[Libav-user] avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet) why most of the time frameFinished is zero ?

[sithruk sana]

thanks for the reply.

I am doing the same by queueing the packet  as described in dranger
tutorial http://dranger.com/ffmpeg/ffmpegtutorial_all.html


The behaviour is somewhat different if i do not queue the packet. Are there
any quirk i need to be aware of while pusing/pulling from queue ?

Kindly help me.




On Tue, May 27, 2014 at 4:12 PM, cyril poulet
<cyril.poulet at centraliens.net>wrote:

> a packet rarely contains an entire frame. You have to feed the decoder
> packets until a frame is finished.
> frameFinished is the flag that tells you that a complete frame has been
> gathered and decoded, and that you can now work on it
>
> However, seeing the number of messages you left recently, you might want
> to find a tutorial instead of posting very simple questions...
>
>
> 2014-05-27 12:34 GMT+02:00 cyril poulet <xenosender at gmail.com>:
>
> a packet rarely contains an entire frame. You have to feed the decoder
>> packets until a frame is finished.
>> frameFinished is the flag that tells you that a complete frame has been
>> gathered and decoded, and that you can now work on it
>>
>>
>> 2014-05-26 10:36 GMT+02:00 sithruk sana <get2jils at gmail.com>:
>>
>>> Dear all,
>>>
>>> I received a packet from rtsp by av_read_frame and decode it through
>>>
>>>  avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet)
>>>
>>> After decoding i am checking  the value of frameFinished.
>>>
>>> Most of the time i get the value of frameFinished is zero.  May be around
>>> 50% of the packet.
>>>
>>>
>>> Can u hint me what could be the reason ?
>>>
>>> It is any way related to 'I', 'P', 'B' packet types ?
>>>
>>>
>>>
>>>
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>>> Libav-user at ffmpeg.org
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>>>
>>>
>>
>
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