Tvheadend

I'm using Jalle19's script to convert external videos to a stream tvheadend understands.
The code can be found here, btw: https://github.com/Jalle19/node-ffmpeg-mpegts-proxy

I then add a mux to my IPTV network, like this:

URL: http://localhost:3048/vtm
    MUX Name: VTM
    Service Name: VTM

Then I see it makes a request to that URL:

2015-09-03 16:06:41.591 [  DEBUG]:mpegts: Selectsat - adding mux VTM in Selectsat to scan queue weight 6 flags 4000
2015-09-03 16:06:41.591 [  DEBUG]:settings: saving to /home/barabas/tvh4/input/iptv/networks/954bfbb438b81253b255af5668eaa3d9/muxes/0389598825493ce8c684b468af1b7c22/config
2015-09-03 16:06:41.592 [  DEBUG]:mpegts: VTM in Selectsat - add raw service
2015-09-03 16:06:41.592 [  DEBUG]:service: 1: VTM in Selectsat si 0xbc2210 <unknown> weight 0 prio 1 error 0
2015-09-03 16:06:41.592 [   INFO]:mpegts: VTM in Selectsat - tuning on IPTV
2015-09-03 16:06:41.592 [  DEBUG]:mpegts: VTM in Selectsat - started
2015-09-03 16:06:41.592 [  DEBUG]:mpegts: VTM in Selectsat - open PID 0039 (57) [16/0xdda090]
2015-09-03 16:06:41.592 [  DEBUG]:mpegts: VTM in Selectsat - open PID 0BBA (3002) [16/0xe2c060]
2015-09-03 16:06:41.592 [  DEBUG]:mpegts: VTM in Selectsat - open PID 0BBB (3003) [16/0xe2d4d0]
2015-09-03 16:06:41.593 [  DEBUG]:mpegts: VTM in Selectsat - open PID 0012 (18) [20/0xe2e940]
2015-09-03 16:06:41.593 [  DEBUG]:mpegts: VTM in Selectsat - open PID tables subscription [0042/0xcd44a0]
2015-09-03 16:06:41.593 [   INFO]:subscription: 000E: "scan" subscribing to mux "VTM", weight: 6, adapter: "IPTV", network: "Selectsat", service: "Raw PID Subscription" 

But immediately after that it closes the request.
The node-proxy process never has any time to actually respond with the data,
which it starts to return right after the disconnect.

Even more strange: sometimes it does not close the connection and it works.
A succesful scan looks like this:

2015-09-03 16:10:38.615 [  DEBUG]:mpegts: Selectsat - adding mux Vijf in Selectsat to scan queue weight 6 flags 4000
2015-09-03 16:10:38.615 [  DEBUG]:settings: saving to /home/barabas/tvh4/input/iptv/networks/954bfbb438b81253b255af5668eaa3d9/muxes/d5dd3bd1b1ae0fcf9bb400b998df895a/config
2015-09-03 16:10:38.616 [  DEBUG]:mpegts: Vijf in Selectsat - add raw service
2015-09-03 16:10:38.616 [  DEBUG]:service: 1: Vijf in Selectsat si 0x23eb700 <unknown> weight 0 prio 1 error 0
2015-09-03 16:10:38.616 [   INFO]:mpegts: Vijf in Selectsat - tuning on IPTV
2015-09-03 16:10:38.617 [  DEBUG]:mpegts: Vijf in Selectsat - started
2015-09-03 16:10:38.617 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0039 (57) [16/0x25f8c80]
2015-09-03 16:10:38.617 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0BBA (3002) [16/0x25fa0f0]
2015-09-03 16:10:38.617 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0BBB (3003) [16/0x25fb560]
2015-09-03 16:10:38.617 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0012 (18) [20/0x25fc9d0]
2015-09-03 16:10:38.617 [  DEBUG]:mpegts: Vijf in Selectsat - open PID tables subscription [0042/0x260d3d0]
2015-09-03 16:10:38.617 [   INFO]:subscription: 0002: "scan" subscribing to mux "Vijf", weight: 6, adapter: "IPTV", network: "Selectsat", service: "Raw PID Subscription" 
2015-09-03 16:10:39.849 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0000 (0) [20/0x7f1568011b70]
2015-09-03 16:10:39.849 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0001 (1) [16/0x7f1568013140]
2015-09-03 16:10:39.849 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0010 (16) [16/0x7f1568014710]
2015-09-03 16:10:39.849 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0011 (17) [20/0x7f1568015ce0]
2015-09-03 16:10:39.849 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 0011 (17) [16/0x7f15680172b0]
2015-09-03 16:10:39.849 [  DEBUG]:service: Vijf in Selectsat: Status changed to [Demuxed packets] 
2015-09-03 16:10:39.849 [  DEBUG]:service: Vijf in Selectsat: Status changed to [Demuxed packets] [Reassembled packets] 
2015-09-03 16:10:39.849 [  DEBUG]:sdt: onid 0001 (1) tsid 0001 (1)
2015-09-03 16:10:39.849 [  DEBUG]:sdt: mux Vijf in Selectsat
2015-09-03 16:10:39.849 [  DEBUG]:sdt:   sid 0001 (1) running 4 free_ca 0
2015-09-03 16:10:39.849 [  DEBUG]:pat: tsid 0001 (1)
2015-09-03 16:10:39.849 [  DEBUG]:pat:   sid 0001 (1) on pid 1000 (4096)
2015-09-03 16:10:39.849 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 1000 (4096) [16/0x7f1560000b50]
2015-09-03 16:10:39.849 [  DEBUG]:pat:   sid 2AB1 (10929) on pid 04B2 (1202)
2015-09-03 16:10:39.849 [  DEBUG]:mpegts: Vijf in Selectsat - open PID 04B2 (1202) [16/0x7f1560002120]
2015-09-03 16:10:39.849 [  DEBUG]:pat: completed pid 0 table 00000000 / 00000000
2015-09-03 16:10:40.041 [  DEBUG]:pmt: sid 0001 (1)
2015-09-03 16:10:40.041 [  DEBUG]:pmt:   pcr_pid 0100
2015-09-03 16:10:40.041 [  DEBUG]:pmt:   pid 0100 estype 27
2015-09-03 16:10:40.041 [  DEBUG]:pmt:   type H264 position 0
2015-09-03 16:10:40.041 [  DEBUG]:pmt:   pid 0101 estype 15
2015-09-03 16:10:40.041 [  DEBUG]:pmt:   type AAC-LATM position 0
2015-09-03 16:10:40.041 [  DEBUG]:pmt: completed pid 4096 table 00000002 / 000000ff
2015-09-03 16:10:40.041 [  DEBUG]:mpegts: Vijf in Selectsat - close PID 1000 (4096) [16/0x7f1560000b50]
2015-09-03 16:10:40.315 [  DEBUG]:sdt: completed pid 17 table 00000040 / 000000f8

And no, it's not always the same channels that work.

So, does anyone know what's going on here?