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• Error and understanding issue : using ffmpeg to real time publish FLV file to Red5 and real time download FLV from Red5

  29 août 2014, par kajarigd

  OS : Windows 8, RTMP Server : Red5, Video File format : FLV, I want to : Read/Write FLV from and to Red5 by live streaming.

  To publish FLV file from local I am using this command at Command Line :

  ffmpeg -re -i input.flv -acodec copy -vcodec copy -f flv rtmp://ocalhost/oflaDemo/streams

  My understanding : This command will upload input.flv to the server location C :\Program Files\red5\webapps\oflaDemo\streams. So, after the command is done running, I expect in this server location a new file input.flv will be created. Is this correct ?

  When I am running this command I am getting the following error and no file is getting created on the server side :

  [flv @ 03c6a660] Failed to update header with correct duration.
  
  [flv @ 03c6a660] Failed to update header with correct filesize.
  
  frame= 1567 fps= 24 q=-1.0 Lsize=    3064kB time=00:01:05.43 bitrate= 383.6kbits
  
  /s
  
  video:2232kB audio:767kB subtitle:0kB other streams:0kB global headers:0kB muxin
  
  g overhead: 2.183349%

  Can you help me understand what I am doing wrong ? What should be correct command in this case to achieve what I want ?

  Now, I am using the following command to livestream read a FLV file from the server into my local :

  ffmpeg -re -i rtmp://localhost/oflaDemo/streams/hobbit_vp6.flv -c copy dump.flv

  My understanding : File hobbit_vp6.flv will be downloaded into my local directory and will get saved as dump.flv. And this will be live streaming. This will be like, recording a video stream from the server. Is this correct ?

  When I am running this command I am getting the following error and no file is getting created on the local :

  Closing connection: NetStream.Play.StreamNotFound rtmp://localhost/oflaDemo/streams/hobbit_vp6.flv: Unknown error occurred

  Can you help me understand what I am doing wrong ? What should be correct command in this case to achieve what I want ?

• List Directory of files to text file sorted by creation date but don't show creation creation date in file

  25 mars 2019, par Oli Shingfield

  I’ve been doing some research on this problem but I can’t get my head around it to suit my particular issue.

  I would like to create a text file of a list of files in a directory, sorted by date but I don’t want the date to be shown in the file.
  The code I have so far is :

  #create list of clips to merge
  
  save_path = 'downloads/'
  
  ignored = 'test.bat','mergeclips.bat','draw.bat'
  
  onlyfiles = [f for f in listdir('downloads/') if isfile(join('downloads/', f)) if f not in ignored]
  
  
  
  with open('downloads/clipstomerge.txt', 'w') as f:
  
      for item in onlyfiles:
  
          f.write("file '%s'\n" % item )

  This code ignores the bat files but lists everything else out to a text file in a format ready for ffmpeg to merge the clips. The format of the text file looks like this :

  file 'ARandomClipName.mov'
  
  file 'Butterflies.mov'
  
  file 'Chickens.mov'

  At the moment the files are sorted alphabetically but I would like it to be sorted by creation date.
  Does anyone have any ideas how I could modify my code to fix my problem ?

• Programmatically capturing video with the FFmpeg libaries (not the libav fork) with variable frame rate in c++

  13 avril 2015, par Ben

  I am working on a simulator in c++ and OpenGL and I wanted to add some video capture capabilities (cross platform would be a requirement here). I decided to work with FFmpeg since I can directly put my rendered frames into a video. So far so good, but in a 3D rendering engine you are usually far from having a constant frame rate and I think that it is not a good idea to go constant there. Therefore I am trying to figure out how to capture a variable frame rate video with FFmpeg or how to get from my variable frame rate of the simulator to a constant frame rate for the video in FFmpeg. Can anybody help me out here ? How are videos usually captured in variable frame rate environments ?