drives
    (I've been "madly" shooting hundreds of photos almost daily for
    a few months during a wonderful late winter and spring...;-). As
    for video, my video "efforts" are generally not very long, and
    I make mostly just the archive files at 50Mbps (which are "only"
    about twice as big per unit of time as the source footage is).
    David Ruether, Jun 1, 2013
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