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• ffmpeg silence detect not properly working

  6 septembre 2014, par Zahlii

  I am trying to use the following command with the latest ffmpeg build to remove silence from my .mp3 files:

  ffmpeg -i SILENCE.mp3 -af silencedetect=n=-50dB:d=1 -y -ab 192k  SILENCE_OUT.mp3
  

  However, the following output is produced:

  ffmpeg version N-66154-g1654ca7 Copyright (c) 2000-2014 the FFmpeg developers
    built on Sep  5 2014 22:10:38 with gcc 4.8.3 (GCC)
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
  modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
  b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
  r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
  able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
   --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
  libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
    libavutil      54.  7.100 / 54.  7.100
    libavcodec     56.  1.100 / 56.  1.100
    libavformat    56.  4.100 / 56.  4.100
    libavdevice    56.  0.100 / 56.  0.100
    libavfilter     5.  1.100 /  5.  1.100
    libswscale      3.  0.100 /  3.  0.100
    libswresample   1.  1.100 /  1.  1.100
    libpostproc    53.  0.100 / 53.  0.100
  Input #0, mp3, from 'SILENCE.mp3':
    Metadata:
      title           : Snowblind (Featuring Tasha Baxter)
      artist          : Au5
      album           : Snowblind (Featuring Tasha Baxter)
      genre           : Electronica
      performer       : Au5
      track           : 1/1
      date            : 2014
      album_artist    : Au5,Tasha Baxter
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      encoder         : Lavf55.42.100
    Duration: 00:05:50.80, start: 0.025057, bitrate: 192 kb/s
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
  Output #0, mp3, to 'SILENCE_OUT.mp3':
    Metadata:
      TIT2            : Snowblind (Featuring Tasha Baxter)
      TPE1            : Au5
      TALB            : Snowblind (Featuring Tasha Baxter)
      TCON            : Electronica
      TPE3            : Au5
      TRCK            : 1/1
      TDRL            : 2014
      TPE2            : Au5,Tasha Baxter
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      TSSE            : Lavf56.4.100
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p, 192 kb/s
      Metadata:
        encoder         : Lavc56.1.100 libmp3lame
  Stream mapping:
    Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
  Press [q] to stop, [?] for help
  [silencedetect @ 0000000004398f40] silence_start: -0.00628118
  [silencedetect @ 0000000004398f40] silence_end: 3.21413 | silence_duration: 3.22
  041
  [silencedetect @ 0000000004398f40] silence_start: 343.844
  [libmp3lame @ 00000000043b2940] Trying to remove 1152 samples, but the queue is
  empty
  size=    8223kB time=00:05:50.79 bitrate= 192.0kbits/s
  video:0kB audio:8222kB subtitle:0kB other streams:0kB global headers:0kB muxing
  overhead: 0.011485%
  

  The generated audio file however still has the original length without any silence removed. See the following images: http://prntscr.com/4k52m5

  Any help is appreciated!

• How to let ffplay block the rtmps playback on unsafety certificate case

  5 septembre 2014, par Yehudi

  I use the ffplay to playback live stream thru rtmps protocol. And I see whether the streaming server uses the CA signed certificate or self-signed certificate, ffplay always accepts them and playback .

  How to configure ffplay or any compile option to set ffplay to reject the streaming from server that applies self-signed certificate ?

• How to specify a path for output file in ffmpeg ?

  5 septembre 2014, par Karthikeya Vaidya

  I am trying to give a path for output file, but ffmpeg is giving an error stating "Unable to find a suitable output format for '/kcs/eng/: Invalid argument. where as it is accepting the full path of input file.

  $in_path = "D:/kcs/kan/video.vob";
  $out_path = "E:/kcs/eng/video.mp4";
  
  ffmpeg -i $in_path -loglevel error -c:v libx264 -c:a aac -strict experimental $out_Path 
  

  Can any1 please help me out in this.. Thanks in advance...

• Streaming MP4 frames to HTML5, what am I doing wrong ?

  5 septembre 2014, par mczarnek

  Currently I am generating a MP4 Bitstream using Intel's Media SDK library, which uses ffmpeg underneath the covers. I can generate a mp4 file, and play it and it works.

  However, when I try to stream that mp4 across the network, it doesn't play within the HTML5 video player, as tested within Chrome, Firefox, or IE.

  This much is sent back and forth across the network:

  Sent by Chrome:
  GET / HTTP/1.1
  Host: localhost:8085
  Connection: keep-alive
  User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.102 Safari/537.36
  Accept-Encoding: identity;q=1, *;q=0
  Accept: */*
  Accept-Language: en-US,en;q=0.8
  Range: bytes=0-
  
  From my video player:
  HTTP/1.1 200 OK
  Server: Microsoft-HTTPAPI/2.0
  Date: Thu, 09 Jan 2014 17:28:14 GMT
  Content-type: video/mp4
  

  After this, I send a newline, and all the video frames, one after another, while listening to see if I receive anything back from the browser.

  Then nothing happens. Any suggestions to get this playing video? Thank you!

• Reduce the size of video for upload on server

  5 septembre 2014, par sdevani92

  after finding lost of stuff and blog i am finally found the FFmpeg4Android lib to convert the video size from here now my problem is the whenever i am try to convert the video instead of redusing the size it is increase the size the command which i am use is share below

   commandStr = "ffmpeg -y -i /sdcard/videokit/in.mp4 -strict experimental -s 320x240 -r 14 -aspect 3:4 -vcodec mpeg4 -b 2097152 -ab 48000 -ac 2 -ar 22050 /sdcard/videokit/in_.mp4";
  setCommand(commandStr);
  
                      setOutputFilePath("/sdcard/videokit/out.mp4");
                      setProgressDialogTitle("Exporting As MP4 Video");
                      setProgressDialogMessage("Depends on your video size, it can take a few minutes");
  runTranscoing();
  

  i am not getting any error the problem is only it increase the size of video. may be i am giving wrong command so any one can suggest me if i am going wrong.