[X4U] Video size

[Brett Conlon]

Ahhh, I see. Yes, if you’re talking the same file size for both videos at different resolutions, then the HD file would likely be much poorer quality for it to result in the same file size.

Coj


On 11 Mar 2014, at 3:24 am, Jim Elmore <jelmore at elmoredesign.com> wrote:

> When I mentioned video quality, that was about compression and motion rendering as opposed to display size. A 640x360 would be enlarged 3x to match a 1920x1080. The 1920x1080 would have 9x the compression and somethings got to give! All of this is talking about files that are the same size (same bit rate). Doubt one would ever render something at 1920x1080 with a low bit rate. 
> 
> 
> 
> On Mar 9, 2014, at 5:29am, Brett Conlon <brettnlis at bigpond.com> wrote:
> 
>> But that’ll depend on the device it’s being viewed on. If it’s a 1080i or p display (eg. HD TV) then the 640x360 should look poorer in quality.
>> 
>> Coj
>> 
>> On 9 Mar 2014, at 6:10 am, Jim Elmore <jelmore at elmoredesign.com> wrote:
>> 
>>> The 640x360 will be higher quality (less compression, soother motion), but smaller physical size.
>>> 
>>> 
>>> On Mar 8, 2014, at 1:07pm, Neil Pollack <lists at mac.com> wrote:
>>> 
>>>> Which one will be higher quality?
>>>> 
>>>> On Mar 8, 2014, at 11:51 AM, Jim Elmore <jelmore at elmoredesign.com> wrote:
>>>> 
>>>>> Just fyi, I've found that bitrate controls file size. A 30 frames per second 30 second video at 1920x1080 or at 640x360 at 1 megabits per second will both be very nearly the same file size. The difference will be in the video quality.
>>>>> 
>>>>> 
>>>>> On Mar 7, 2014, at 11:00pm, Brett Conlon <brettnlis at bigpond.com> wrote:
>>>>> 
>>>>>> Just remember that it’s not only about size. The conversion to WMV may be dramatically dropping the quality. If you’re OK with what you’re seeing with the conversion to WMV first (then to MOV) then you have a workaround. BTW, you could probably achieve the same thing going straight to MOV if you know why the codec and bitrate is.
>>>>>> 
>>>>>> Coj
>>>>>> 
>>>>>> 
>>>>>> On 1 Mar 2014, at 1:48 am, Paul Moortgat <paul.moortgat at pandora.be> wrote:
>>>>>> 
>>>>>>> I could reduce the size in half by making it a WMV file and then a Mov file again.
>>>>>>> 
>>>>>>> Paul Moortgat
>>>>>>> 
>>>>>>> On 28 Feb 2014, at 11:22, Conlon Brett wrote:
>>>>>>> 
>>>>>>> I'm a little rusty but it comes down to the compression used & bitrate (how much information is used to represent each frame). Similar with say a TIFF vs JPEG image. They might be same number of pixels wide by deep but the jpg will be much smaller & probably poorer quality.
>>>>>>> 
>>>>>>> Cojcolds
>>>>>>> 
>>>>>>> Sent from my iPhone
>>>>>>> 
>>>>>>>> On 28 Feb 2014, at 21:01, Paul Moortgat <paul.moortgat at pandora.be> wrote:
>>>>>>>> 
>>>>>>>> I made (with my camera) a HD1080 movie of 11 minutes which was 1.5 GB large.
>>>>>>>> I downloaded a HD1080 movie of 45 minutes from Youtube which was around 750 MB large.
>>>>>>>> They both are in 1080.  Why is there such a difference in size?  They're both .mov files at the end.
>>>>>>>> Four times longer and half in size makes no sense to me.  Mov is mov isn't it?
>>>>>>>> 
>>>>>>>> Paul Moortgat
>>>>>>> 
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