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  #16  
Old 21st June 2015, 07:38 PM
smr54 Online
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linuxchrome
Re: which Open Source software to edit vdeo?

I have a page that mentions this. There was one app I used, then another with ffmpeg.

http://srobb.net/dvds.html#ScreenCapture (if I understand what you want.)
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  #17  
Old 21st June 2015, 07:59 PM
flyingdutchman Offline
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macosfirefox
Re: which Open Source software to edit vdeo?

I've tried many editors and always goes back to kdenlive.

You can record your desktop with a one liner using ffmpeg. It is in the ffmpeg guide:
https://trac.ffmpeg.org/wiki/Capture/Desktop

You can also use a program called istanbul to record your desktop.

Note that most (all?) desktop record programs are just an overly complicated GUI hiding the above mentioned ffmpeg one liner.
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  #18  
Old 21st June 2015, 08:14 PM
techsupport Offline
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linuxfedorafirefox
Re: which Open Source software to edit vdeo?

Instanbul doesn't work. Gnome has an embedded capture, but no audio, and it automatically stops after a few seconds.

The VLC capture file has no audio and is black.

If anyone can help advise how to use VLC to record the desktop video and audio (in lieu of capturing the stream),
thanks in advance.
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  #19  
Old 21st June 2015, 08:21 PM
techsupport Offline
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linuxfedorafirefox
Re: which Open Source software to edit vdeo?

None of the 3 ffmpeg lines worked on my Fedora 21 system.
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  #20  
Old 21st June 2015, 08:45 PM
flyingdutchman Offline
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macoschrome
Re: which Open Source software to edit vdeo?

Well, you may have to install ffmpeg. If you want to do *anything* with video, then you need it, so go ahead, don't be shy.

You can see if it there with:
$ whereis ffmpeg
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  #21  
Old 21st June 2015, 09:13 PM
smr54 Online
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linuxchrome
Re: which Open Source software to edit vdeo?

I linked above to my page which has a simpler syntax.


ffmpeg -s 1366x768 -f x11grab -i $DISPLAY -f alsa -i default output.mkv

Would you be more specific in what didn't work?
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  #22  
Old 22nd June 2015, 05:35 AM
techsupport Offline
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linuxfedorafirefox
Re: which Open Source software to edit vdeo?

I have ffmpeg for 2 years now, that's not the problem.
It has errors.

but leaving that all aside, I have installed kdenlive and it seems to be working to the point where I have capture files.

But the capture files are black, with no audio.

I just want to capture the video I am playing in the Firefox browser.

Can anyone advise how to link the kdenlive capture to what is playing in my browser?

Many thanks in advance to anyone who has this answer.

If I can get this last step to work, that will be good enough.
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  #23  
Old 22nd June 2015, 06:57 AM
hiGuys Offline
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linuxfirefox
Re: which Open Source software to edit vdeo?

I use recordmydesktop for this. I usually capture the whole screen because I'm too lazy to figure out the offset to capture just the video frame in the browser, but the functionality exists. The audio works as well.
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  #24  
Old 22nd June 2015, 07:40 AM
flyingfsck Offline
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Re: which Open Source software to edit vdeo?

Well, I'm using ffmpeg all the time. It is very good.

Saving a stream is actually very easy. You can tee the stream to disk while it is playing, you can use tcpdump to send the packets to disk, you can use ffmpeg to read the stream and send it to disk, you can use ffmpeg to send the whole screen to disk you can use mplayer to save the stream to disk, you can use streamtuner, or you can play the video with Firefox and then go and troll through the tmp directories to find it - Firefox dumps it somewhere while playing...

Of all the methods, using VLC is prolly the worst, since VLC is very buggy. Using kdenlive to record is simply wrong headed and using mplayer is one of the easiest:
mplayer http://path_to_stream -dumpstream -dumpfile outFileName

and you can do it all at the same time:
https://shkspr.mobi/blog/2011/11/wat...eo-in-mplayer/

You can also do the same with ffmpeg and ffplay.

However, recording a stream assumes that you know what you are playing, e.g. mp4. If you use ffmpeg and the output file is .mp4 while stream is something else, then it will transcode the stream, which is probably not a good idea, since it is very processing intensive.

Therefore, getting it to work is NOT easy, since there are so many variables and unknowns that you have to investigate.
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