Control I-frame Size

[Umakant Goyal]

you are right.Can you please share how to force the encoder to use intra
macro block refresh in between not for first I-Frame?

On Sun, Dec 4, 2011 at 6:35 PM, Michael Joachimiak <mjoachimiak at gmail.com>wrote:

> AFAIK There is no way you can decrease bitrate for initial I-frame since
> there is no frames before that frame to serve for prediction.
> The only way at that point is to use higher QP or to use different
> encoding standard.
>
> cyclic intra macroblock refresh can help you to remove bitrate fluctuation
> on I-frames but still first frame has to be intra predicted (has to  be I).
>
>
>
> 2011/12/4 Umakant Goyal <umakantgoyal1 at gmail.com>
>
>> Thanks Michael, My Problem is that initial I-Frame size (bitrate) is very
>> high. I want to reduce the size of initial I-Frame.
>>
>> How can i force encoder to do cyclic intra macroblock refresh instead of
>> periodical intra-frame refresh?
>>
>> On Sun, Dec 4, 2011 at 2:42 PM, Michael Joachimiak <mjoachimiak at gmail.com
>> > wrote:
>>
>>> Bitrate fluctuation is normal in case of I-frame. I don't know if you
>>> can do much about it apart from using rate control.
>>> Do you use any rate control?
>>> Instead of having periodical intra-frame refresh you could have cyclic
>>> intra macroblock refresh. It means you do not refresh the whole frame at
>>> once but you have some macroblocks forced to be encoded as intra in every
>>> frame.
>>> Thus the whole frame is intra-refreshed after some period of time.
>>>
>>>
>>> 2011/12/3 Umakant Goyal <umakantgoyal1 at gmail.com>
>>>
>>>> Hi Ashwini, I think you misunderstood me. Here i am not talking about
>>>> picture size.I need to reduce the number of bits that is being produced by
>>>> encoder to generate I-Frame. Please suggest how to reduce the number of
>>>> bits for per I-Frame without loosing the quality much.
>>>>
>>>> Thanks
>>>>
>>>>
>>>> On Fri, Dec 2, 2011 at 4:43 PM, Ashwini Sharma <ak.ashwini at gmail.com>wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I think you can use videoscale to do the job.
>>>>>
>>>>> --Ashwini
>>>>>
>>>>> On Mon, Nov 28, 2011 at 10:58 PM, Umakant Goyal <
>>>>> umakantgoyal1 at gmail.com> wrote:
>>>>>
>>>>>> Hi, What all settings of ffenc_h263 will help me to control/reduce
>>>>>> the size of I-Frame?
>>>>>>
>>>>>> Thanks in Advance
>>>>>>
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>>>>>>
>>>>>
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>>>
>>>
>>> --
>>> Your Sincerely
>>> Michal Joachimiak
>>>
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>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
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>>
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>>
>
>
> --
> Your Sincerely
> Michal Joachimiak
>
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