How to force video encoder to generate first frame as I-frame

[Umakant Goyal]

Any further suggestion??

On Sun, Jul 10, 2011 at 11:35 AM, vineeth <nvineeth at gmail.com> wrote:

>
> On Sun, Jul 10, 2011 at 12:44 AM, Umakant Goyal <umakantgoyal1 at gmail.com>wrote:
>
>> Hi All,
>>
>> I have written a application where i am receiving the data from network
>> (over RTP), transcoding it and dumping the data into file. Application is
>> working fine as such means i am not able to receive the data, transcode it
>> and dump it into the file. But It has one serious issue. Issue is that most
>> of the time first video frame is not coming as I-Frame. There are chances
>> that my application is getting P-Frame as first video frame  (because there
>> is possibility that peer end has started sending data before i got ready to
>> receive it. I also can not force peer end to start sending data whenever my
>> app is ready to receive). So in that case file that is being recorded by my
>> application contains green screen at the start. This gives bad impression.
>>
>> Can some one share how i can i force the transcoder to generate first
>> Frame as I-Frame even if it is getting P-Frame as first frame?
>>
>
> I dont think its possible to generate a I Frame from a P/B frame, since the
> P/B frame is not independently decodable; Best option would be to wait till
> you get the IFrame and then start transcoding from that point. If its H.264,
> you will also need access to SPS / PPS data to initialize the decode-encode
> chain of transcoders.
>
>
>>
>> Thanks in Advance
>>
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>>
>>
>
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