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• Streaming audio with FFMPEG and NDK [closed]

  12 décembre 2011, par enfix

  I need to do a streaming audio by MMS protocol.
  I think FFMPEG is the only way.
  Any1 can help me how can i do this ?
  Any tutorial or other to use FFMPEG ?
  

• What is Video Lagrange factor and how to achieve Constant bit rate ?

  12 décembre 2011, par Tarun

  I want to perform transcoding using FFMPEG. My target is to acheive CBR i.e Constant bit rate. But even using option like -maxrate and -minrate I am unable to acheive it. I know when converting to x264 if I choose CBR, it will deteriorate the video quality but I am OK with it since I want to use it for streaming.

  Please help me asap

• how to synchronize video with audio through pts in ffmpeg

  10 décembre 2011, par Michael Chen

  I play a h264 format video with ffmpeg, and I try to synchronize video with audio by pts. the video format information:

   Metadata:
      major_brand     : isom
      minor_version   : 512
      compatible_brands: mp41
      creation_time   : 1970-01-01 00:00:00
    Duration: 00:00:11.72, start: 0.000000, bitrate: 300 kb/s
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 512x384, 250 kb/s, 25 fps, 25 tbr, 25025 tbn, 50 tbc
      Metadata:
        creation_time   : 1970-01-01 00:00:00
        handler_name    : VideoHandler
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 44 kb/s
      Metadata:
        creation_time   : 1970-01-01 00:00:00
        handler_name    : SoundHandler
  

  but the first frame's pts is 0 and the second frame' pts is 1001, base_time * pts = 11s! why? there are long time between the 1st frame with the 2nd frame!

• FFMPEG makes my server crash

  10 décembre 2011, par user997735

  I have a youtube mp3 converter site, and to do this I am using FFMPEG.

  The problem is that the FFMPEG is using 100% CPU when there are some converting process together, so users can't access my site until the processes are finished.

  How can I limit the CPU usage of FFMPEG? Is there another solution to solve my problem?

• Windows FFMPEG - convert a PNG to WMV of n seconds duration

  10 décembre 2011, par user608886

  Been bumping my head into the walls for the last 2 days with FFMPEG Windows. Basically I have a PNG. I want to generate a WMV of exactly 400 seconds - all done from the command line.