Recherche avancée

Sur d’autres sites (8857)

• avformat/rtsp : Fix timeout option

  30 mai 2021, par Andriy Gelman

  avformat/rtsp : Fix timeout option
  92c40ef882be115e72d2aa02f9032b7ce88f8537 added a listen_timeout option
  
  for sdp. This allowed a user to set variable timeout which was
  
  originally hard coded to 10 seconds.
  The commit used the initial_timeout variable to store the value. But
  
  this variable is shared with rtsp where it's used to infer a "listen"
  
  mode. Thus, the timeout value could not be set in rtsp, and the default
  
  value (initial_timeout = -1) would give 100ms timeout.
  This was attempted to be fixed in c8101aabee654f6d147a4d89f77fa73e18908610,
  
  which changed the meaning of initial_timeout = -1 to be an infinite
  
  timeout. However, it did not address the issue that the timeout could
  
  still not be set. Being able to set the timeout is useful because it
  
  allows to automatically reconfigure from a udp to tcp connection in the
  
  lower transport.
  In this commit this is fixed by using the stimeout variable to
  
  store the timeout value.
  Signed-off-by : Andriy Gelman <andriy.gelman@gmail.com>
  

  • [DH] libavformat/rtsp.c
  • [DH] libavformat/rtsp.h

• ffmpeg : add enc_time_base option

  3 mai 2017, par erankor

  ffmpeg : add enc_time_base option
  add a per-stream option for setting the encoder timebase.
  
  the following values are allowed :
  
  0 - for video, use 1/frame_rate, for audio use 1/sample_rate (this is
  
    the default)
  
   1 - match the input timebase (when possible)
  
  >0 - set the timebase to provided number
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] doc/ffmpeg.texi
  • [DH] ffmpeg.c
  • [DH] ffmpeg.h
  • [DH] ffmpeg_opt.c

• Save MJPEG video stream to a raw file

  6 septembre 2014, par user824963

  I’ve a cheap IP cam, and i need to save the video stream inside a single file.

  i’ve tried to execute the wget command towards the stream’ url and the result was a file with this syntax :

  --object-ipcamera
  
  Content-Type:image/jpeg
  
  Content-Length:8012
  
  
  
  ÿØÿà [JPEG IMAGE CHARACTERS]  ÿÙ
  
  --object-ipcamera
  
  Content-Type:image/jpeg
  
  Content-Length:8012
  
  
  
  ÿØÿàÆÿ [JPEG IMAGE CHARACTERS]  ÿÿÿÙ
  
  --object-ipcamera
  
  Content-Type:image/jpeg
  
  Content-Length:8036

  Since i need to store the video stream, is mp4 a proper format to do that ? What if mp4 file being truncated ?

  I tried with ffmpeg :

  ffmpeg -i http://<auth params="params" local="local" url="url">:99/vieostream.cgi out.mp4
  
  </auth>

  the output was

  [ingenient @ 0x1f51600] Could not find codec parameters for stream 0 (Video: mjpeg): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [ingenient @ 0x1f51600] Estimating duration from bitrate, this may be inaccurate
  
  http://aaa@192.168.0.104:99/vieostream.cgi: could not find codec parameters

  and even setting these parameter to the max allowed value there is still the some output.

  I want also say that if i open the video url using VLC GUI, the video stream immediately comes out, so there is a way to auto-detect the video parameters ?

  Note : my server has a small CPU