Miguel Angel Arcos wrote:
>
> 1 - *av_guess_format* asking with "video/mp4" and "h264" or "mpeg" like
> output_example.c. In all cases the function returns NULL.
> 2 - *ByteIOContext* but when I arrive to the function av_open_input_stream
> this crash with an *Access Violation*. I think I init in a good way the
> ByteIOContext and AVFormatContext but I'm not sure about the
> initialitation
> of AVInputFormat and the AVFormatParameters.
>
Here is my function. It works.
int thread_record::init_input(void)
{AVFormatParameters ap;
int r;
input=avformat_alloc_context(); //it is a class member, declared as
AVFormatContext *input;
if(!input) {
return 1;
}
input->iformat=av_find_input_format(m_iformat.c_str()); /* this string
must
be exact format
name. ffmpeg -formats will give you a list of supported formats*/
if(m_iformat=="rawvideo")
m_raw=1;
bio_buffer=(unsigned char *)av_malloc(bio_buffer_size);
if(!bio_buffer) {
av_freep(&input);
return 1;
}
input->pb=av_alloc_put_byte(bio_buffer,bio_buffer_size,0,this,read_packets,NULL,NULL);
if(!input->pb) {
av_freep(&input);
av_freep(&bio_buffer);
return 1;
}
input->pb->is_streamed=1;
input->flags|=AVFMT_NOFILE|AVFMT_FLAG_IGNIDX;
input->flags&=~AVFMT_FLAG_GENPTS;
input->max_index_size=1024*50;
input->max_picture_buffer=1024*100;
//input->debug|=FF_FDEBUG_TS;
memset(&ap, 0, sizeof(ap));
ap.prealloced_context=1;
r=av_open_input_stream(&input,input->pb,"stream",input->iformat,&ap);
_OutputDebugString("av_open_input_stream, r=%d\n",r);
if(r) {
av_freep(&bio_buffer);
av_free(&(input->pb));
av_close_input_stream(input);
input=NULL;
return 1;
}
if(!input->nb_streams){
av_free(bio_buffer);
av_free(input->pb);
av_close_input_stream(input);
input=NULL;
return 2;
}
if(m_raw){
input->streams[0]->codec->width=m_width;
input->streams[0]->codec->height=m_height;
input->streams[0]->codec->pix_fmt=(PixelFormat)m_pixfmt;
}
r=av_find_stream_info(input);
if(r<0) {
av_freep(&bio_buffer);
av_freep(&(input->pb));
av_close_input_stream(input);
input=NULL;
return 2;
}
return 0;
}
Miguel Angel Arcos wrote:
>
> Then maybe I probably do wrong
> anything and make my call to the av_open_input_stream crash.
>
Try adding some printf()' s to the ffmpeg sources and relink your
application with them.
This will give you an overview of what' s happening.
Miguel Angel Arcos wrote:
>
> have this: -9223372036854775808.
>
this is AV_NOPTS_VALUE
Miguel Angel Arcos wrote:
>
> PD: Which NAL Unit of H264 contain the information to know if the data is
> I-frame?? Any knows? I parse all the packets and I don't know where is
> that
> information.
>
Here is the link to the old messages in archives:
http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-February/061496.html
Try to find traces and use this code
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