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• serialize/deserialize decoder context ?

  2 mars 2023, par jdizzle

  Is it possible to store and load decoder contexts to resume a decoding session across process launches ?

  


  Context/Goal : use video compression to send image data over an expensive link ; use intermediate frames almost exclusively (hours in between key frames). Allow consumer side to resume decoding in the event of interruption without requiring new key-frames from producer side.

  


• ffmpeg streaming to youtube becomes slow and starts buffering

  13 août 2022, par Syphax

  I'm using FFmpeg to broadcast to YouTube via rtmp.

  


  I'm using a cloud computing instance.

  


  Whether I put an HD video or low quality to broadcast, at the beginning it says that all is good and connection is Excellent, but after about 3 hours it becomes slow and starts to cut.

  


  I don't understand why this is happening, and if you know guys any tips to fix that.
Thanks...

  


• Opening an RTSP stream of Axis M1011-w camera gives 'Invalid data found when processing input' error (but not always)

  2 décembre 2014, par Edwin Meijne

  After some really frustrating hours I decided to see if someone can help me fix this annoying problem..

  For a project I am working on I want to record a RTSP stream in h.264 mp4 from an Axis (M1011-w) camera. I have tried this with openRTSP and ffmpeg, and got varying results. Because I need to record and simultaneously cut out small pieces of video from the total recording, I want to record in segments of around 2-3 seconds, so that I can simply use concat to quickly create shorter videos from the longer video recording.

  First I managed to do this by simply capturing the stream to raw H264 with openRTSP, and open the output file in ffmpeg while openRTSP was still writing in this file. But, this is not very reliable and not all camera’s work for this. Also, it requires me to open files of around 1-2 GB each time I want to cut a small section of 15 seconds, not very efficient nor fast.

  Now, I have a ffmpeg command that I used and which worked, but not always. It sometimes throws an error, sometimes it just works. If I try to capture 2 streams or more at the same time, it always fails.

  I am running the latest ffmpeg from the ffmpeg website (Mac OS X Yosemite) and tried an earlier version as well.. I have updated the camera firmware to the latest version and the router is running locally without a firewall. It has worked before, but is very unreliable..
  Maybe there is something simple I am not seeing ?

  The framerate of the camera is around 30, 640 x 480. The GOP is set to 20, so every 20 frames is an i-frame. The segments play perfectly fine without glitches and when concat-ting the output of a successful run plays fine...

  Playing video from the camera with VLC works fine as well, and openRTSP can also record from it without any hickups.

  Command :

  <pre>./ffmpeg -rtsp_transport tcp -fflags igndts -stimeout 100000 -t 3600 -i rtsp://root:fieldback@192.168.1.13/axis-media/media.amp?streamprofile=Quality -f segment -map 0:0 -c copy -segment_format mp4 -segment_time 2 -segment_time_delta 0.0166666666667 -reset_timestamps 1 -segment_list_entry_prefix 13/ -segment_list ./videos/18/200/cam_13.ffconcat ./videos/18/200/13/%09d.mp4 -loglevel debug</pre>

  Console output

  <pre>
  
  ffmpeg version 2.4.3-tessus Copyright (c) 2000-2014 the FFmpeg developers
  
   built on Nov  3 2014 23:01:10 with Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
  
   configuration: --cc=/usr/bin/clang --prefix=/Users/tessus/data/ext/ffmpeg/sw --as=yasm --extra-version=tessus --disable-shared --enable-static --disable-ffplay --enable-gpl --enable-pthreads --enable-postproc --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-libspeex --enable-bzlib --enable-zlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libxavs --enable-libsoxr --enable-libwavpack --enable-version3 --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvpx --enable-libgsm --enable-libopus --enable-libmodplug --enable-fontconfig --enable-libfreetype --enable-libass --enable-libbluray --enable-filters --disable-indev=qtkit --disable-indev=x11grab_xcb --enable-runtime-cpudetect
  
   libavutil      54.  7.100 / 54.  7.100
  
   libavcodec     56.  1.100 / 56.  1.100
  
   libavformat    56.  4.101 / 56.  4.101
  
   libavdevice    56.  0.100 / 56.  0.100
  
   libavfilter     5.  1.100 /  5.  1.100
  
   libswscale      3.  0.100 /  3.  0.100
  
   libswresample   1.  1.100 /  1.  1.100
  
   libpostproc    53.  0.100 / 53.  0.100
  
  Splitting the commandline.
  
  Reading option '-rtsp_transport' ... matched as AVOption 'rtsp_transport' with argument 'tcp'.
  
  Reading option '-fflags' ... matched as AVOption 'fflags' with argument 'igndts'.
  
  Reading option '-stimeout' ... matched as AVOption 'stimeout' with argument '100000'.
  
  Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '3600'.
  
  Reading option '-i' ... matched as input file with argument 'rtsp://root:fieldback@192.168.1.13/axis-media/media.amp?streamprofile=Quality'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'segment'.
  
  Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0:0'.
  
  Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'.
  
  Reading option '-segment_format' ... matched as AVOption 'segment_format' with argument 'mp4'.
  
  Reading option '-segment_time' ... matched as AVOption 'segment_time' with argument '2'.
  
  Reading option '-segment_time_delta' ... matched as AVOption 'segment_time_delta' with argument '0.0166666666667'.
  
  Reading option '-reset_timestamps' ... matched as AVOption 'reset_timestamps' with argument '1'.
  
  Reading option '-segment_list_entry_prefix' ... matched as AVOption 'segment_list_entry_prefix' with argument '13/'.
  
  Reading option '-segment_list' ... matched as AVOption 'segment_list' with argument './videos/18/200/cam_13.ffconcat'.
  
  Reading option './videos/18/200/13/%09d.mp4' ... matched as output file.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option loglevel (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file rtsp://root:fieldback@192.168.1.13/axis-media/media.amp?streamprofile=Quality.
  
  Applying option t (record or transcode "duration" seconds of audio/video) with argument 3600.
  
  Successfully parsed a group of options.
  
  Opening an input file: rtsp://root:fieldback@192.168.1.13/axis-media/media.amp?streamprofile=Quality.
  
  [rtsp @ 0x7fdaa480f000] SDP:
  
  v=0
  
  o=- 1288009478499165 1288009478499165 IN IP4 192.168.1.13
  
  s=Media Presentation
  
  e=NONE
  
  c=IN IP4 0.0.0.0
  
  b=AS:50000
  
  t=0 0
  
  a=control:rtsp://192.168.1.13:554/axis-media/media.amp?streamprofile=Quality
  
  a=range:npt=0.000000-
  
  m=video 0 RTP/AVP 96
  
  b=AS:50000
  
  a=framerate:30.0
  
  a=transform:1,0,0;0,1,0;0,0,1
  
  a=control:rtsp://192.168.1.13:554/axis-media/media.amp/trackID=1?streamprofile=Quality
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1; profile-level-id=420029; sprop-parameter-sets=Z0IAKeNQFAe2AtwEBAaQeJEV,aM48gA==
  
  
  
  [rtsp @ 0x7fdaa480f000] video codec set to: h264
  
  [rtsp @ 0x7fdaa480f000] RTP Packetization Mode: 1
  
  [rtsp @ 0x7fdaa480f000] RTP Profile IDC: 42 Profile IOP: 0 Level: 29
  
  [rtsp @ 0x7fdaa480f000] Extradata set to 0x7fdaa3d021e0 (size: 30)!
  
  rtsp://root:fieldback@192.168.1.13/axis-media/media.amp?streamprofile=Quality: Invalid data found when processing input
  
  </pre>