I also tried this build, I'm getting the following error:
2017-09-19 20:20:49.814 [ INFO] subscription: 001C: "HTTP" subscribing on channel "sixx Austria", adapter: "TechnoTrend S2-4600", network: "Astra 19,2", mux: "12662.75H", provider: "sevenonemedia", service: "sixx Austria", profile="webtv-omx-aac-mp4", hostname="10.0.0.6", client="Mozilla/5.0 (Windows NT 6.1; rv:55.0) Gecko/20100101 Firefox/55.0"
2017-09-19 20:20:50.326 [ INFO] transcode: 0002: 01:MPEG2VIDEO: ==> Using profile omx_rpi
2017-09-19 20:20:50.327 [ INFO] transcode: 0002: 02:MPEG2AUDIO: ==> Using profile webtv-aac
2017-09-19 20:20:50.970 [ INFO] libav: AVCodecContext: Changing output format.
2017-09-19 20:20:51.000 [ INFO] libav: AVCodecContext: Using OMX.broadcom.video_encode
2017-09-19 20:20:55.575 [WARNING] libav: AVFormatContext: Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
2017-09-19 20:20:55.575 [WARNING] libav: AVFormatContext: track 0: codec frame size is not set
2017-09-19 20:21:07.369 [WARNING] webui: Stop streaming /stream/channel/59d9a3a58c910bfa7557275bdb506242?profile=webtv-vp8-vorbis-webm, muxer reported errors
2017-09-19 20:21:07.369 [ INFO] subscription: 001C: "HTTP" unsubscribing from "sixx Austria", hostname="10.0.0.6", client="Mozilla/5.0 (Windows NT 6.1; rv:55.0) Gecko/20100101 Firefox/55.0"
2017-09-19 20:21:07.401 [ INFO] libav: AVCodecContext: Qavg: 118.000
2017-09-19 20:21:07.405 [WARNING] libav: AVCodecContext: 2 frames left in the queue on closing