Transcode to file works, but not transcode to stream

This command works:
 ./ffmpeg -i udp://239.192.16.18:52444  -max_error_rate 1.0 -f mpegts  -c:v libx264 test.mpg

This one crashes

./ffmpeg -i udp://239.192.16.18:52444  -max_error_rate 1.0 -f mpegts  -c:v libx264 http://172.17.0.162:61234/feed1.ffm

[hevc @ 0xbae9de0] Could not find ref with POC 87
[hevc @ 0xbae9de0] Could not find ref with POC 89
av_interleaved_write_frame(): Broken pipe time=00:00:00.92 bitrate=   0.0kbits/s speed=1.58x
Error writing trailer of http://172.17.0.162:61234/feed1.ffm: Broken pipeframe=   57 fps= 32 q=31.0 Lsize=       5kB time=00:00:01.56 bitrate=  27.8kbits/s speed=0.869x
video:1kB audio:52kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[libx264 @ 0xbb3f4a0] frame I:2     Avg QP:19.74  size:  9437
[libx264 @ 0xbb3f4a0] frame P:15    Avg QP:24.46  size:  8181
[libx264 @ 0xbb3f4a0] frame B:40    Avg QP:25.17  size:  1442
[libx264 @ 0xbb3f4a0] consecutive B-frames:  3.5%  7.0%  5.3% 84.2%
[libx264 @ 0xbb3f4a0] mb I  I16..4: 40.4% 57.2%  2.4%
[libx264 @ 0xbb3f4a0] mb P  I16..4: 10.5%  9.3%  0.3%  P16..4: 33.7%  4.9%  1.7%  0.0%  0.0%    skip:39.6%
[libx264 @ 0xbb3f4a0] mb B  I16..4:  0.2%  0.2%  0.0%  B16..8: 20.4%  0.7%  0.1%  direct: 0.2%  skip:78.2%  L0:47.0% L1:50.9% BI: 2.1%
[libx264 @ 0xbb3f4a0] 8x8 transform intra:50.5% inter:96.6%
[libx264 @ 0xbb3f4a0] coded y,uvDC,uvAC intra: 18.3% 26.9% 9.0% inter: 4.0% 5.0% 0.1%
[libx264 @ 0xbb3f4a0] i16 v,h,dc,p: 23% 51%  9% 17%
[libx264 @ 0xbb3f4a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 30% 23%  2%  4%  4%  5%  3%  4%
[libx264 @ 0xbb3f4a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 30% 13%  4%  9%  7%  8%  4%  4%
[libx264 @ 0xbb3f4a0] i8c dc,h,v,p: 61% 22% 12%  5%
[libx264 @ 0xbb3f4a0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0xbb3f4a0] ref P L0: 66.8% 11.9% 15.0%  6.3%
[libx264 @ 0xbb3f4a0] ref B L0: 89.2%  8.9%  1.9%
[libx264 @ 0xbb3f4a0] ref B L1: 95.7%  4.3%
[libx264 @ 0xbb3f4a0] kb/s:1647.44
Conversion failed!



Here is the ffserver.conf:
<Feed feed1.ffm>
 File /home/core/tonyh/feed1.ffm
 FileMaxSize 1G
 ACL allow localhost

</Feed>


##################################################################
# Now you can define each stream which will be generated from the
# original audio and video stream. Each format has a filename (here
# 'test1.mpg'). FFServer will send this stream when answering a
# request containing this filename.


<Stream live.x265>
  #format matroska
  Format mpegts
  #File "/home/habibt/projects/airlines/Southwest/sintel-1080-cfg02.mkv"

# coming from live feed 'feed1'
 Feed feed1.ffm
 #VideoCodec libx264
 VideoCodec h264_vaapi
 VideoFrameRate 30
 VideoBitRate  800
 VideoSize 720x480
 #AVOptionVideo crf 23
 #AVOptionVideo preset medium
 AVOptionVideo me_range 16
 AVOptionVideo qdiff 4
 AVOptionVideo qmin 10
 AVOptionVideo qmax 51
 AVOptionVideo flags +global_header

 AudioCodec aac
 Strict -2
 AudioBitRate 128
 AudioChannels 2
 AudioSampleRate 44100
 AVOptionAudio flags +global_header

</Stream>