[MPlayer-users] crop, scale, expand, audio resample (basicley making DVD PAL combatible)
maillist at gozar.dynu.com
Sun Mar 6 19:16:46 CET 2005
I'll start off, by saying that I'm a noob, and know almost nothing about
encoding, I'm useing the cvs version of mplayer.
I have an none dvd compatible mpeg file, who I want to make to dvd pal
compatible. I want 25 Framerate and resolution of 704x480. I will write,
the steps I have gone through, and would like some input, if I did it
right, or if not, why.
The full joind command is near the buttom.
The file has the following specs (using -identify)
There are borders on both width, and hight. so using mplayer -vf
crop=x:x:x:x I came up with the following crop ( cropdetect did'ent work
for me) crop=440:280:25:-1
In order to get the width to 704 and keep the aspect I took 440 and
divided it with 704. That gives me the numper 1,6. So I multiplyed the
hight with 1,6 to keep aspect. That gives me a hight of 448. that gives
me the scale=704:448
The hight need to be 480 so I need to add a black border, with
The hole video processing:
The audio rate is also wrong. I need a audio rate of 48000, so I need
the audo resample filer -af resample 48000. The man page also tells me
that I need the -srate so the audio prosessing looks like these:
-af resample=48000 -srate 48000
The framerate is ntfs, that I'll solve with:
Now In order for any of the abow to actully have any meaning I need to
reencode both video and audio.
I came up with the following for video:
-ovc lavc -lavcopts vcodec=mpeg2video:aspect=16/9:keyint=25
vcodec=mpeg2video, becaues it's mpeg2 video in dvd.
aspect=16/9 well, because that's what looked best while testing :-)
keyint=25, because I want a seekable dvd, and keyint have somthing to do
with that :-)
-oac lavc -lavcopts acodec=mp2:bitrate=128
acodec=mp2, I just want to be sure it's mp2 (mp2 is default lavc audio
bitrate=128, because the bitrate is 128 to start with. no need to waste
space with a higher bitrate
I also need:
of mpeg -mpegopts format=dvd, again because I want to produce a dvd, and
this have somthing to do with muxing i think!
The hole command joined togeather looks like this:
mencoder -vf crop=440:288:25,-1,scale=704:448,expand=704:480 -af
resample=48000 -srate 48000 -of mpeg -mpegopts format=dvd -ofps 25 -ovc
lavc -oac lavc -lavcopts
Now, does that get me a valid dvd pal compatible mpeg file, ready to be
used with dvdauthor software?
also note I have also tryed with -mc 0 -noskip, but then the audio/video
was out of sync!
Thanks for reading.
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