[MEncoder-users] compression: 1080i versus 720p

[Jarred Nicholls]

On Thu, Dec 24, 2009 at 12:38 AM, Jarred Nicholls <jarred.nicholls at gmail.com
> wrote:

> On Thu, Dec 24, 2009 at 12:29 AM, RC <cooleyr at gmail.com> wrote:
>
>> On Thu, 24 Dec 2009 00:04:15 -0500
>> Jarred Nicholls <jarred.nicholls at gmail.com> wrote:
>>
>> > I think he's saying that though it's 60 fields per second, that they
>> > are being played back (viewed) at 30 frames per second (perception)
>> > when it is interlaced...and deinterlacing the fields turns the 60
>> > fields into 30 full frames and still is played back at 30 frames per
>> > second.  At least such is the case with any software video player such
>> > as Mplayer.
>>
>> MPlayer is quite capable of playing interlaced videos properly.
>>
>
> Sure it does, but it translates (for example) 59.94 (60000/1001) into 29.97
> (30000/1001), which is what I was saying.
>
> If you playback an interlaced movie and then play it back deinterlaced,
> between any given second you will see 30 frames in both instances.
>
> Jarred
>

Less I forget to mention, that's usually because the header of the video
container specifies a frame rate, so a player like Mplayer knows to take 60
fields and play 30 frames a second out of them.  Deinterlacing those 60
fields will likewise playback with 30 frames.

Jarred


>
>
>>
>> --
>> Ha. I'm the idiot.
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>
>