title: Could not find codec parameters for stream 0 (Video: hevc, none): unspecified size
body: <p>I try to use ffmpeg to feed ffserver on CENTOS 6.10. When I run ffmpeg on stream I got an error message: Could not find codec parameters for stream 0 (Video: h264, none): unspecified size.</p>
  
  <p>The full ffmpeg output is here:</p>
  
  <pre><code>[root@stone1 ~]# ffmpeg -i rtsp://user44:xxx@192.168.101.108:554/0 -y http://192.168.101.1:8090/feed2.ffm
  ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
    built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libdc1394 --enable-libfaac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
    libavutil      54. 20.100 / 54. 20.100
    libavcodec     56. 26.100 / 56. 26.100
    libavformat    56. 25.101 / 56. 25.101
    libavdevice    56.  4.100 / 56.  4.100
    libavfilter     5. 11.102 /  5. 11.102
    libavresample   2.  1.  0 /  2.  1.  0
    libswscale      3.  1.101 /  3.  1.101
    libswresample   1.  1.100 /  1.  1.100
    libpostproc    53.  3.100 / 53.  3.100
  [rtsp @ 0x8bc780] Could not find codec parameters for stream 0 (Video: hevc, none): unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  Guessed Channel Layout for  Input Stream #0.1 : mono
  Input #0, rtsp, from 'rtsp://user44:xxx@192.168.101.108:554/0':
    Metadata:
      title           : h264.mp4
    Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
      Stream #0:0: Video: hevc, none, 90k tbr, 90k tbn, 90k tbc
      Stream #0:1: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s
  [buffer @ 0x91c2e0] Unable to parse option value "0x0" as image size
  [buffer @ 0x91c2e0] Unable to parse option value "-1" as pixel format
  [buffer @ 0x91c2e0] Unable to parse option value "0x0" as image size
  [buffer @ 0x91c2e0] Error setting option video_size to value 0x0.
  [graph 0 input from stream 0:0 @ 0x8a0da0] Error applying options to the filter.
  Error opening filters!
  </code></pre>
  
  <p>I tested the stream with vlc on windows and it looks it works fine.
  <a href="https://i.stack.imgur.com/LOMdC.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LOMdC.jpg" alt="VLC stream details"></a></p>
  
  <p>Any hints on the issue?</p>
  
  <hr>
  
  <p>UPDATE</p>
  
  <p>I have confirmed that the same issue remains on Windows and Linux ffmpeg ver. 4.2.2. Please find attached debug output bellow.</p>
  
  <pre><code>D:\Temp\ffmpeg-4.2.2-win64-static\bin&gt;ffmpeg -loglevel debug -i rtsp://userxx:xxx@192.168.101.108:554/0:0 -y http://192.168.101.1:8090/feed2.ffm
  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
    built with gcc 9.2.1 (GCC) 20200122
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
    libavutil      56. 31.100 / 56. 31.100
    libavcodec     58. 54.100 / 58. 54.100
    libavformat    58. 29.100 / 58. 29.100
    libavdevice    58.  8.100 / 58.  8.100
    libavfilter     7. 57.100 /  7. 57.100
    libswscale      5.  5.100 /  5.  5.100
    libswresample   3.  5.100 /  3.  5.100
    libpostproc    55.  5.100 / 55.  5.100
  Splitting the commandline.
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  Reading option '-i' ... matched as input url with argument 'rtsp://userxx:xxx@192.168.101.108:554/0:0'.
  Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
  Reading option 'http://192.168.101.1:8090/feed2.ffm' ... matched as output url.
  Finished splitting the commandline.
  Parsing a group of options: global .
  Applying option loglevel (set logging level) with argument debug.
  Applying option y (overwrite output files) with argument 1.
  Successfully parsed a group of options.
  Parsing a group of options: input url rtsp://userxx:xxx@192.168.101.108:554/0:0.
  Successfully parsed a group of options.
  Opening an input file: rtsp://userxx:xxx@192.168.101.108:554/0:0.
  [tcp @ 000002426835b540] No default whitelist set
  [tcp @ 000002426835b540] Original list of addresses:
  [tcp @ 000002426835b540] Address 192.168.101.108 port 554
  [tcp @ 000002426835b540] Interleaved list of addresses:
  [tcp @ 000002426835b540] Address 192.168.101.108 port 554
  [tcp @ 000002426835b540] Starting connection attempt to 192.168.101.108 port 554
  [tcp @ 000002426835b540] Successfully connected to 192.168.101.108 port 554
  [rtsp @ 0000024268358c40] SDP:
  v=0
  o=StreamingServer 3331435948 1116907222000 IN IP4 192.168.101.108
  s=h264.mp4
  c=IN IP4 0.0.0.0
  t=0 0
  a=control:*
  m=video 0 RTP/AVP 96
  a=control:trackID=0
  a=rtpmap:96 H265/90000
  a=ptime:40
  a=range:npt=0-0
  a=fmtp:96 packetization-mode=1; sprop-parameter-sets=(null)
  a=videoinfo:960*576*30*4096
  m=audio 0 RTP/AVP 0
  a=control:trackID=1
  a=rtpmap:0 PCMU/8000
  a=ptime:20
  
  
  [rtsp @ 0000024268358c40] video codec set to: hevc
  [rtsp @ 0000024268358c40] audio codec set to: pcm_mulaw
  [rtsp @ 0000024268358c40] audio samplerate set to: 8000
  [rtsp @ 0000024268358c40] audio channels set to: 1
  [rtp @ 000002426835bb00] No default whitelist set
  [udp @ 000002426835f600] No default whitelist set
  [udp @ 000002426835f600] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  [udp @ 000002426835f600] end receive buffer size reported is 65536
  [udp @ 000002426836f900] No default whitelist set
  [udp @ 000002426836f900] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  [udp @ 000002426836f900] end receive buffer size reported is 65536
  [rtsp @ 0000024268358c40] setting jitter buffer size to 500
  [rtp @ 00000242683804c0] No default whitelist set
  [udp @ 0000024268380780] No default whitelist set
  [udp @ 0000024268380780] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  [udp @ 0000024268380780] end receive buffer size reported is 65536
  [udp @ 0000024268390a80] No default whitelist set
  [udp @ 0000024268390a80] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  [udp @ 0000024268390a80] end receive buffer size reported is 65536
  [rtsp @ 0000024268358c40] setting jitter buffer size to 500
  [rtsp @ 0000024268358c40] hello state=0
  [rtsp @ 0000024268358c40] Could not find codec parameters for stream 0 (Video: hevc, 1 reference frame, none): unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  Guessed Channel Layout for Input Stream #0.1 : mono
  Input #0, rtsp, from 'rtsp://userxx:xxx@192.168.101.108:554/0:0':
    Metadata:
      title           : h264.mp4
    Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
      Stream #0:0, 0, 1/90000: Video: hevc, 1 reference frame, none, 90k tbr, 90k tbn, 90k tbc
      Stream #0:1, 0, 1/8000: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
  Successfully opened the file.
  Parsing a group of options: output url http://192.168.101.1:8090/feed2.ffm.
  Successfully parsed a group of options.
  Opening an output file: http://192.168.101.1:8090/feed2.ffm.
  [NULL @ 00000242683c85c0] Unable to find a suitable output format for 'http://192.168.101.1:8090/feed2.ffm'
  http://192.168.101.1:8090/feed2.ffm: Invalid argument
  </code></pre>
  
  <p>VLC works fine on the same Windows system.</p>
  
  <p>Any hints on this please?</p>