lut lei

Will I gain anything on compressing my clips, which are old black and white footage, into grayscale photo jpeg?

I'm thinking that it will be only one plane of video in jitter, and therefor higher framerates, or maybe I can step up to 640x320 resolution without to much pain?

grayscale-video

You can even get more cpu gains by choosing the CODEC 'None' with 

this is an 'uncompressed' greyscale movie, the datarate/filesize will 

be higher than photojpeg, but being of limited colordepth/one plane 

makes it quite manageable - (and zero work for the cpu to decompress)

> Will I gain anything on compressing my clips, which are old black 

> and white footage, into grayscale photo jpeg?

> I'm thinking that it will be only one plane of video in jitter, and 

> therefor higher framerates, or maybe I can step up to 640x320 

You can even get more cpu gains by choosing the CODEC 'None' with  
colors set to 256 grays.
this is an 'uncompressed' greyscale movie, the datarate/filesize will  
be higher than photojpeg, but being of limited colordepth/one plane  
makes it quite manageable - (and zero work for the cpu to decompress)

>
> hello
>
> Will I gain anything on compressing my clips, which are old black  
> and white footage, into grayscale photo jpeg?
>
> I'm thinking that it will be only one plane of video in jitter, and  
> therefor higher framerates, or maybe I can step up to 640x320  
> resolution without to much pain?
>
> cheers
> LL
>
>


This cant be emphasized enough. Your codec choice makes all the 

differences in the world. Last night I had accidentally chosen the 

wrong preset to output some test footage and inadvertently choose 

photojpeg @ 100% quality. I wondered why my frame rate was quite low, 

mixing 3 clips should not tax my system. Changing to mjpeg @ around 

75/80 % saved me about 2.5Gb of storage and boosted my framerate by 

Anyway, do some tests, as bandwidth limitation must be balanced with 

compression choices for best performance. good luck.

On Feb 22, 2007, at 10:18 AM, dekam wrote:

> You can even get more cpu gains by choosing the CODEC 'None' with 

> this is an 'uncompressed' greyscale movie, the datarate/filesize 

> will be higher than photojpeg, but being of limited colordepth/one 

> plane makes it quite manageable - (and zero work for the cpu to 

>> Will I gain anything on compressing my clips, which are old black 

>> and white footage, into grayscale photo jpeg?

>> I'm thinking that it will be only one plane of video in jitter, 

>> and therefor higher framerates, or maybe I can step up to 640x320 

This cant be emphasized enough. Your codec choice makes all the  
differences in the world. Last night I had accidentally chosen the  
wrong preset to output some test footage and inadvertently choose  
photojpeg @ 100% quality. I wondered why my frame rate was quite low,  
mixing 3 clips should not tax my system. Changing to mjpeg @ around  
75/80 % saved me about 2.5Gb of storage and boosted my framerate by  
about ... 40 frames per second.

Anyway, do some tests, as bandwidth limitation must be balanced with  
compression choices for best performance. good luck.

> The answer naturally is 'yes'
>
> You can even get more cpu gains by choosing the CODEC 'None' with  
> colors set to 256 grays.
> this is an 'uncompressed' greyscale movie, the datarate/filesize  
> will be higher than photojpeg, but being of limited colordepth/one  
> plane makes it quite manageable - (and zero work for the cpu to  
> decompress)
>
> --deKam
>
>
>>
>> hello
>>
>> Will I gain anything on compressing my clips, which are old black  
>> and white footage, into grayscale photo jpeg?
>>
>> I'm thinking that it will be only one plane of video in jitter,  
>> and therefor higher framerates, or maybe I can step up to 640x320  
>> resolution without to much pain?
>>
>> cheers
>> LL
>>
>>
>

I'm trying to get things right from the beginning now. And using no compression and 256 values of gray is great for archiving purposes, and cpu.

But it seems like jit.quicktime only handles two colorspacesd, ARGB and UYVY. So I guess when I load a movie with only "1 plane", there will still be some conversion going on. So it would be just as clever just to start out with a conventional jpeg video?

I tend to get a bit confused about these colorspace considerations.

But it seems like jit.quicktime only handles two colorspacesd, ARGB and UYVY. So I guess when I load a movie with only "1 plane", there will still be some conversion going on. So it would be just as clever just to start out with a conventional jpeg video? 

I tend to get a bit confused about these colorspace considerations.


grayscale video