Hi guys
So I am writing a decoder that reads rtp video packets from the network,
but I am running into a problem where since av_read_frame is a blocking
function ( doesn't return until it actually reads something ) so that
means if the remote end suddenly stops sending video then my program
would get stuck on av_read_frame. Is there a way to make av_read_frame
to be nonblocking? I tried to set the AVFMT_FLAG_NONBLOCK, but it
doesn't seem to work, then again I am not sure if I am doing it
correctly. Here is what I did
Start_Decode()
{
av_register_all();
// Open video file
if(av_open_input_file(&pInFormatCtx, "stream.sdp", NULL, 0,
NULL)!=0) {
exit( 2 );
}
// Retrieve stream information
if(av_find_stream_info(pInFormatCtx)<0) {
exit( 3 );
}
// Find the first video stream
videoStream=-1;
for(int i=0; i<(int) pInFormatCtx->nb_streams; i++)
if(
pInFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO) {
videoStream=i;
break;
}
if( videoStream==-1 ) {
exit( 4 );
}
// Get a pointer to the codec context for the video stream
pInCodecCtx=pInFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pInCodec=avcodec_find_decoder( pInCodecCtx->codec_id );
if( pInCodec==NULL ) {
fprintf(stderr, "Unsupported codec!\n");
exit( 5 );
}
// Open codec
if(avcodec_open( pInCodecCtx, pInCodec ) < 0 ) {
exit( 6 );
}
// Allocate video frame
pInFrame=avcodec_alloc_frame();
pInFormatCtx->flags |= AVFMT_FLAG_NONBLOCK;
// Read frames and save first five frames to disk
while( av_read_frame(pInFormatCtx, &Inpacket)>=0 &&
ThreadIsRunning ) {
// Is this a packet from the video stream?
if(Inpacket.stream_index==videoStream) {
// Decode video frame
avcodec_decode_video(pInCodecCtx, pInFrame,
&frameFinished,
Inpacket.data,
Inpacket.size);
.
.
.
}
Any help would be greatly appreciated Thanks.
Xin Cai
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