an unsolved mystery on video ratios.

Discussion in 'Amateur Video Production' started by Brian, Apr 11, 2013.

  1. Brian

    Brian Guest

    I have a recording on a DVD that was recorded by a digital video recorder
    in the VR format. When I play the recording on my DVD recorder then the
    recording appears on TV in the 16:9 ratio which is the correct ratio. If I
    play the DVD on my computer directly from the DVD then the recording
    appears in the 4:3 ratio format. Why is this?
    Is there some signal sent to the TV to tell it to display the video in the
    16:9 ratio or maybe the pixel ratio is not being sensed by the computers
    playback program?
    Sony Vegas Pro can convert the files on the DVD-VR into mpg files but they
    still playback in the 4:3 format on the computer. If I transfer these mpg
    files to a flash drive and try to play them back on the TV then they appear
    in the 4:3 ratio which is wrong.

    Any suggestions on why this is happening would be welcome thanks.
     
    Brian, Apr 11, 2013
    #1
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  2. Brian

    Paul Guest

    http://en.wikipedia.org/wiki/DVD-VR

    "16:9 and 4:3 material may be mixed within a single file with
    the display switching correctly (where supported)."

    "Unlike standard DVD-Video recordings, the aspect ratio (4:3 or 16:9) is
    contained in the .VRO file itself as part of the video stream. Thus
    DVD-VR supports mixed format presentations within a single .VRO file.

    Contrast DVD-Video where the aspect ratio is coded into the accompanying
    .IFO file and thus a single .VOB file can be in a single aspect ratio only.

    VRO is a container format for multiplexed audiovisual content. VRO file is
    an equivalent to a collection of DVD-Video VOB files. If one doesn't care
    about any edits (e.g., deleting of recorded videos), one can play the VRO
    directly as if it was a standard DVD-Video VOB file."

    I wonder if there is any tool that can convert a single huge .vro
    file to a set of .vob/.ifo files ? And preserve the info, in case
    some other tool flow is not preserving the info.

    Do a search against the videohelp.com site, to find more on the subject.

    In your search engine, that would be something like this, to
    find more threads on the topic:

    site:videohelp.com vro to vob

    *******

    In this example, you can see some info about a particular VRO file.

    http://forum.videohelp.com/threads/195555-DVD-RAM-disks-and-VRO-to-VOB

    "VR_MOVIE.VRO
    Mpeg 2 Program Stream File [Video/Audio]
    Muxrate : 10.08 Mbps
    Estimated Duration: 26:59.51s
    Aspect ratio 4/3 (TV)
    Interlaced, chroma format: 4:2:0
    Video Format: NTSC
    Display Size [720 x 480]
    Size [704 x 480] 29.97 fps 9.56 Mbps
    Audio : Mpeg 1 layer 1
    free bitrate 44100 Hz
    Stereo, No emphasis"

    See if you can get that information from your file.

    HTH,
    Paul
     
    Paul, Apr 11, 2013
    #2
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  3. We have decided to shoot everything in Hi Def to eliminate all these
    problems. When you do that, it plays correctly on a Hi Def TV, and if you
    convert it to SD in widescreen, it will play on a regular TV as a letterbox
    image, or on a widescreen TV as filling the screen even tho it is SD. Always
    displays at correct aspect ratio for all clients.

    Gary Eickmeier
     
    Gary Eickmeier, Apr 12, 2013
    #3
  4. Brian

    Brian Guest

    Thanks Paul and Garry.

    My aim is to transfer a video recorded to a digital video recorded to a
    file. For example if I go away for a few days I like to catch up on some TV
    programs I have not seen
    Vegas does a good job at converting the file to mpg but the 16:9 file
    becomes a squished 4:3 file.
    I can adjust the file so it becomes a 16;9 file using a video converter but
    there seems to be a lot of video quality lost.
    I have a feeling that Sony Vegas Pro converts a 4:3 file back to 16:9 but I
    have not found where this feature is.

    Thanks for directing me to the information on this Paul. There seems to be
    some signal to tell either the player or TV to show the video in 16:9
    format. This signal is lost when Vegas converts the file to mpg.
    There is a IFO Edit program for sending the correct signal for the 16:9
    display but this would only be useful if the video is played back on a DVD.

    Regards Brian
     
    Brian, Apr 12, 2013
    #4
  5. ZOUNDS! It sounds like a PLAN! 8^)
    (And a good one, at that...!;-)
    --DR
     
    David Ruether, Apr 12, 2013
    #5
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