Control I-frame Size

[Michael Joachimiak]

it depends on your encoder.
Please check in the options.

2011/12/4 Umakant Goyal <umakantgoyal1 at gmail.com>

> 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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>>>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>>>>
>>>>>>>
>>>>>>
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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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>>
>
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>


-- 
Your Sincerely
Michal Joachimiak
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