[FFmpeg-user] Big file webcam

[Felipe López Placencio]

Dear Roger, 


Thanks for your answer. I appreciate it.



I have tried to achieve 25 fps to 640x480, 800x600 or 1280x720 pixels.


I tried with a lot of commands, for example:


- ffmpeg -y -r 30000/1001 -f video4linux2 -s 640x480 -i /dev/video0 -b 2M -bt 4M -vcodec libx264 -vpre hq -t 10 output.mp4      

- ffmpeg -y -r 30000/1001 -f video4linux2 -s 640x480 -i /dev/video0 -vcodec libx264 -vpre hq -crf 26 -threads 0 -t 10 output2.mp4 

- ffmpeg -y -r 30000/1001 -f video4linux2 -s 640x480 -i /dev/video0 -r 30000/1001 -b 2M -bt 4M -vcodec libx264 -pass 1 -vpre fastfirstpass -an -t 10 output3.mp4

  ffmpeg -y -i output3.mp4 -r 30000/1001 -b 2M -bt 4M -vcodec libx264 -pass 2 -vpre hq -acodec libfaac -ac 2 -ar 48000 -ab 192k output4.mp4

- ffmpeg -y -r 30000/1001 -f video4linux2 -s 640x480 -i /dev/video0 -b 4M -bt 4M -vcodec libx264 -pass 1 -vpre fastfirstpass -an -t 10 output3.mp4

  ffmpeg -y -i output3.mp4 -r 30000/1001 -b 4M -bt 4M -vcodec libx264 -pass 2 -vpre hq output4.mp4

- ffmpeg -y -r 30000/1001 -f video4linux2 -s 640x480 -i /dev/video0 -b 8M -bt 8M -vcodec libx264 -pass 1 -vpre fastfirstpass -an -t 10 2-1.mp4
  ffmpeg -y -i 2-1.mp4 -r 30000/1001 -b 4M -bt 4M -vcodec libx264 -pass 2 -vpre hq 2-2.mp4


- ffmpeg -y -r 30000/1001 -f video4linux2 -s 640x480 -i /dev/video0 -acodec libfaac -ab 96k -b 8M -bt 8M -vcodec libx264 -vpre slow -crf 22 -threads 0 -t 10 bueno.mp4


With sound:
- ffmpeg -y -f alsa -i hw:1,0 -f video4linux2 -s 720x480 -r 25 -i /dev/video0 -acodec libmp3lame -ab 64k -b 2M -bt 2M -vcodec libx264 -vpre slow -crf 22 -threads 0 -async 1 out.avi   
- ffmpeg -y -f alsa -i hw:1,0 -f video4linux2 -s 720x480 -r 25 -i /dev/video0 -acodec libmp3lame -ab 64k -b 2M -bt 2M -vcodec libx264 -vpre fastfirstpass -crf 18 -threads 0 out.avi 


Obviously I'm trying changing the bitrate, -bt, -crf, resolution (-s), and so on.


The last 2 commands works fine, but the image has distortions. Looks a bit stuck (I don't know if it the correct word, sorry haha) 


If you need more information, don't hesitate in ask me.


Best regards from Chile
                          Felipe López P.


> From: rogerdpack2 at gmail.com
> Date: Wed, 18 Jul 2012 18:29:02 -0600
> To: ffmpeg-user at ffmpeg.org
> Subject: Re: [FFmpeg-user] Big file webcam
> 
> > I'm trying to capture video from my Microsoft Lifecam Studio. I tried with a
> > lot of commands and I achieved a good quality some times, but the problem is
> > that the good quality give it me a very big file. The idea is get the video
> > in 640x480 pixels or more, to 6 [MB/min] or less if it is possible.
> >
> > Now, the videos with good quality that I got, are bigger than 20 MB/min.
> 
> What's your current command line and full uncut console output? How
> many fps are you trying to achieve? (for me mp4 has worked pretty well
> in the past...libx264 might also help)
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