[FFmpeg-devel] Issue with Capture between SVN -r8222 and SVN -r8634

Mike Martin Mike.Martin
Thu May 17 12:22:07 CEST 2007


Message: 6
Date: Thu, 17 May 2007 12:51:51 +0300
From: Nikns Siankin <nikns at secure.lv>
Subject: Re: [FFmpeg-devel] Issue with Capture between SVN -r8222 and
	SVN	-r8634
To: FFmpeg development discussions and patches
	<ffmpeg-devel at mplayerhq.hu>
Message-ID: <20070517095151.GA3813 at secure.lv>
Content-Type: text/plain; charset=utf-8

On Thu, May 17, 2007 at 10:45:34AM +0100, Mike Martin wrote:
>Message: 10
>Date: Wed, 16 May 2007 15:08:32 +0200
>From: Luca Abeni <lucabe72 at email.it>
>Subject: Re: [FFmpeg-devel] Issue with Capture between SVN -r8222 and
>	SVN -r8634
>To: FFmpeg development discussions and patches
>	<ffmpeg-devel at mplayerhq.hu>
>Message-ID: <464B0250.7040109 at email.it>
>Content-Type: text/plain; charset="iso-8859-1"
>Mike Martin wrote:
>> An issue seems to have occurred with the v4l capture code between
>> revisions (and still exiists as of yesterday)
>> When ffmpeg starts encoding it resets the following values
>> Norm NTSC
>> Input Television
>Can you try the "-tvstd" and "-vc" options to set the desired video 
>standard and input?
>Also, the attached patch should restore the previous ffmpeg defaults. 
>Can you try it (the patch must be applied over the sources from current

>svn)? I had to post these patches last week, but I got distracted by 
>other issues... Sorry.
>Let me know if there are problems with "-tvstd" and "-vc", and if the 
>attached patch works.
>	Thanks,
>				Luca
>Will try patch when I get home.
>Tried -tvstd - had no effect
make sure you set -tvstd in the BEGINNING in command line.
this is some stupid undocumented behaviour, that isn't self intuitive
for normal users. 

As undocumented by beginning would it be

Ffmpeg -tvstd -f video4linux2 -i /dev/video0 etc


Ffmpeg  -f video4linux2 -i /dev/video0 etc -tvstd

>Didn't try -vc because
>`-vc channel' 
>Set video grab channel (DV1394 only). 	
>(from manpage)


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