Recherche avancée

Sur d’autres sites (6462)

• Using ffmpeg to split wav file at tone

  7 juin 2017, par Victor

  I have a problem, and despite much searching, I am having a hard time finding a solution, and I can’t believe that I a the first person that needs to do this.

  I have a system that creates audio files of automated fire dispatches as wav files, and occasionally the file will record multiple calls separated by a multi-tone sequence. Here is a sample

  I have been searching for a way to have ffmpeg, or some other linux CLI tool, recognise the tones and then cut the file into a separate wav file named [unixtimestamp of original]+duration seconds.wav

  Does anyone have any ideas ?

  Thanks in advance
  Victor

• Video Processing via Bluetooth

  16 juillet 2012, par kerim yucel

  The application I am currently developing processes each frames using a native code and it should record the video as well. I tried SDK for this purpose but certain restrictions didn't allow me to do so, so I switched to NDK for a video recording code piece.

  Apparently, my algorithm seriously uses CPU, upto %70 percent in the worst case. Before I actually start working on a video recorder, I wanted to try the following approach.

  I will process the preview frames using an android phone and send it to another phone (which uses same application and same model) for recording. My questions are :

  1.Should I try WiFi instead of Bluetooth ? I am developing the application for API 8 so I don't have WiFi-Direct, therefore I should do some socket programming, which would possibly complicate things a bit for me since Bluetooth can easily be set up using SDK.

  2- Will I be available to record the frames as a video at the receiving end ? I will receive each frame with certain metadata embedded to it and should record them using the other phone. I doubt I will be able to do it using SDK, so NDK along with ffmpeg seems to be the best choice ? Any suggestions related to this question will be more than welcome.

  3-Here comes the best part. I am recording the video with the lowest resolution that,after compressed, takes no more than 14mb space for a 10 minute long video. I have to reach the raw frames to send it to other end, encode and compress it. Any ideas related to possible flooding of Bluetooth/Wi-Fi because of big-sized raw frames ?

  Any other approaches and answers will be much appreciated. Thanks.

• I using ffmpeg to live stream a hd video to rtmp server of facebook but when see it only show 360 quality

  29 octobre 2018, par jack ma

  This is my ffmpeg code :

  'ffmpeg -i "{}"  ' \
  
        '-vf "zoompan=z=\'min(max(zoom,pzoom)+0.0015,2)\':d=1:x=\'iw/2-(iw/zoom/2)\':y=\'ih/2-(ih/zoom/2)\'" ' \
  
        '-vcodec libx264 ' \
  
        '-preset veryfast ' \
  
        '-maxrate 2932k ' \
  
        '-bufsize 2500k ' \
  
        '-vf "format=yuv420p" ' \
  
        '-g 60 ' \
  
        '-acodec libmp3lame ' \
  
        '-b:a 198k ' \
  
        '-ar 44100 ' \
  
        '-s 1280x720 ' \
  
        '-f flv "{}"

  I have wasted 2 day for this problem. Thanks for reading !