[Ffmpeg-devel] [Ffmpeg-devel-old] Question about interlaced_frame and top_field_first

[Luca Abeni]

Hi all,

while working on the new video4linux2 input, I tried to design it to
properly set the interlaced_frame and top_field_first fields... How can
I obtain such result?

If I understand well, interlaced_frame and top_field_first are set by
the video codec (CODEC_ID_RAWVIDEO): how can the input format tell the
video codec how to set such fields? I immagine I can modify
raw_init_decoder() to properly set interlaced_frame and top_field_first
in priv_data.pic... But how can it decide if frames will be interlaced
or not? Should I add a new field to AVCodecContext? Or there is a simple
way that I am not seeing?

I am also wondering how such fields are used in libavcodec /
libavformat.
I mean: if I capture video from a bttv card, the video is interlaced but
interlaced_frame is never set (and maybe top_field_first has the wrong
value). What happens if I encode the video (for example using mpeg* with
the CODEC_FLAG_INTERLACED_DCT and CODEC_FLAG_INTERLACED_ME flags set)?
Which kind of problems will I see?


			Thanks,
				Luca
-- 
_____________________________________________________________________________
Copy this in your signature, if you think it is important:
                               N O    W A R ! ! !

 

 

 --

 Email.it, the professional e-mail, gratis per te: http://www.email.it/f

 

 Sponsor:

 Web Marketing: impara tutti i segreti del Posizionamento sui Motori di

* Ricerca, Pubblicita' on-line, Email Marketing ?- clicca qui

 Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=3213&d=27-1


-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems?  Stop!  Download the new AJAX search engine that makes
searching your log files as easy as surfing the  web.  DOWNLOAD SPLUNK!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642
_______________________________________________
Ffmpeg-devel mailing list
Ffmpeg-devel at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/ffmpeg-devel