Re: [Fwd: Re: [Mjpeg-users] [Fwd: yuv4mpeg export feature refinement]]

[Robert W. F. <mic...@co...>]

Anybody know of a good simple binary file editor for Linux that can 
handle 30 GB files without a problem?  If so, I can simply edit the 
YUV4MPEG header to suit me.  By the way, the yuv4mpeg man page is quite 
good.

Robert W. Fuller wrote:

> This should have gone to the list....
>
> ------------------------------------------------------------------------
>
> Subject:
> Re: [Mjpeg-users] [Fwd: yuv4mpeg export feature refinement]
> From:
> "Robert W. Fuller" <arc...@co...>
> Date:
> Wed, 07 Jan 2004 14:08:11 -0500
> To:
> "Steven M. Schultz" <sm...@2B...>
>
>
> Thank you for the reply.  That header looks delightfully easy to 
> edit.  Here's one from one of my transcode exports:
>
>    YUV4MPEG2 W704 H480 F30000:1001 Ip A0:0
>    FRAME
>
> Is the yuv4mpeg man page the best documentation for the header format?
>
> Regards,
>
> Rob
>
> Steven M. Schultz wrote:
>
>>> On Wed, 7 Jan 2004, Robert W. Fuller wrote:
>>>
>>> When you export from a quicktime file to yuv4mpeg, transcode sets 
>>> the frame order to "progressive/none."  This does not work well with 
>>> programs like "yuvkineco" which will not perform de-interlacing 
>>> unless ...
>>
>>
>>
>>     That's a very common problem with programs that have yuv4mpeg2
>>     output - the header fields are rarely 100% correct.
>>
>>> By the way, is there a simple editor for yuv4mpeg headers?
>>
>>
>>
>>     Not directly, but there are a couple approaches one could take.
>>
>>     Write a simple wrapper shell script that does a 'read' to get
>>     the first line - parse it out and replace the necessary tags, echo
>>     that to echo out, and then pass the rest of the data thru untouched
>>     with cat.
>>
>>     The other approach uses a couple simple utilities (only in the
>>     cvs version of mjpegtools at the moment I believe) in a pipeline.
>>     'y4mtoyuv' to strip out the header and frame markers, and then
>>     'yuv4mpeg' with all the parameters explicitly set.   SLightly
>>     inefficient to go thru a couple process pipeline but it is     
>> simple.   Something like ' ...produce y4m... | y4mtoyuv |
>>     yuv4mpeg -i t -r 30000:1001 -a 10:11 -w width -h height | 
>> mpeg2enc ...
>>
>>     Cheers,
>>     Steven Schultz
>
>
>
>