FFmpeg (C / libav) VPX to mpeg2video stream cannot be played in VLC

Question

I'm currently trying to transcode a VPX video (VP8 / VP9) to mpeg2video and transmit it over UDP using mpegts.

I initialized all contexts and streams, and as long as I pass it to ffplay, it works, if I send a stream to VLC or another player, the receiver displays only the first frame and does nothing. If I do the same through the command line, it works flawlessly - ffmpeg -re -i video.webm -an -f mpegts udp://127.0.0.1:8080

My output context:

 this->output_codec_ctx_->codec_type = AVMEDIA_TYPE_VIDEO; // Set media type this->output_codec_ctx_->pix_fmt = AV_PIX_FMT_YUV420P; // Set stream pixel format this->output_codec_ctx_->time_base.den = ceil(av_q2d(input_stream->r_frame_rate)); // Add the real video framerate. Eg.: 29.9 this->output_codec_ctx_->time_base.num = 1; // Numerator of the framerate. Eg.: num/29.9 this->output_codec_ctx_->width = input_stream->codecpar->width; // Video width this->output_codec_ctx_->height = input_stream->codecpar->height; // Video height this->output_codec_ctx_->bit_rate = 400000; // Video quality this->output_codec_ctx_->gop_size = 12; this->output_codec_ctx_->max_b_frames = 2; this->output_codec_ctx_->framerate = this->input_codec_ctx_->framerate; this->output_codec_ctx_->sample_aspect_ratio = this->input_codec_ctx_->sample_aspect_ratio; 

My av_dump:

 Output #0, mpegts, to 'udp://127.0.0.1:20010': Metadata: encoder : Lavf57.72.101 Stream #0:0: Video: mpeg2video (Main), 1 reference frame, yuv420p, 480x640 (0x0), q=2-31, 400 kb/s, SAR 1:1 DAR 3:4, 24 fps, 24 tbr, 90k tbn 

FFMPEG av_dump:

 Output #0, mpegts, to 'udp://127.0.0.1:20010': Metadata: title : Tears of Steel encoder : Lavf57.72.101 Stream #0:0: Video: mpeg2video (Main), yuv420p, 480x640 [SAR 1:1 DAR 3:4], q=2-31, 200 kb/s, 24 fps, 90k tbn, 24 tbc (default) Metadata: encoder : Lavc57.96.101 mpeg2video Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1 

Any idea on what I can do wrong?