Difference between revisions of "Mencoder"
From Tomelec
m |
(→Scaling and MPEG4 encoding) |
||
| Line 12: | Line 12: | ||
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 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. | + | '''-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: |
| + | <nowiki> 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.</nowiki> | ||
Revision as of 11:05, 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 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.
