[MEncoder-users] Convert webm to any other format

[Paul Brauner]

On Tue, Oct 23, 2012 at 7:27 AM, Reimar Döffinger
<Reimar.Doeffinger at gmx.de> wrote:
>
>
> On 23 Oct 2012, at 00:24, Paul Brauner <polux2001 at gmail.com> wrote:
>
>> Hello,
>>
>> I've used cheese (http://projects.gnome.org/cheese/) to record a small
>> video with my webcam. I shouldn't have in retrospect but that's too
>> late, I can shoot it again :) So it outputs webm files by default.
>> When I try to use this video in kdenlive I get very weird behaviours
>> (like, the video jumps to random frames). So naturally I've tried to
>> convert it to another format. That's where trouble begins.
>>
>>  - When I read the video with mplayer it displays
>> http://pastebin.com/cuZRpkHn (notice the 1000fps). The video plays
>> just fine, at the right framerate. When I press "o" I see that it
>> lasts 2:50 min.
>>
>>  - If I execute "mencoder -oac copy -ovc copy  myvideo.webm -o
>> myvideo.2.web" I get a lot of "duplicate frames" messages
>> (http://pastebin.com/dA7TR2rZ. The resulting video plays fine although
>> now "o" says it lasts 2:49 min. kdenlive is still not happy with it.
>> Mplayer still displays 1000fps.
>>
>>  - Same exact thing if I execute the same command with "-idx".
>>
>>  - If I execute the command with "-fps 12", I get a duration of
>> 2:52min and the video features mostly artifacts (it looks like a
>> mosaic).
>
> I'm not sure you are looking at the right place for the issue, but -fps s for speeding up/slowing down video, -ofps is for selecting the output frame rate.
>

Yes, I figured that out by trying avconv instead and enabling the
equivalent of -ofps "by mistake" since their -fps flag applies to the
output. Then it worked in kdenlive and I realized what kdenlive didn't
like was the unspecified fps (or the 1000fps, I guess it's a default
value).

>> At this point I'm a bit desperate: mplayer plays it just fine but I
>> can't convert it into a file that plays the same way (and even less to
>> a file that kdenlive likes). Is there a way to say "dump what mplayer
>> displays in a raw file"? (I don't care for sound). If not, do you have
>> an idea what to look for?
>
> MPlayer -vo yuv4mpeg is intended for that. -vo png might work as well, if you do not mind losing the exact timing information.

Good to know, thanks!

Paul

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