[MPlayer-users] create thumbnail problems

[Kevin DeKorte]

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On 11/28/2011 04:15 PM, Reimar Döffinger wrote:
> On Mon, Nov 28, 2011 at 08:08:00AM +0000, Shixinpeng wrote:
>> Hi, I have mplayer on my SUSE Linux Enterprise Server 10
>> (x86_64).I have a problem using a command line that uses mplayer
>> to create thumbnail of video. This is the command: ./mplayer -ss
>> 00:01:34 -noframedrop -nosound -vo jpeg -frames 1
>> /home/sxp/heikediguo2.ts But I got a snapshot with mosaics, which
>> is named mosaics.jpg in the attached file snapshot.rar. So I used
>> another command to solve the mosaic problem. ./mplayer -ss
>> 00:01:34 -demuxer lavf -vf screenshot -vo jpeg -lavdopts
>> skiploopfilter=all:skipframe=nonkey -nosound -frames 2
>> /home/sxp/heikediguo2.ts However the first snapshot is gray,
>> which is named gray.jpg in the attached file. Any ideas? I
>> appreciate any help. Thanks!
> 
> Well, I would assume that will happen when the first frame is not
> a keyframe and you specify skipframe=nonkey. You want -lavdopts
> wait_keyframe If your MPlayer version doesn't support it best
> compile yourself.

You may want to look into an existing project like my
mplayer-video-thumbnailer aka nailer project.

http://code.google.com/p/mplayer-video-thumbnailer/

If you want to provide any patches to that project, I would be glad to
work with you.

Kevin


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