[Libav-user] rewind file

Slash slashpm at gmail.com
Sat Jun 21 12:25:20 CEST 2014

It sounds interesting, that is exactly what I want. Could you
elaborate a bit more on the steps how to create this queue? Do I only
need to save the packet pointers?

On 20/06/2014, sithruk sana <get2jils at gmail.com> wrote:
> How about creating a queue and keep the packet in it, you can get whenever
> you want from queue, and decode it ?.
> On Thu, Jun 19, 2014 at 1:15 AM, Camera Man <i.like.privacy.too at gmail.com>
> wrote:
>> On 06/18/2014 03:54 PM, Slash wrote:
>>   I have tried using av_seek_frame(pFormatCtx, videoStream, 0,
>>>  AVSEEK_FLAG_ANY) to jump back to the beginning but apparently I
>>>  didn't get any new decoded data so it is not doing what I need.
>> You need to flush the decoder context by calling
>> avcodec_flush_buffers(your_codeccontext) after calling av_seek. Also,
>> make sure that your stream starts with an SPS+PPS pair followed by an
>> I-frame. Until you've decoded those, you can't decode any picture. If you
>> seek to the beginning of a properly encoded file, they would be there;
>> however, if the file is not properly encoded, you seek to the middle, or
>> you are using a recorded RTSP stream, they might come later or not at all
>> (in RTSP they may arrive in a side channel)
>> (It is AVCodecContext that references B and P frames, not AVPacket as
>> someone suggested).
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