Yes you are right.
I am connecting to a server sending Mpeg4 video frames and mp2 audio.
I am trying to define if my video is ok before the creation of the avi
output file.
So the video data should contain what I think is my encoded mpeg4 video
frame and I believe I access this from my packet pointer AVPacket * pkt as
pkt->data with its size pkt->size.
The frames are obtained thrugh the api call av_read_frame(inputContext,
&pkt)
And the packet I am trying to dump is obtained from
memset(opkt, 0, sizeof(AVPacket));
av_init_packet(opkt);
/* no reencoding needed : output the packet directly */
if (ost->st->codec->codec_type == CODEC_TYPE_AUDIO)
audio_size += pkt->size;
else if (ost->st->codec->codec_type == CODEC_TYPE_VIDEO)
video_size += pkt->size;
else
{
send_log(USER, ERROR, "unknown codec type %d ",
ost->st->codec->codec_type );
//write_log_t2("unknown codec type",__LINE__,__FILE__);
return -1;
}
opkt->stream_index = ost->index;
if (pkt->pts != (unsigned int)AV_NOPTS_VALUE)
{
opkt->pts = av_rescale_q(av_rescale_q(pkt->pts, ist_time_base,
AV_TIME_BASE_Q) + ts_offset, AV_TIME_BASE_Q, ost->st->time_base);
dts = av_rescale_q(pkt->dts, ist_time_base, AV_TIME_BASE_Q);
}
else
{
opkt->pts= AV_NOPTS_VALUE;
dts = 0;
}
opkt->dts = av_rescale_q(dts + ts_offset, AV_TIME_BASE_Q,
ost->st->time_base);
opkt->flags = pkt->flags;
opkt->data = pkt->data;
opkt->size = pkt->size;
// Write frame
ret = av_interleaved_write_frame(outputContext, opkt);
so basically the content of opkt->data is what I assume is the mpeg4
encoded video frame.
Hope this clarifies my question.
And thanks for your answer.
On Thu, May 7, 2009 at 6:40 PM, Mark Heath <[email protected]> wrote:
>
> On 08/05/2009, at 7:51 AM, Alejandro Oyarbide wrote:
>
>>
>> I based on the structure above and the packets I passed to
>> av_interleaved_write_frame were copied considering size and data assuming
>> this was pure VIDEO info.
>>
>> But aparently this is not the case.
>>
>> My question is how to get the VIDEO raw data from a particular AVPacket.
>>
>
> I think your question is unclear.
>
> What do you mean by raw VIDEO data? Do you mean?
>
> Uncompressed frame image.
> Compressed Packet data.
> Meta data, such as display time stamp, dimensions, frame rate, interlaced
> etc.
>
> Let us know so we can help further.
> Mark
> _______________________________________________
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>
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