increase encoding spped using video graphics card

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increase encoding spped using video graphics card

Pierpaolo Gullˆa
I guys ,

I have  strange question:
It's possible using some partuclar version or setting of ffmpeg to use
the high power of the new graphics card to increase the encoder speed?
I have read something about this , but nothing of sure!!

Thanks a alot

Br


Pierpaolo
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New mailing list for programmers/developers using libav*?

Kyle Mallory-2
Can I make a request to the List Gods, to create a new mailing list
specifically for C programmers who are using the libav* libraries?

It seems as a coder, who rarely uses the command-line tools, my requests
seem to be often overlooked, as well as having to hunt through
(literally) hundreds, if not thousands of messages before finding one
that is relevant to me as a developer.

If such a mailing list already exists, or better yet, a web-based forum,
that would just be cool.


Thanks,

KM
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Re: New mailing list for programmers/developers using libav*?

vaijanath rao
Hi KM,

----- Original Message ----
From: Kyle Mallory <[hidden email]>
To: FFmpeg user questions and RTFMs <[hidden email]>
Sent: Thursday, 27 December, 2007 9:11:56 PM
Subject: [Ffmpeg-user] New mailing list for programmers/developers using libav*?

Can I make a request to the List Gods, to create a new mailing list
specifically for C programmers who are using the libav* libraries?

It seems as a coder, who rarely uses the command-line tools, my
 requests
seem to be often overlooked, as well as having to hunt through
(literally) hundreds, if not thousands of messages before finding one
that is relevant to me as a developer.

If such a mailing list already exists, or better yet, a web-based
 forum,
that would just be cool.



Thanks,

KM


Looks like i need one too, the archive is too big to search through the entire stuff,


--Thanks and Regards
Vaijanath
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Re: New mailing list for programmers/developers usinglibav*?

Mikael Hakman
In reply to this post by Kyle Mallory-2
Hello Kyle,

On Thursday, December 27, 2007 4:41 PM Kyle Mallory wrote:

> Can I make a request to the List Gods, to create a new mailing list
> specifically for C programmers who are using the libav* libraries?
>
> It seems as a coder, who rarely uses the command-line tools, my requests
> seem to be often overlooked, as well as having to hunt through
> (literally) hundreds, if not thousands of messages before finding one
> that is relevant to me as a developer.
>
> If such a mailing list already exists, or better yet, a web-based forum,
> that would just be cool.

I agree 100% percent. We need a list for users of libav* libraries where we
could discuss programming topics and libav* usage patterns. Currently,
ffmpeg-user list is mostly about using ffmpeg, which is entirely different
topic from developing programs that use libav* libraries. On the other hand,
ffmpeg-developer list concerns itself with developing ffmpeg and developing
libav* libraries themselves.

For example, few weeks ago I asked a question concerning what flags need to
be set in program code in order to activate 2-pass mpeg encoding because the
obvious setting of PASS1/PASS2 flags didn't have the desired effect. I did
not receive any answers on ffmpeg-users list, and ffmpeg-developer list
members didn't think that their list is an appropriate one for this type of
questions. Nevertheless, there is no doubt in my mind that there exist
people who know the answer because this is what ffmpeg does, if this feature
is still active that is.

The point of lists and exchanging information is reusing knowledge already
gained by others so that you don't have to debug and dig deeply into code
every time you need some information. Such a list could even be a basis for
(not yet existent) libav* libraries programmers manual/guide.

Thanks/Mikael

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Re: New mailing list for programmers/developers usinglibav*?

Stefan de Konink
+1
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Re: New mailing list for programmers/developers usinglibav*?

Stefano Sabatini
In reply to this post by Mikael Hakman
On date Thursday 2007-12-27 20:06:39 +0100, Mikael Hakman encoded:

> Hello Kyle,
>
> On Thursday, December 27, 2007 4:41 PM Kyle Mallory wrote:
>
> > Can I make a request to the List Gods, to create a new mailing list
> > specifically for C programmers who are using the libav* libraries?
> >
> > It seems as a coder, who rarely uses the command-line tools, my requests
> > seem to be often overlooked, as well as having to hunt through
> > (literally) hundreds, if not thousands of messages before finding one
> > that is relevant to me as a developer.
> >
> > If such a mailing list already exists, or better yet, a web-based forum,
> > that would just be cool.
>
> I agree 100% percent. We need a list for users of libav* libraries where we
> could discuss programming topics and libav* usage patterns. Currently,
> ffmpeg-user list is mostly about using ffmpeg, which is entirely different
> topic from developing programs that use libav* libraries. On the other hand,
> ffmpeg-developer list concerns itself with developing ffmpeg and developing
> libav* libraries themselves.
>
> For example, few weeks ago I asked a question concerning what flags need to
> be set in program code in order to activate 2-pass mpeg encoding because the
> obvious setting of PASS1/PASS2 flags didn't have the desired effect. I did
> not receive any answers on ffmpeg-users list, and ffmpeg-developer list
> members didn't think that their list is an appropriate one for this type of
> questions. Nevertheless, there is no doubt in my mind that there exist
> people who know the answer because this is what ffmpeg does, if this feature
> is still active that is.
>
> The point of lists and exchanging information is reusing knowledge already
> gained by others so that you don't have to debug and dig deeply into code
> every time you need some information. Such a list could even be a basis for
> (not yet existent) libav* libraries programmers manual/guide.

This has been already discussed on this list:
http://thread.gmane.org/8ac6caaf0707100300k4ecf0178x68d4f0db4e0076d5@...

Michael Niedermayer, the current lists maintainer, seems against it.

I still think that such a split could ease the search for
programming-related issues. On the other end the *use* of the ffmpeg
tools require in many cases a good programming background and often the
reading and understanding of the code, so there would be a certain
degree of overlap between the two lists discussions.

Regards.
--
ffmpeg-user random tip #11
One minute of pure video silence with ffmpeg:
ffmpeg -t 60 -s qcif -f rawvideo -pix_fmt rgb24 -r 25 -i /dev/zero \
    -y silence.mpeg
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Re: New mailing list for programmers/developers usinglibav*?

Kyle Mallory-2

On Fri, 2007-12-28 at 11:52 +0100, Stefano Sabatini wrote:

> On date Thursday 2007-12-27 20:06:39 +0100, Mikael Hakman encoded:
> > Hello Kyle,
> >
> > On Thursday, December 27, 2007 4:41 PM Kyle Mallory wrote:
> >
> > > Can I make a request to the List Gods, to create a new mailing list
> > > specifically for C programmers who are using the libav* libraries?
> > >
> > > It seems as a coder, who rarely uses the command-line tools, my requests
> > > seem to be often overlooked, as well as having to hunt through
> > > (literally) hundreds, if not thousands of messages before finding one
> > > that is relevant to me as a developer.
> > >
> > > If such a mailing list already exists, or better yet, a web-based forum,
> > > that would just be cool.
> >
> > I agree 100% percent. We need a list for users of libav* libraries where we
> > could discuss programming topics and libav* usage patterns. Currently,
> > ffmpeg-user list is mostly about using ffmpeg, which is entirely different
> > topic from developing programs that use libav* libraries. On the other hand,
> > ffmpeg-developer list concerns itself with developing ffmpeg and developing
> > libav* libraries themselves.
> >
> > For example, few weeks ago I asked a question concerning what flags need to
> > be set in program code in order to activate 2-pass mpeg encoding because the
> > obvious setting of PASS1/PASS2 flags didn't have the desired effect. I did
> > not receive any answers on ffmpeg-users list, and ffmpeg-developer list
> > members didn't think that their list is an appropriate one for this type of
> > questions. Nevertheless, there is no doubt in my mind that there exist
> > people who know the answer because this is what ffmpeg does, if this feature
> > is still active that is.
> >
> > The point of lists and exchanging information is reusing knowledge already
> > gained by others so that you don't have to debug and dig deeply into code
> > every time you need some information. Such a list could even be a basis for
> > (not yet existent) libav* libraries programmers manual/guide.
>
> This has been already discussed on this list:
> http://thread.gmane.org/8ac6caaf0707100300k4ecf0178x68d4f0db4e0076d5@...
>
> Michael Niedermayer, the current lists maintainer, seems against it.
>
> I still think that such a split could ease the search for
> programming-related issues. On the other end the *use* of the ffmpeg
> tools require in many cases a good programming background and often the
> reading and understanding of the code, so there would be a certain
> degree of overlap between the two lists discussions.

Way back when, around the 5th of August, 2007, Michael Niedermayer said:

> first i dont have any strong oppinion on this but what is it supposed to
> achive?
> i doubt more questions will be awnsered if the list is split, the developers
> simply have too little time ...

The goal is to provide a home for users of the libav* libraries, which
are neither developers of ffmpeg, nor users of ffmpeg CLI.

While I would hope that the ffmpeg developers would participate in such
a list, the issue is as much about allowing other libav* users to
communicate freely in order to resolve their own issues, without having
to do so by polluting an already popular list with code segments and
deeply technical questions that have little impact or relevance to
ffmpeg CLI users (which ultimately get lost in the tidalwave of regular
emails).

At its core, the very nature of a mailing list is to ease communication
and discussion of threads which have a common topic-- in this case, how
to best use the libav* libraries.

> simply reading the source and trying to help others who have questions
> is likely your best chance to improve the situation ...

This is what would be achieved by such a list, but without the need to
wade through countless (and unfortunately, often meaningless) emails
which have nothing to with the topic at hand (ie, why does
avcodec_flush_buffer() segfault?, or how to properly calculate stream
pts from the format pts, and vice-versa?, etc.)

> Regards.

It seems Michael isn't opposed to it, simply that it didn't get pushed
after his reply to the old thread.  Perhaps with enough of us asking for
the same thing, we can provide a solid argument for the change.

Michael?


KM

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Re: New mailing list forprogrammers/developers usinglibav*?

Mikael Hakman
In reply to this post by Stefano Sabatini
On Friday, December 28, 2007 11:52 AM, Stefano Sabatini wrote:

> On date Thursday 2007-12-27 20:06:39 +0100, Mikael Hakman encoded:
>> Hello Kyle,
>>
>> On Thursday, December 27, 2007 4:41 PM Kyle Mallory wrote:
>>
>> > Can I make a request to the List Gods, to create a new mailing list
>> > specifically for C programmers who are using the libav* libraries?
>> >
>> > It seems as a coder, who rarely uses the command-line tools, my
>> > requests
>> > seem to be often overlooked, as well as having to hunt through
>> > (literally) hundreds, if not thousands of messages before finding one
>> > that is relevant to me as a developer.
>> >
>> > If such a mailing list already exists, or better yet, a web-based
>> > forum,
>> > that would just be cool.
>>
>> I agree 100% percent. We need a list for users of libav* libraries where
>> we
>> could discuss programming topics and libav* usage patterns. Currently,
>> ffmpeg-user list is mostly about using ffmpeg, which is entirely
>> different
>> topic from developing programs that use libav* libraries. On the other
>> hand,
>> ffmpeg-developer list concerns itself with developing ffmpeg and
>> developing
>> libav* libraries themselves.
>>
>> For example, few weeks ago I asked a question concerning what flags need
>> to
>> be set in program code in order to activate 2-pass mpeg encoding because
>> the
>> obvious setting of PASS1/PASS2 flags didn't have the desired effect. I
>> did
>> not receive any answers on ffmpeg-users list, and ffmpeg-developer list
>> members didn't think that their list is an appropriate one for this type
>> of
>> questions. Nevertheless, there is no doubt in my mind that there exist
>> people who know the answer because this is what ffmpeg does, if this
>> feature
>> is still active that is.
>>
>> The point of lists and exchanging information is reusing knowledge
>> already
>> gained by others so that you don't have to debug and dig deeply into code
>> every time you need some information. Such a list could even be a basis
>> for
>> (not yet existent) libav* libraries programmers manual/guide.
>
> This has been already discussed on this list:
> http://thread.gmane.org/8ac6caaf0707100300k4ecf0178x68d4f0db4e0076d5@...
>
> Michael Niedermayer, the current lists maintainer, seems against it.
>
> I still think that such a split could ease the search for
> programming-related issues. On the other end the *use* of the ffmpeg
> tools require in many cases a good programming background and often the
> reading and understanding of the code, so there would be a certain
> degree of overlap between the two lists discussions.

If people with knowledge on libav* internals and usage aren't interested in
passing this knowledge on to other people so that the number of projects
using libav* increase then no list in the world can do anything about it. If
nobody is interested in documenting libav* from its application programmer
perspective, not even in passing that information to others, then of course
no documentation will be done.

Otherwise, my experience from more than 2 decades both as a user, tester,
and to some degree developer of software in the Open Source movement,
indicate the opposite. Normally you get all the help they can give you.
Then, you in your turn give all help you can to others - this is how it
grows! Why would libav* be different in this respect?

Thanks/Mikael

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