 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Orchid XP v8 wrote:
> mencoder mf://*.png -ovc lavc -lavcopts vcodec=mpeg1video:vbitrate=5000
> -ofps 12 -vf scale=720:576 -of lavf -lavfopts format=mpg -o out.mpg
>
> (As a nice bonus, since it's compressed it doesn't take up my entire
> harddrive! The bitrate shown seems to produce pretty good results.)
>
> I'm curios... why is it so damned hard to do this??
Why do you think it's hard.
-ovc is needed to specify the codec. You'd need this for any general
purpose encoder.
-lavcopts specify the options for the lavc codec.
vcodec is to specify the format (they have mpeg2 if you want that instead).
vbitrate specifies the bitrate.
-ofps is the framerate - needed if you're not going to use the default.
-vf scale is because you wanted to scale.
-of is needed because it does avi by default. My mencoder has an mpeg
option - but you chose lavf...
Most of these things will be needed whatever software you use. I've
noticed converting to MPEG1 or 2 is always a pain - I just use the avi
format and a codec like xvid. The commandline is a bit short.
--
In an Astronomy class (toward an Astronomy major, not that gen-ed crap)
the professor did not tell us we would have to remember constants, and
he asked them as questions. They were short questions, and weren't worth
a lot.
One of them was: What is the orbital period of Saturn? (2 pts/100)
I started thinking about Bode's law and the posibility I could calculate
it from an approximate radius I would get from that law... if I could
remember it. But when you expect a 72% to be an A on a test, you have
bigger fish to fry.
Then I got it. It was right, it should work, and no one would have to be
nailed to anything.
I wrote: One Saturn-Year
I didn't get credit for it. A couple years later a sophomore was telling
me about this funny question he had in the same class. He showed it to
me. It read:
What is the orbital period of Saturn? (Do not put one Saturn-Year)
I was so right that it had to be guarded against. Yet those were 2
points I would never have.
(as told by SetupWeasel on Slashdot)
/\ /\ /\ /
/ \/ \ u e e n / \/ a w a z
>>>>>>mue### [at] nawaz org<<<<<<
anl
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Warp wrote:
> Nowadays you might want to use mpeg4 instead of mpeg1. The former can
> compress to less than one fourth the size of the latter, while retaining
> the same image quality (or even better).
Many DVD players can't handle it. However, if that's not his target,
I'll agree that mpeg1 is a bad idea. But then again, I get occasional
requests from friends to encode stuff from one format to another because
they want to send it to relatives, and they want to make sure it'll
work. The assumptions are that they won't have special software like
Quicktime Player or VLC, nor will they have any codecs that don't come
with Windows. The only real option is MPEG1 or 2.
--
In an Astronomy class (toward an Astronomy major, not that gen-ed crap)
the professor did not tell us we would have to remember constants, and
he asked them as questions. They were short questions, and weren't worth
a lot.
One of them was: What is the orbital period of Saturn? (2 pts/100)
I started thinking about Bode's law and the posibility I could calculate
it from an approximate radius I would get from that law... if I could
remember it. But when you expect a 72% to be an A on a test, you have
bigger fish to fry.
Then I got it. It was right, it should work, and no one would have to be
nailed to anything.
I wrote: One Saturn-Year
I didn't get credit for it. A couple years later a sophomore was telling
me about this funny question he had in the same class. He showed it to
me. It read:
What is the orbital period of Saturn? (Do not put one Saturn-Year)
I was so right that it had to be guarded against. Yet those were 2
points I would never have.
(as told by SetupWeasel on Slashdot)
/\ /\ /\ /
/ \/ \ u e e n / \/ a w a z
>>>>>>mue### [at] nawazorg<<<<<<
anl
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Orchid XP v8 wrote:
> Mencoder/MPlayer can do this - although it seems to be horribly
> difficult to get right. (E.g., I just discovered that the filename used
> for the output file can actually affect the transcoding process - WTF?)
I find this hard to believe - especially when you specify the format
and codec.
--
In an Astronomy class (toward an Astronomy major, not that gen-ed crap)
the professor did not tell us we would have to remember constants, and
he asked them as questions. They were short questions, and weren't worth
a lot.
One of them was: What is the orbital period of Saturn? (2 pts/100)
I started thinking about Bode's law and the posibility I could calculate
it from an approximate radius I would get from that law... if I could
remember it. But when you expect a 72% to be an A on a test, you have
bigger fish to fry.
Then I got it. It was right, it should work, and no one would have to be
nailed to anything.
I wrote: One Saturn-Year
I didn't get credit for it. A couple years later a sophomore was telling
me about this funny question he had in the same class. He showed it to
me. It read:
What is the orbital period of Saturn? (Do not put one Saturn-Year)
I was so right that it had to be guarded against. Yet those were 2
points I would never have.
(as told by SetupWeasel on Slashdot)
/\ /\ /\ /
/ \/ \ u e e n / \/ a w a z
>>>>>>mue### [at] nawazorg<<<<<<
anl
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Orchid XP v8 wrote:
> [Although actually... Mencoder is doing something strange at me. No
> matter how high I turn up the bitrate, the colours look a tad blocky for
> no apparent reason...]
MPEG1 sucks.
--
In an Astronomy class (toward an Astronomy major, not that gen-ed crap)
the professor did not tell us we would have to remember constants, and
he asked them as questions. They were short questions, and weren't worth
a lot.
One of them was: What is the orbital period of Saturn? (2 pts/100)
I started thinking about Bode's law and the posibility I could calculate
it from an approximate radius I would get from that law... if I could
remember it. But when you expect a 72% to be an A on a test, you have
bigger fish to fry.
Then I got it. It was right, it should work, and no one would have to be
nailed to anything.
I wrote: One Saturn-Year
I didn't get credit for it. A couple years later a sophomore was telling
me about this funny question he had in the same class. He showed it to
me. It read:
What is the orbital period of Saturn? (Do not put one Saturn-Year)
I was so right that it had to be guarded against. Yet those were 2
points I would never have.
(as told by SetupWeasel on Slashdot)
/\ /\ /\ /
/ \/ \ u e e n / \/ a w a z
>>>>>>mue### [at] nawazorg<<<<<<
anl
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Mueen Nawaz wrote:
>
> Many DVD players can't handle it. However, if that's not his target,
> I'll agree that mpeg1 is a bad idea. But then again, I get occasional
> requests from friends to encode stuff from one format to another because
> they want to send it to relatives, and they want to make sure it'll
> work. The assumptions are that they won't have special software like
> Quicktime Player or VLC, nor will they have any codecs that don't come
> with Windows. The only real option is MPEG1 or 2.
>
On that target (have-to-play for relatives etc) I'd shoot for MPEG-2 and
a "real" playable DVD-Video -disc (as I guess Andrew will finally be
doing). It would seem the easiest and nicest way to watch such a video.
--
Eero "Aero" Ahonen
http://www.zbxt.net
aer### [at] removethiszbxtnetinvalid
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On Sun, 15 Jun 2008 21:52:54 +0100, Orchid XP v8 wrote:
> It always surprises me when a big well-known "jewl" of the open source
> scene has really poor documentation. You'd think something that popular
> would be well-documented...
This isn't unique to the open-source world. I've seen plenty of
commercially-available offerings over the years that the documentation
was nonexistent.
Jim
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Eero Ahonen wrote:
> On that target (have-to-play for relatives etc) I'd shoot for MPEG-2 and
> a "real" playable DVD-Video -disc (as I guess Andrew will finally be
> doing). It would seem the easiest and nicest way to watch such a video.
This is my ultimate target, yes.
Weirdly, my PC will play DVDs, but if I tell Mencoder to produce an
MPEG-2 file instead of MPEG-1, the result isn't playable.
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
>> I'm curios... why is it so damned hard to do this??
>
> Why do you think it's hard.
Why can't I just say -ovc mpeg1? Why do I have to say -ovc lacv
-lavcopts vcodec=mpeg1video? That seems unecessarily complex.
Also, why is there *nowhere* in the manual that says "to produce a
standard MPEG-1 file, type XYZ"? Do you have any idea how freakin long
it took me to decode the manual to the point where I could construct
this commandline?
[E.g., nowhere is it actually documented that if you want to pass
*multiple* options to lavc, you have to seperate them with colons.
Eventually I noticed it in an example - an example demonstrating
something completely unrelated to syntax - and copied it. In general,
trying to figure out how the hell to make Mencoder do anything reduces
to endless trail and cryptic error...]
> Most of these things will be needed whatever software you use. I've
> noticed converting to MPEG1 or 2 is always a pain - I just use the avi
> format and a codec like xvid. The commandline is a bit short.
As far as I can tell, making Mencoder output any format is equally
difficult and error-prone. [I still can't get it to produce an
uncompressed AVI file that anything except MPlayer can comprehend.]
Adding a rare codec like XviD would just make matters worse...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
>> [Although actually... Mencoder is doing something strange at me. No
>> matter how high I turn up the bitrate, the colours look a tad blocky
>> for no apparent reason...]
>
> MPEG1 sucks.
Define "sucks".
MPEG1 works just fine, and I've used it plenty of times before. However,
Mencoder is doing something weird with it. One could argue that Mencoder
sucks, not MPEG1. :-P
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Invisible wrote:
>>
>> MPEG1 sucks.
>
> Define "sucks".
The picture quality of MPEG1 is something horrible.
--
Eero "Aero" Ahonen
http://www.zbxt.net
aer### [at] removethiszbxtnetinvalid
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
