I got a segmentation fault in av_interleaved_write_frame() but the code
works out fine in fine in av_write_frame(). Does anybody have any idea why?
I post a bit snapshots of my code, but just let me know what else you guys
want to see and I will post more code.
This is how I initialize my codec, very similar to output-example.c . I am
writting to an MPEG file, and the format is obtained by av_guess_format().
AVCodecContext *c;
AVStream *st;
st = av_new_stream(oc, 0);
if (!st) {
fprintf(stderr, "Could not alloc stream\n");
exit(1);
}
c = st->codec;
c->codec_id = codec_id;
c->codec_type = AVMEDIA_TYPE_VIDEO;
/* put sample parameters */
c->bit_rate = 400000;
/* resolution must be a multiple of two */
c->width = width;
c->height = height;
/* time base: this is the fundamental unit of time (in seconds) in terms
of which frame timestamps are represented. for fixed-fps content,
timebase should be 1/framerate and timestamp increments should be
identically 1. */
c->time_base.den = 30;
c->time_base.num = 1;
c->gop_size = 12; /* emit one intra frame every twelve frames at most */
c->pix_fmt = PIX_FMT_YUV420P;
c->rc_max_available_vbv_use = 1;
c->rc_max_available_vbv_use = 1;
if (c->codec_id == CODEC_ID_MPEG2VIDEO) {
/* just for testing, we also add B frames */
c->max_b_frames = 2;
}
if (c->codec_id == CODEC_ID_MPEG1VIDEO){
c->mb_decision=2;
}
// some formats want stream headers to be separate
if(oc->oformat->flags & AVFMT_GLOBALHEADER)
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
And this is how to write the video frame.
out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size,
picture);\
if (out_size > 0) {
AVPacket pkt;
av_init_packet(&pkt);
if (c->coded_frame->pts != AV_NOPTS_VALUE)
pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base,
st->time_base);
if(c->coded_frame->key_frame)
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.stream_index= st->index;
pkt.data= video_outbuf;
pkt.size= out_size;
/* write the compressed frame in the media file */
AVPacket outpkt;
// seg fault would happen here.
//ret = av_interleaved_write_frame(oc, &pkt);
ret = av_write_frame(oc, &pkt);
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