Cannot output to ffserver if using -filter_complex overlay

[dvdme]

I was trying to use filter_complex to make an overlay.
The command works fine if I output to file but if output it to ffserver it fails with an unknown error.

FFMpeg output bellow:

ffmpeg started on 2017-11-28 at 17:57:53
Report written to "ffmpeg-20171128-175753.log"
Command line:
ffmpeg.exe -report -v 9 -loglevel 99 -video_size 1280x720 -r 30 -pix_fmt yuv420p -loop 1 -i "c:
temp
black_frame_x_red.png" -f dshow -i "video=Video (00-2 Pro Capture Quad HDMI):audio=Audio (2- 00-2 Pro Capture Quad" -force_key_frames "expr:gte(t,n_forced*0.1)" -filter_complex "[0:v][1:v]overlay=[video]" -map "[video]" -f mpegts ​http://192.168.2.5:8090/Mini3.ffm
ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers

built with gcc 6.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil 55. 34.101 / 55. 34.101
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.101 / 57. 56.101
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100

Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-v' ... matched as option 'v' (set logging level) with argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '99'.
Reading option '-video_size' ... matched as AVOption 'video_size' with argument '1280x720'.
Reading option '-r' ... matched as option 'r' (set frame rate (Hz value, fraction or abbreviation)) with argument '30'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv420p'.
Reading option '-loop' ... matched as AVOption 'loop' with argument '1'.
Reading option '-i' ... matched as input url with argument 'c:\temp\black_frame_x_red.png'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'dshow'.
Reading option '-i' ... matched as input url with argument 'video=Video (00-2 Pro Capture Quad HDMI):audio=Audio (2- 00-2 Pro Capture Quad'.
Reading option '-force_key_frames' ... matched as option 'force_key_frames' (force key frames at specified timestamps) with argument 'expr:gte(t,n_forced*0.1)'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '[0:v][1:v]overlay=[video]'.
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '[video]'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'mpegts'.
Reading option '​http://192.168.2.5:8090/Mini3.ffm' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Applying option v (set logging level) with argument 9.
Applying option loglevel (set logging level) with argument 99.
Applying option filter_complex (create a complex filtergraph) with argument [0:v][1:v]overlay=[video].
Successfully parsed a group of options.
Parsing a group of options: input url c:\temp\black_frame_x_red.png.
Applying option r (set frame rate (Hz value, fraction or abbreviation)) with argument 30.
Applying option pix_fmt (set pixel format) with argument yuv420p.
Successfully parsed a group of options.
Opening an input file: c:\temp\black_frame_x_red.png.
[file @ 000000000074a900] Setting default whitelist 'file,crypto'
[png_pipe @ 000000000074a0e0] Format png_pipe probed with size=2048 and score=99
[png_pipe @ 000000000074a0e0] Before avformat_find_stream_info() pos: 0 bytes read:32768 seeks:0 nb_streams:1
[png_pipe @ 000000000074a0e0] Probe buffer size limit of 5000000 bytes reached
[png_pipe @ 000000000074a0e0] After avformat_find_stream_info() pos: 58975 bytes read:5012875 seeks:84 frames:85
Input #0, png_pipe, from 'c:\temp\black_frame_x_red.png':

Duration: N/A, bitrate: N/A

Stream #0:0, 85, 1/25: Video: png, 1 reference frame, yuv420p(pc), 1280x720, 0/1, 25 fps, 25 tbr, 25 tbn, 25 tbc

Successfully opened the file.
Parsing a group of options: input url video=Video (00-2 Pro Capture Quad HDMI):audio=Audio (2- 00-2 Pro Capture Quad.
Applying option f (force format) with argument dshow.
Successfully parsed a group of options.
Opening an input file: video=Video (00-2 Pro Capture Quad HDMI):audio=Audio (2- 00-2 Pro Capture Quad.
[dshow @ 00000000003527a0] Selecting pin Capture on video
[dshow @ 00000000003527a0] not reusing previous graph capture filter @device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\Audio (2- 00-2 Pro Capture Quad != @device_pnp_
?\pci#ven_1cd7&dev_0010&subsys_00020001&rev_01#6&1b74d3ec&0&00380008#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\video
[dshow @ 00000000003527a0] Selecting pin Capture on audio only
dshow passing through packet of type video size 4147200 timestamp 983176640000 orig timestamp 983176641708 graph timestamp 983176640000 diff -1708 Video (00-2 Pro Capture Quad HDMI)
dshow passing through packet of type video size 4147200 timestamp 983176840000 orig timestamp 983176841721 graph timestamp 983176840000 diff -1721 Video (00-2 Pro Capture Quad HDMI)
[dshow @ 00000000003527a0] Probe buffer size limit of 5000000 bytes reached
Guessed Channel Layout for Input Stream #1.1 : stereo
Input #1, dshow, from 'video=Video (00-2 Pro Capture Quad HDMI):audio=Audio (2- 00-2 Pro Capture Quad':

Duration: N/A, start: 98317.664000, bitrate: N/A

Stream #1:0, 2, 1/10000000: Video: rawvideo, 1 reference frame (YUY2 / 0x32595559), yuyv422, 1920x1080, 0/1, 50 fps, 50 tbr, 10000k tbn, 10000k tbc
Stream #1:1, 0, 1/10000000: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s

Successfully opened the file.
detected 8 logical cores
Parsing a group of options: output url ​http://192.168.2.5:8090/Mini3.ffm.
Applying option force_key_frames (force key frames at specified timestamps) with argument expr:gte(t,n_forced*0.1).
Applying option map (set input stream mapping) with argument [video].
Applying option f (force format) with argument mpegts.
Successfully parsed a group of options.
Opening an output file: ​http://192.168.2.5:8090/Mini3.ffm.
[http @ 0000000002d96ac0] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy'
[http @ 0000000002d96ac0] request: POST /Mini3.ffm HTTP/1.1

Transfer-Encoding: chunked

User-Agent: Lavf/57.56.101

Accept: */*

Connection: close

Host: 192.168.2.5:8090

Icy-MetaData: 1

Successfully opened the file.
[graph 0 input from stream 0:0 @ 0000000002a8a660] Setting 'video_size' to value '1280x720'
[graph 0 input from stream 0:0 @ 0000000002a8a660] Setting 'pix_fmt' to value '0'
[graph 0 input from stream 0:0 @ 0000000002a8a660] Setting 'time_base' to value '1/30'
[graph 0 input from stream 0:0 @ 0000000002a8a660] Setting 'pixel_aspect' to value '0/1'
[graph 0 input from stream 0:0 @ 0000000002a8a660] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0000000002a8a660] Setting 'frame_rate' to value '30/1'
[graph 0 input from stream 0:0 @ 0000000002a8a660] w:1280 h:720 pixfmt:yuv420p tb:1/30 fr:30/1 sar:0/1 sws_param:flags=2
[force CFR for input from stream 0:0 @ 00000000003c9a00] Setting 'expr' to value 'N'
[graph 0 input from stream 1:0 @ 00000000003c9e60] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 1:0 @ 00000000003c9e60] Setting 'pix_fmt' to value '1'
[graph 0 input from stream 1:0 @ 00000000003c9e60] Setting 'time_base' to value '1/10000000'
[graph 0 input from stream 1:0 @ 00000000003c9e60] Setting 'pixel_aspect' to value '0/1'
[graph 0 input from stream 1:0 @ 00000000003c9e60] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 1:0 @ 00000000003c9e60] Setting 'frame_rate' to value '10000000/199983'
[graph 0 input from stream 1:0 @ 00000000003c9e60] w:1920 h:1080 pixfmt:yuyv422 tb:1/10000000 fr:10000000/199983 sar:0/1 sws_param:flags=2
[format @ 0000000002a8ba80] compat: called with args=[yuv420p|yuv422p]
[format @ 0000000002a8ba80] Setting 'pix_fmts' to value 'yuv420p|yuv422p'
[auto-inserted scaler 0 @ 0000000002a8bda0] w:iw h:ih flags:'bilinear' interl:0
[Parsed_overlay_0 @ 0000000002a8a340] auto-inserting filter 'auto-inserted scaler 0' between the filter 'graph 0 input from stream 1:0' and the filter 'Parsed_overlay_0'
[AVFilterGraph @ 0000000002a7e680] query_formats: 6 queried, 4 merged, 1 already done, 0 delayed
[graph 0 input from stream 0:0 @ 0000000002a8a660] TB:0.033333 FRAME_RATE:30.000000 SAMPLE_RATE:nan
[auto-inserted scaler 0 @ 0000000002a8bda0] w:1920 h:1080 fmt:yuyv422 sar:0/1 -> w:1920 h:1080 fmt:yuva420p sar:0/1 flags:0x2
[Parsed_overlay_0 @ 0000000002a8a340] main w:1280 h:720 fmt:yuv420p overlay w:1920 h:1080 fmt:yuva420p eof_action:repeat
[Parsed_overlay_0 @ 0000000002a8a340] [framesync @ 0000000002a8a448] Selected 1/1000000 time base
[Parsed_overlay_0 @ 0000000002a8a340] [framesync @ 0000000002a8a448] Sync level 2
[mpeg2video @ 00000000003c3fe0] intra_quant_bias = 96 inter_quant_bias = 0
[mpegts @ 0000000002d95720] muxrate VBR, pcr every 3 pkts, sdt every 200, pat/pmt every 40 pkts
Output #0, mpegts, to '​http://192.168.2.5:8090/Mini3.ffm':

Metadata:

encoder : Lavf57.56.101
Stream #0:0, 0, 1/90000: Video: mpeg2video (Main), 1 reference frame, yuv420p, 1280x720, 0/1, q=2-31, 200 kb/s, 30 fps, 90k tbn, 30 tbc (default)
Metadata:

encoder : Lavc57.64.101 mpeg2video

Side data:

dshow passing through packet of type video size 4147200 timestamp 983177040000 orig timestamp 983177041463 graph timestamp 983177040000 diff -1463 Video (00-2 Pro Capture Quad HDMI)

cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1

Stream mapping:

Stream #0:0 (png) -> overlay:main
Stream #1:0 (rawvideo) -> overlay:overlay
overlay -> Stream #0:0 (mpeg2video)

Press [q] to stop, ? for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
Input stream #0:0 frame changed from size:1280x720 fmt:yuv420p to size:1920x1080 fmt:pal8
[graph 0 input from stream 0:0 @ 00000000003ce1c0] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 0:0 @ 00000000003ce1c0] Setting 'pix_fmt' to value '11'
[graph 0 input from stream 0:0 @ 00000000003ce1c0] Setting 'time_base' to value '1/30'
[graph 0 input from stream 0:0 @ 00000000003ce1c0] Setting 'pixel_aspect' to value '3778/3778'
[graph 0 input from stream 0:0 @ 00000000003ce1c0] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 00000000003ce1c0] Setting 'frame_rate' to value '30/1'
[graph 0 input from stream 0:0 @ 00000000003ce1c0] w:1920 h:1080 pixfmt:pal8 tb:1/30 fr:30/1 sar:3778/3778 sws_param:flags=2
[force CFR for input from stream 0:0 @ 00000000003ce280] Setting 'expr' to value 'N'
[graph 0 input from stream 1:0 @ 00000000003ce360] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 1:0 @ 00000000003ce360] Setting 'pix_fmt' to value '1'
[graph 0 input from stream 1:0 @ 00000000003ce360] Setting 'time_base' to value '1/10000000'
[graph 0 input from stream 1:0 @ 00000000003ce360] Setting 'pixel_aspect' to value '0/1'
[graph 0 input from stream 1:0 @ 00000000003ce360] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 1:0 @ 00000000003ce360] Setting 'frame_rate' to value '10000000/199983'
[graph 0 input from stream 1:0 @ 00000000003ce360] w:1920 h:1080 pixfmt:yuyv422 tb:1/10000000 fr:10000000/199983 sar:0/1 sws_param:flags=2
[scaler for output stream 0:0 @ 00000000003ce500] Setting 'w' to value '1280'
[scaler for output stream 0:0 @ 00000000003ce500] Setting 'h' to value '720'
[scaler for output stream 0:0 @ 00000000003ce500] Setting 'flags' to value 'bicubic'
[scaler for output stream 0:0 @ 00000000003ce500] w:1280 h:720 flags:'bicubic' interl:0
[format @ 00000000003ce5c0] compat: called with args=[yuv420p]
[format @ 00000000003ce5c0] Setting 'pix_fmts' to value 'yuv420p'
[auto-inserted scaler 0 @ 00000000003ce6a0] w:iw h:ih flags:'bilinear' interl:0
dshow passing through packet of type video size 4147200 timestamp 983177240000 orig timestamp 983177241509 graph timestamp 983177240000 diff -1509 Video (00-2 Pro Capture Quad HDMI)
[Parsed_overlay_0 @ 00000000003ce0e0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'graph 0 input from stream 1:0' and the filter 'Parsed_overlay_0'
[dshow @ 00000000003527a0] real-time buffer [Video (00-2 Pro Capture Quad HDMI)] [video input] too full or near too full (136% of size: 3041280 [rtbufsize parameter])! frame dropped!
[auto-inserted scaler 1 @ 00000000003ce840] w:iw h:ih flags:'bilinear' interl:0
[force CFR for input from stream 0:0 @ 00000000003ce280] auto-inserting filter 'auto-inserted scaler 1' between the filter 'graph 0 input from stream 0:0' and the filter 'force CFR for input from stream 0:0'
[AVFilterGraph @ 0000000002a7e680] query_formats: 7 queried, 4 merged, 2 already done, 0 delayed
[auto-inserted scaler 1 @ 00000000003ce840] w:1920 h:1080 fmt:pal8 sar:3778/3778 -> w:1920 h:1080 fmt:yuva420p sar:1/1 flags:0x2
[auto-inserted scaler 1 @ 00000000003ce840] TB:0.033333 FRAME_RATE:30.000000 SAMPLE_RATE:nan
[auto-inserted scaler 0 @ 00000000003ce6a0] w:1920 h:1080 fmt:yuyv422 sar:0/1 -> w:1920 h:1080 fmt:yuva420p sar:0/1 flags:0x2
[Parsed_overlay_0 @ 00000000003ce0e0] main w:1920 h:1080 fmt:yuva420p overlay w:1920 h:1080 fmt:yuva420p eof_action:repeat
[Parsed_overlay_0 @ 00000000003ce0e0] [framesync @ 0000000002e6ce08] Selected 1/1000000 time base
[Parsed_overlay_0 @ 00000000003ce0e0] [framesync @ 0000000002e6ce08] Sync level 2
[scaler for output stream 0:0 @ 00000000003ce500] w:1920 h:1080 fmt:yuva420p sar:1/1 -> w:1280 h:720 fmt:yuv420p sar:1/1 flags:0x4
[Parsed_overlay_0 @ 00000000003ce0e0] Incoming frame (time:0) from link #0
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[rawvideo @ 0000000002d949c0] PACKET SIZE: 4147200, STRIDE: 3840
[Parsed_overlay_0 @ 00000000003ce0e0] Incoming frame (time:0) from link #1
[Parsed_overlay_0 @ 00000000003ce0e0] n:1.000000 t:0.000000 pos:0.000000 x:0.000000 xi:0 y:0.000000 yi:0
dshow passing through packet of type video size 4147200 timestamp 983177440000 orig timestamp 983177441693 graph timestamp 983177440000 diff -1693 Video (00-2 Pro Capture Quad HDMI)
[dshow @ 00000000003527a0] real-time buffer [Video (00-2 Pro Capture Quad HDMI)] [video input] too full or near too full (136% of size: 3041280 [rtbufsize parameter])! frame dropped!
Clipping frame in rate conversion by 0.000008
Forced keyframe at time 0.000000
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
dshow passing through packet of type video size 4147200 timestamp 983177640000 orig timestamp 983177641630 graph timestamp 983177640000 diff -1630 Video (00-2 Pro Capture Quad HDMI)
[dshow @ 00000000003527a0] real-time buffer [Video (00-2 Pro Capture Quad HDMI)] [video input] too full or near too full (136% of size: 3041280 [rtbufsize parameter])! frame dropped!
[Parsed_overlay_0 @ 00000000003ce0e0] Incoming frame (time:0.0333333) from link #0
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[rawvideo @ 0000000002d949c0] PACKET SIZE: 4147200, STRIDE: 3840
[Parsed_overlay_0 @ 00000000003ce0e0] Incoming frame (time:0.02) from link #1
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[rawvideo @ 0000000002d949c0] PACKET SIZE: 4147200, STRIDE: 3840
[Parsed_overlay_0 @ 00000000003ce0e0] Incoming frame (time:0.04) from link #1
[Parsed_overlay_0 @ 00000000003ce0e0] n:2.000000 t:0.033333 pos:0.000000 x:0.000000 xi:0 y:0.000000 yi:0
dshow passing through packet of type video size 4147200 timestamp 983177840000 orig timestamp 983177841555 graph timestamp 983177840000 diff -1555 Video (00-2 Pro Capture Quad HDMI)
[Parsed_overlay_0 @ 00000000003ce0e0] Incoming frame (time:0.0666667) from link #0
[rawvideo @ 0000000002d949c0] PACKET SIZE: 4147200, STRIDE: 3840
[Parsed_overlay_0 @ 00000000003ce0e0] Incoming frame (time:0.12) from link #1
dshow passing through packet of type video size 4147200 timestamp 983178040000 orig timestamp 983178041790 graph timestamp 983178040000 diff -1790 Video (00-2 Pro Capture Quad HDMI)
[Parsed_overlay_0 @ 00000000003ce0e0] n:3.000000 t:0.066667 pos:0.000000 x:0.000000 xi:0 y:0.000000 yi:0
av_interleaved_write_frame(): Unknown error
No more output streams to write to, finishing.
dshow passing through packet of type video size 4147200 timestamp 983178240000 orig timestamp 983178241592 graph timestamp 983178240000 diff -1592 Video (00-2 Pro Capture Quad HDMI)
[dshow @ 00000000003527a0] real-time buffer [Video (00-2 Pro Capture Quad HDMI)] [video input] too full or near too full (136% of size: 3041280 [rtbufsize parameter])! frame dropped!
[Parsed_overlay_0 @ 00000000003ce0e0] Incoming frame (time:0.1) from link #0
[Parsed_overlay_0 @ 00000000003ce0e0] n:3.000000 t:0.100000 pos:0.000000 x:0.000000 xi:0 y:0.000000 yi:0
Error writing trailer of ​http://192.168.2.5:8090/Mini3.ffm: Error number -10053 occurredframe= 3 fps=0.0 q=2.0 Lsize= 41kB time=00:00:00.00 bitrate=30353454.5kbits/s speed=8.15e-005x
video:37kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.967591%
Input file #0 (c:\temp\black_frame_x_red.png):

Input stream #0:0 (video): 11 packets read (648725 bytes); 4 frames decoded;
Total: 11 packets (648725 bytes) demuxed

Input file #1 (video=Video (00-2 Pro Capture Quad HDMI):audio=Audio (2- 00-2 Pro Capture Quad):

Input stream #1:0 (video): 4 packets read (16588800 bytes); 4 frames decoded;
Input stream #1:1 (audio): 0 packets read (0 bytes);
Total: 4 packets (16588800 bytes) demuxed

Output file #0 (​http://192.168.2.5:8090/Mini3.ffm):

Output stream #0:0 (video): 3 frames encoded; 2 packets muxed (37953 bytes);
Total: 2 packets (37953 bytes) muxed

dshow passing through packet of type video size 4147200 timestamp 983178440000 orig timestamp 983178441471 graph timestamp 983178440000 diff -1471 Video (00-2 Pro Capture Quad HDMI)
[dshow @ 00000000003527a0] real-time buffer [Video (00-2 Pro Capture Quad HDMI)] [video input] too full or near too full (136% of size: 3041280 [rtbufsize parameter])! frame dropped!
8 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0000000002a8a020] Statistics: 0 seeks, 2 writeouts
[AVIOContext @ 0000000000353000] Statistics: 5012875 bytes read, 84 seeks
dshow passing through packet of type audio size 37044 timestamp 983176330000 orig timestamp 983176330000 graph timestamp 983178560000 diff 2230000 Audio (2- 00-2 Pro Capture Quad
dshow passing through packet of type video size 4147200 timestamp 983178640000 orig timestamp 983178560121 graph timestamp 983178640000 diff 79879 Video (00-2 Pro Capture Quad HDMI)
[dshow @ 00000000003527a0] real-time buffer [Video (00-2 Pro Capture Quad HDMI)] [video input] too full or near too full (136% of size: 3041280 [rtbufsize parameter])! frame dropped!
dshow passing through packet of type video size 0 timestamp 983178660000 orig timestamp 9774717811822 graph timestamp 983178660000 diff -8791539151822 Video (00-2 Pro Capture Quad HDMI)
[dshow @ 00000000003527a0] real-time buffer [Video (00-2 Pro Capture Quad HDMI)] [video input] too full or near too full (136% of size: 3041280 [rtbufsize parameter])! frame dropped!
Conversion failed!

[Rostislav Pehlivanov]

ffserver and the ffm muxer/demuxer has been dropped from git master