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• ffmpeg : Using tee with segmenter

  17 juillet 2024, par Lev

  I'm trying to use a tee to output my stream into 1min segments and into a file at the same time. Here's my command :

  



  ffmpeg -i "rtsp://${cameraIp}:554/axis-media/media.amp?videocodec=h264&resolution=1280x720&fps=15" -c copy -map 0 \
-f tee "[f=ssegment:segment_time=60:segment_format=mp4:reset_timestamps=1:r=15] ${rootPath}/${storeId}-${location}-%03d.mp4 \
| /tmp/${cameraIp}.mkv"


  



  Individually (without tee) both outputs work fine. So I can either output into segmented files or into a non-segmented file. But with the tee I get this error :

  



  


  [stream_segment,ssegment @ 0x217ece0] Failed to open segment '
 /etc/cida/diagnostics/vid/780801-99-000.mp4' [tee @ 0x217d820] Slave
 '[f=ssegment:segment_time=60:segment_format=mp4:reset_timestamps=1:r=15]
 /etc/cida/diagnostics/vid/780801-99-%03d.mp4' : error writing header :
 No such file or directory

  


  



  See full command output below. Any suggestions ?

  



  


  ffmpeg version 3.3 Copyright (c) 2000-2017 the FFmpeg developers
  
 built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1 14.04.3) configuration :
 —extra-libs=-ldl —prefix=/opt/ffmpeg —mandir=/usr/share/man —enable-avresample —disable-debug —enable-nonfree —enable-gpl —enable-version3 —enable-libopencore-amrnb —enable-libopencore-amrwb —disable-decoder=amrnb —disable-decoder=amrwb —enable-libpulse —enable-libfreetype —enable-gnutls —enable-libx264 —enable-libx265 —enable-libfdk-aac —enable-libvorbis —enable-libmp3lame —enable-libopus —enable-libvpx —enable-libspeex —enable-libass —enable-avisynth —enable-libsoxr —enable-libxvid —enable-libvidstab —enable-libwavpack —enable-nvenc libavutil 55. 58.100 / 55. 58.100 libavcodec 57. 89.100 / 57. 89.100 libavformat 57. 71.100 / 57. 71.100 libavdevice 57. 6.100 / 57. 6.100 libavfilter 6. 82.100 / 6. 82.100 libavresample 3. 5. 0 / 
 3. 5. 0 libswscale 4. 6.100 / 4. 6.100 libswresample 2. 7.100 / 2. 7.100 libpostproc 54. 5.100 / 54. 5.100 Input #0, rtsp, from 'rtsp ://10.83.245.7:554/axis-media/media.amp ?videocodec=h264&resolution=1280x720&fps=15' :
 Metadata :
 title : Session streamed with GStreamer
 comment : rtsp-server Duration : N/A, start : 0.080011, bitrate : N/A
 Stream #0:0 : Video : h264 (Main), yuvj420p(pc, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 25 tbr, 90k tbn, 180k tbc
 [stream_segment,ssegment @ 0x217ece0] Failed to open segment '
 /etc/cida/diagnostics/vid/780801-99-000.mp4' [tee @ 0x217d820] Slave
 '[f=ssegment:segment_time=60:segment_format=mp4:reset_timestamps=1:r=15]
 /etc/cida/diagnostics/vid/780801-99-%03d.mp4' : error writing header :
 No such file or directory [tee @ 0x217d820] Slave muxer #0 failed,
 aborting. Could not write header for output file #0 (incorrect codec
 parameters ?) : No such file or directory Stream mapping : Stream #0:0
 -> #0:0 (copy)
 Last message repeated 1 times

  


  


• ffmpeg : Using tee with segmenter

  30 avril 2017, par Lev

  I’m trying to use a tee to output my stream into 1min segments and into a file at the same time. Here’s my command :

  ffmpeg -i "rtsp://${cameraIp}:554/axis-media/media.amp?videocodec=h264&resolution=1280x720&fps=15" -c copy -map 0 \
  
  -f tee "[f=ssegment:segment_time=60:segment_format=mp4:reset_timestamps=1:r=15] ${rootPath}/${storeId}-${location}-%03d.mp4 \
  
  | /tmp/${cameraIp}.mkv"

  Individually (without tee) both outputs work fine. So I can either output into segmented files or into a non-segmented file. But with the tee I get this error :

  [stream_segment,ssegment @ 0x217ece0] Failed to open segment ’
  /etc/cida/diagnostics/vid/780801-99-000.mp4’ [tee @ 0x217d820] Slave
  ’[f=ssegment:segment_time=60:segment_format=mp4:reset_timestamps=1:r=15]
  /etc/cida/diagnostics/vid/780801-99-%03d.mp4’ : error writing header :
  No such file or directory

  See full command output below. Any suggestions ?

  ffmpeg version 3.3 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1 14.04.3) configuration :
  —extra-libs=-ldl —prefix=/opt/ffmpeg —mandir=/usr/share/man —enable-avresample —disable-debug —enable-nonfree —enable-gpl —enable-version3 —enable-libopencore-amrnb —enable-libopencore-amrwb —disable-decoder=amrnb —disable-decoder=amrwb —enable-libpulse —enable-libfreetype —enable-gnutls —enable-libx264 —enable-libx265 —enable-libfdk-aac —enable-libvorbis —enable-libmp3lame —enable-libopus —enable-libvpx —enable-libspeex —enable-libass —enable-avisynth —enable-libsoxr —enable-libxvid —enable-libvidstab —enable-libwavpack —enable-nvenc libavutil 55. 58.100 / 55. 58.100 libavcodec 57. 89.100 / 57. 89.100 libavformat 57. 71.100 / 57. 71.100 libavdevice 57. 6.100 / 57. 6.100 libavfilter 6. 82.100 / 6. 82.100 libavresample 3. 5. 0 /
  3. 5. 0 libswscale 4. 6.100 / 4. 6.100 libswresample 2. 7.100 / 2. 7.100 libpostproc 54. 5.100 / 54. 5.100 Input #0, rtsp, from ’rtsp ://10.83.245.7:554/axis-media/media.amp ?videocodec=h264&resolution=1280x720&fps=15’ :
  Metadata :
  title : Session streamed with GStreamer
  comment : rtsp-server Duration : N/A, start : 0.080011, bitrate : N/A
  Stream #0:0 : Video : h264 (Main), yuvj420p(pc, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 25 tbr, 90k tbn, 180k tbc
  [stream_segment,ssegment @ 0x217ece0] Failed to open segment ’
  /etc/cida/diagnostics/vid/780801-99-000.mp4’ [tee @ 0x217d820] Slave
  ’[f=ssegment:segment_time=60:segment_format=mp4:reset_timestamps=1:r=15]
  /etc/cida/diagnostics/vid/780801-99-%03d.mp4’ : error writing header :
  No such file or directory [tee @ 0x217d820] Slave muxer #0 failed,
  aborting. Could not write header for output file #0 (incorrect codec
  parameters ?) : No such file or directory Stream mapping : Stream #0:0
  -> #0:0 (copy)
  Last message repeated 1 times

• Saving scatterplot animations with matplotlib produces blank video file

  1er avril 2013, par user2175850

  I am having a very similar problem to this question

  but the suggested solution doesn't work for me.

  I have set up an animated scatter plot using the matplotlib animation module. This works fine when it is displaying live. I would like to save it to an avi file or something similar. The code I have written to do this does not error out but the video it produces just shows a blank set of axes or a black screen. I've done several checks and the data is being run and figure updated it's just not getting saved to video...

  I tried removing "animated=True" and "blit=True" as suggested in this question but that did not fix the problem.

  I have placed the relevant code below but can provide more if necessary. Could anyone suggest what I should do to get this working ?

  def initAnimation(self):
  
          rs, cfgs = next(self.jumpingDataStreamIterator)     
  
          #self.scat = self.axAnimation.scatter(rs[0], rs[1], c=cfgs[0], marker='o')
  
          self.scat = self.axAnimation.scatter(rs[0], rs[1], c=cfgs[0], marker='o', animated=True)
  
          return self.scat,
  
  
  
  
  
  def updateAnimation(self, i):
  
      """Update the scatter plot."""
  
      rs, cfgs = next(self.jumpingDataStreamIterator)
  
      # Set x and y data...
  
      self.scat.set_offsets(rs[:2,].transpose()) 
  
      #self.scat = self.axAnimation.scatter(rs[0], rs[1], c=cfgs[0], animated=True)
  
      # Set sizes...
  
      #self.scat._sizes = 300 * abs(data[2])**1.5 + 100
  
      # Set colors..
  
      #self.scat.set_array(cfgs[0])
  
      # We need to return the updated artist for FuncAnimation to draw..
  
      # Note that it expects a sequence of artists, thus the trailing comma.
  
      matplotlib.pyplot.draw()
  
      return self.scat,
  
  
  
  def animate2d(self, steps=None, showEvery=50, size = 25):
  
      self.figAnimation, self.axAnimation = matplotlib.pyplot.subplots()
  
      self.axAnimation.set_aspect("equal")
  
      self.axAnimation.axis([-size, size, -size, size])
  
      self.jumpingDataStreamIterator = self.jumpingDataStream(showEvery)
  
  
  
      self.univeseAnimation = matplotlib.animation.FuncAnimation(self.figAnimation, 
  
                              self.updateAnimation, init_func=self.initAnimation,
  
                              blit=True)
  
      matplotlib.pyplot.show()
  
  
  
  def animate2dVideo(self,fileName=None, steps=10000, showEvery=50, size=25):
  
      self.figAnimation, self.axAnimation = matplotlib.pyplot.subplots()
  
      self.axAnimation.set_aspect("equal")
  
      self.axAnimation.axis([-size, size, -size, size])
  
      self.Writer = matplotlib.animation.writers['ffmpeg']
  
      self.writer = self.Writer(fps=1, metadata=dict(artist='Universe Simulation'))
  
      self.jumpingDataStreamIterator = self.jumpingDataStream(showEvery)
  
  
  
      self.universeAnimation = matplotlib.animation.FuncAnimation(self.figAnimation, 
  
                              self.updateAnimation, scipy.arange(1, 25), init_func=self.initAnimation)
  
  
  
      self.universeAnimation.save('C:/universeAnimation.mp4', writer = self.writer)