Difference between revisions of "Mencoder"
From Tomelec
m (→DV to MPEG4 with deinterlacing) |
m (→Scaling and MPEG4 encoding) |
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== Scaling and MPEG4 encoding == | == Scaling and MPEG4 encoding == | ||
Scale a high resolution video down to a lower resolution, preserving the aspect ratio. MPEG4 encoding options as usual. | Scale a high resolution video down to a lower resolution, preserving the aspect ratio. MPEG4 encoding options as usual. | ||
| − | This scales any video that ''mencoder'' is able to read to a 480p video (480 pixels high). | + | This scales any video that ''mencoder'' is able to read to a [http://en.wikipedia.org/wiki/480p 480p] video (480 pixels high). |
<nowiki>mencoder input.mov -vf scale=-3:480 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=3000 -oac mp3lame -lameopts vbr=3 -o output.avi</nowiki> | <nowiki>mencoder input.mov -vf scale=-3:480 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=3000 -oac mp3lame -lameopts vbr=3 -o output.avi</nowiki> | ||
'''-vf scale=-3:''' calculates the with of the video using the original aspect ratio and the desired height.<br>Other scaling options as noted in ''mplayer´s'' manpage: | '''-vf scale=-3:''' calculates the with of the video using the original aspect ratio and the desired height.<br>Other scaling options as noted in ''mplayer´s'' manpage: | ||
Revision as of 10:09, 14 May 2012
Hint: all video filters (-vf option) can be previewed using mplayer before starting the actual encoding procedure.
DV to MPEG4 with deinterlacing
Encode a raw DV file from a digital video camera to MPEG4 video with mp3 audio.
mencoder input.dv -vf pp=lb -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=2000 -oac mp3lame -lameopts vbr=3 -o output.avi
Adjust vbitrate to your needs. vbitrate=2000 produces a quite good quality at a small filesize for videos in TV standard resolution.
Scaling and MPEG4 encoding
Scale a high resolution video down to a lower resolution, preserving the aspect ratio. MPEG4 encoding options as usual. This scales any video that mencoder is able to read to a 480p video (480 pixels high).
mencoder input.mov -vf scale=-3:480 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=3000 -oac mp3lame -lameopts vbr=3 -o output.avi
-vf scale=-3: calculates the with of the video using the original aspect ratio and the desired height.
Other scaling options as noted in mplayer´s manpage:
0: scaled d_width/d_height -1: original width/height -2: Calculate w/h using the other dimension and the prescaled aspect ratio. -3: Calculate w/h using the other dimension and the original aspect ratio. -(n+8): Like -n above, but rounding the dimension to the closest multiple of 16.
