Aasimon.org Wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
=====MPlayer Usage (and some other video stuff)=====
====MPlayer====
===Play video stream from webcam through v4l2===
Make sure that mplayer is compiled with the v4l2 use flag.
Make sure that the kerenl is compiled with video for linux support (Device Drivers ---> Multimedia support  ---> <*> Video For Linux) and with proper device driver support (in the subsections of aforementioned config section).
<code>
mplayer -fps 15 tv:// -tv driver=v4l2:device=/dev/video0
</code>

===Play MTS files===
<code>
mplayer -demuxer lavf -lavdopts threads=4:fast:skiploopfilter=all:skipframe=none -fps 25 SOMEFILE.MTS
</code>

====MEncoder====
===Encoding an xvid file in 2 pass mode===
The following example will encode a file in xvid 2 pass mode with normalized mp3 audio.
<code>
mencoder -o /dev/null -ovc xvid -xvidencopts pass=1 -nosound $FILENAME
mencoder -o $OUTPUT -ovc xvid -xvidencopts bitrate=$BITRATE:pass=2 \
    -oac mp3lame -lameopts vbr=3:br=112:mode=1 -af volnorm $FILENAME
</code>

===Encoding an h264 file===
The following example will encode a file in h264 with normalized mp3 audio.
<code>
mencoder -o $OUTPUT -ovc x264 -x264encopts bitrate=$BITRATE:threads=3 \
    -oac mp3lame -lameopts vbr=3:br=112:mode=1 -af volnorm $FILENAME
</code>

===Making a flash movie===
Note it only works for 44100Hz sound, hence the ''-srate 44100'' option.
<code>
mencoder -ovc lavc -oac mp3lame -srate 44100 -lavcopts vcodec=flv \
         -of lavf -lavfopts format=swf $FILENAME -o $OUTPUT
</code>

===Making a DVD===
http://tovid.wikia.com/wiki/Making_a_basic_DVD\\
<del>A nice resource on the subject: http://gentoo-wiki.com/HOWTO_Create_a_DVD</del>\\
Another resource http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-vcd-dvd.html

===Grabbing from X11===
Low resolution and low quality:
<code>
ffmpeg -f x11grab -s vga -i :0.0 /tmp/out.mpg
</code>

Better quality and higher resolution:
<code>
ffmpeg -r 24 -f x11grab -s 1024x768 -i :0.0 -threads 0 -vcodec libx264 -vpre lossless_ultrafast /tmp/out.mkv
</code>

===Fixing a noisy VHS rip===
<code>
-vf-add hqdn3d=10:10:20 -vf-add pp=fd
</code>

''hqdn3d'' is a denoise filter, ''pp=fd'' is a deinterlace filter.

===Fixing annoying audio denormalisation===
<code>
-af volnorm=1,ladspa=/usr/lib/ladspa/fast_lookahead_limiter_1913.so:fastLookaheadLimiter:6:-0.1:0.01:20:0:0:0
</code>

Make sure that the swh-plugins ladspa package is installed on the system, and that mplayer is compiled with ladspa support.

===Create Ogg/Theora file for the new html video tag===
<code>
ffmpeg2theora movie.avi
mv movie.ogv movie.ogg
</code>
This is not exactly the mencoder approach... but this seemed to be the right place to put it.

===Browser friendly videos===
<code>
ffmpeg -i my-original-video.wmv -vcodec libx264 -f mp4 -vb 1024k -preset slow my-new-video.mp4
</code>

Extended (pixel format conversion):
<code>
ffmpeg -i my-original-video.wmv -pix_fmt yuv420p -vcodec libx264 -f mp4 -vb 1024k -preset slow my-new-video.mp4
</code>

Extended (pixel format conversion and audio from 'other.mp4'):
<code>
ffmpeg -i my-original-video.wmv -i other.mp4 -map 0:0 -map 1:1 -pix_fmt yuv420p -vcodec libx264 -f mp4 -vb 1024k -preset slow my-new-video.mp4
</code>

===Fixed bitrate videos for Blender===
<code>
ffmpeg -i input.mp4 -vcodec libx264 -f mp4 -b 1200k -minrate 1200k -maxrate 1200k -preset slow output-fixed.mp4
</code>

https://wiki.gentoo.org/wiki/FFmpeg