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 Post subject: Video Playback from devices (LD, VHS etc)
PostPosted: 28 Nov 2021, 19:10 
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do these players like LD players, VCR and modern BD players and the list could go on. Do they output a pure signal which is why sometimes you can use the Television to change the aspect ratio in order to make something that was 4x3 back to 4x3. Or is the signal from the players compromised in a way that we're not fully getting the picture even if we do aspect ratio on the TV
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 Post subject: Re: Video Playback from devices (LD, VHS etc)
PostPosted: 29 Nov 2021, 23:00 
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Well, it's analog video (LD and VCR). So you are not going to get a perfect digital output. But even digital sources such as blu-ray players have varying output quality. As for LD, this is why some players cost more than others. Their video quality output is better.
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 Post subject: Re: Video Playback from devices (LD, VHS etc)
PostPosted: 01 Dec 2021, 16:52 
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why do I have to use aspect ratio to change the picture when I thought it comes out in a 4x3 aspect ratio. Does the TV overscan or something?
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 Post subject: Re: Video Playback from devices (LD, VHS etc)
PostPosted: 01 Dec 2021, 18:17 
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The video on all laserdisc is fixed (but different for NTSC vs PAL). Any change from 4x3 and the standard scan lines is being done by a component further down the chain (ie receiver, TV, scaler, etc...). That can be cropping, stretching, upscaling,...
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 Post subject: Re: Video Playback from devices (LD, VHS etc)
PostPosted: 01 Dec 2021, 23:34 
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xtempo wrote:
do these players like LD players, VCR and modern BD players and the list could go on. Do they output a pure signal which is why sometimes you can use the Television to change the aspect ratio in order to make something that was 4x3 back to 4x3. Or is the signal from the players compromised in a way that we're not fully getting the picture even if we do aspect ratio on the TV


LD and VCR put out a picture that 4X3, so you have to tell you TV how to display that in an area meant for 16X9, Stretch, Zoom, side bars, etc. which are all processing steps inside the TV. Blu-Ray players output 16X9 so it fills the screen. So the answer is the playing unit is specified to output the aspect ratio for the standard size of TV for that country at the time the specification for the format LD/VCR was finalized. LD/VCR has the flyback built into the signal to provide the electronic beam to be returned to the left side to start the next trace across the screen. The NTSC TV's would just sync to the control pulses set out by the players and display the line trace as provided. ALL analog inputs signal worked on this principle.

Digital is a totally different animal and you cannot compare them, it's more of a digital memory where you load a location/position with the desired display output. Digital TV's have to take the analog NTSC and process it to determine what data to send to the memory positions for the display. That is why you find different qualities in how a TV will display NTSC. Cheaper ones just don't invest their money into supporting an old format.
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