Stephen, sorry to bother you again. I've looked over your instructions
and snippets in the "Output mpeg-ts to rtp" thread from last year.
After making the necessary changes to my setup and sending, and I'm
getting a memory error when I attempt to write my second packet. I've
written more details below, in the packet sending section to highlight
where my problem happens.
Notes:
Init code (I've stripped out error codes and objective c code):
------------------------------------------------------------------------------------
// context for the actual stream, this is step 1&2
actualContext = avformat_alloc_context();
url_open_dyn_buf(&ioContext)
actualContext->pb = ioContext;
actualContext->oformat = av_guess_format("mpegts", NULL, NULL);
actualStream = av_new_stream(actualContext, 0);
// encoder, part of step 1
codec = avcodec_find_encoder(CODEC_ID_MPEG4);
codecContext = actualStream->codec;
codecContext->bit_rate = 400000;
codecContext->width = CIF_WIDTH;
codecContext->height = CIF_HEIGHT;
codecContext->time_base = (AVRational){1,FRAME_RATE};
codecContext->gop_size = 10;
codecContext->max_b_frames = 1;
codecContext->pix_fmt = PIX_FMT_YUV420P;
avcodec_open(codecContext, codec);
// rtp out, step 3
rtpContext = avformat_alloc_context();
rtpContext->oformat = av_guess_format("rtp", NULL, NULL);
snprintf(rtpContext->filename, sizeof(rtpContext->filename),
"%s://%s:%d", "rtp", IP_ADDRESS, PORT_NUM);
tsrtpStream = av_new_stream(rtpContext, 0);
avcodec_get_context_defaults(tsrtpStream->codec);
tsrtpStream->codec->codec_id = CODEC_ID_MPEG2TS;
rtpContext->audio_codec_id = CODEC_ID_NONE;
rtpContext->video_codec_id = CODEC_ID_MPEG2TS;
av_set_parameters(rtpContext,NULL);
url_fopen(&rtpContext->pb, rtpContext->filename, URL_WRONLY);
// write header, step 4
av_write_header(rtpContext);
av_write_header(actualContext);
------------------------------------------
Here's my packet code:
------------------------------------------
// step 5
AVPacket actualPkt;
AVPacket tsrtpPkt;
av_init_packet(&actualPkt);
av_init_packet(&tsrtpPkt);
AVCodecContext *streamCodec = actualStream->codec;
if(streamCodec->coded_frame->pts != AV_NOPTS_VALUE)
actualPkt.pts = av_rescale_q(streamCodec->coded_frame->pts,
streamCodec->time_base, actualStream->time_base);
if(streamCodec->coded_frame->key_frame)
actualPkt.flags |= PKT_FLAG_KEY;
actualPkt.stream_index = actualStream->index;
actualPkt.data = encodedFrame;
actualPkt.size = encodedSize;
// <---- This is where I get an error. This line works the first time
it is called,
// <---- and one packet is successfully written into the buffer. It
fails for my next attempt
// <---- to write a frame. Error is EXC_BAD_ACCESS, which is usually
the result of trying
// <---- to write into deallocated memory.
result = av_interleaved_write_frame(actualContext, &actualPkt);
if(result < 0){
// error handling
}
// <---- Could this be the what's wrong? After url_close_dyn_buf, do I
have to reinitialize
// <---- ioContext again? If this is the case, how can I reinitialize
ioContext safely?
NSInteger tsSize = url_close_dyn_buf(ioContext, &tsBuffer);
tsrtpPkt.size = tsSize;
tsrtpPkt.data = tsBuffer;
result = av_interleaved_write_frame(rtpContext, &tsrtpPkt);
if(result < 0){
// error handling
}
------------------------------------------
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