[vlc-devel] RE : VLC as a frame-server : some problems remains.

[Video Guru]

TThanks Erwan10,  for your valuable suggestion.

I was looking at the  \modules\codec\avcodec\encoder.c and the dummy
one : modules\misc\dummy\encoder.c but could not gather much.

My questions are :

1. How do I pass the config parameters like the format & size of the
video frame to it, and how to force the back-end modules to give frame
in this format/size. Also how can I callback to my application (like
vmem) from the encoder thread.

2. Same goes for audio, but I think if I can get it done for video, it
could be done with the audio also.

And here are my assumptions, correct me if I am wrong.

1. I am planning to pass the date information from video and audio to
my application where it will do the sync, so the date information in
video and audio will help me do the sync.

2. All the video frames and audio buffers which I get in my_encoder.c
will be in proper sequence, like frame 1,2,3,4.........


Please guide.




On Thu, Feb 19, 2009 at 6:53 PM, brezhoneg1 <brezhoneg1 at yahoo.fr> wrote:
> Just as a thought,
>
> Why not modify vmem to make it a fake video encoder instead of a vout
> plugin and use it in a sout chain.
> From what I recall, when just transcoding in vlc (no display at all),
> the speed limit is removed .....
>
> Erwan10
>
>> -----Message d'origine-----
>> De : vlc-devel-bounces at videolan.org [mailto:vlc-devel-
>> bounces at videolan.org] De la part de Video Guru
>> Envoyé : jeudi 19 février 2009 13:04
>> À : Mailing list for VLC media player developers
>> Objet : Re: [vlc-devel] VLC as a frame-server : some problems remains.
>>
>> Thanks Remi for the reply.
>>
>> On vmem's lock callback, I immediately give a pointer from my
>> applications managed buffers, and returns. After vmem's unlock I mark
>> that buffer as filled for the display use. I have 100 such buffers.
>> But vmem lock callback is arriving at the media's fps, i.e., 25 Hz.
>>
>> So the callback rate is being limited by the VLC, may be for the A/V
>> sync etc. But I am managing my own A/V sync based on the dates so I
>> want the max speed which disk io/codec/vlc can reach.
>>
>> Please guide.
>>
>>
>> On Thu, Feb 19, 2009 at 5:17 PM, Rémi Denis-Courmont
>> <rdenis at simphalempin.com> wrote:
>> >
>> > On Thu, 19 Feb 2009 17:06:21 +0530, Video Guru
> <guru.video at gmail.com>
>> > wrote:
>> >> libvlc is limiting the delivery rate to vmem based on the fps of
> the
>> >> media. I dont want that. I want to get frames as fast as possible
> to
>> >> fill my buffer, when my buffer is near full, I will either pause
> vlc,
>> >> or hold the vmem lock (with of course, --no-drop-frames).
>> >
>> > I suspect that the vmem plugin supports only one frame buffer, and
> that
>> > would be the issue. VLC has to wait until there is one buffer
> available.
>> >
>> > --
>> > Rémi Denis-Courmont
>> >
>> > _______________________________________________
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>> >
>>
>>
>>
>> --
>> ---------------------------------------------------------------------
>>
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>> drinking.
>>
>>   - Dave Barry
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-- 
---------------------------------------------------------------------

Electricity is actually made up of extremely tiny particles called
electrons, that you cannot see with the naked eye unless you have been
drinking.

  - Dave Barry