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• Is it possible to mimic the codec settings of a given media file with ffmpeg ?

  5 août 2014, par Konstantin

  I would like to concat two mkv video file, one 1 sec (32 frames), and one 20 min, but the shorter has different encoding. I don’t want to encode both, but the shorter, and I would like to take the codec settings from the longer stream, and then concat them with command similar to :

  ffmpeg -f concat -i list.txt -c copy output.mkv

  Where list.txt contains :

  file properly-encoded-shorter-stream.mkv
  
  file longer-stream.mkv

  Audio streams are not problematic, both are uncompressed PCM wav.
  Details of my media files (3.avi was produced with avisynth / wine / virtualdub, the other mkv files are taken from a media file)

  ffmpeg -i 3.avi -i 5.mkv 
  
  ffmpeg version 2.3.1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jul 31 2014 14:53:16 with gcc 4.9.1 (GCC)
  
    configuration: --prefix=/usr --disable-debug --disable-static --enable-avisynth --enable-avresample --enable-decoder=atrac3 --enable-decoder=atrac3p --enable-dxva2 --enable-fontconfig --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [matroska,webm @ 0x84e3100] Unknown entry 0x1A45DFA3
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, matroska,webm, from '3.avi':
  
    Metadata:
  
      encoder         : libebml-0.7.5 & libmatroska-0.7.7
  
      creation_time   : 2014-08-04 23:08:59
  
    Duration: 00:00:01.03, start: 0.000000, bitrate: 153515 kb/s
  
      Stream #0:0(eng): Video: rawvideo, bgr24, 528x400, SAR 1:1 DAR 33:25, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
  Guessed Channel Layout for  Input Stream #1.1 : stereo
  
  Input #1, matroska,webm, from '5.mkv':
  
    Metadata:
  
      encoder         : libebml-0.7.5 & libmatroska-0.7.7
  
      creation_time   : 2014-08-04 22:45:57
  
    Duration: 00:06:18.45, start: 0.000000, bitrate: 3219 kb/s
  
      Stream #1:0(eng): Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 528x400 [SAR 1:1 DAR 33:25], 29.97 fps, 29.97 tbr, 1k tbn, 29.98 tbc (default)
  
      Stream #1:1(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s (default)

• ffmpeg can't find output directory under cygwin

  22 octobre 2015, par ljwobker

  I’m using the windows build of ffmpeg (details below), and when I try to transcode a video with the output file NOT in the local directory, it complains with the error message :

  /dtop/out.mp4: No such file or directory

  My cygwin mounts are as follows - I have not found any other application which doesn’t follow the mounts/links correctly...

  [lwobker:/dtop/vertigo]$ mount
  
  C:/Documents and Settings/lwobker/Desktop on /dtop type ntfs (binary)
  
  C:/cygwin/bin on /usr/bin type ntfs (binary,auto)
  
  C:/cygwin/lib on /usr/lib type ntfs (binary,auto)
  
  C:/cygwin on / type ntfs (binary,auto)
  
  C: on /cygdrive/c type ntfs (binary,posix=0,user,noumount,auto)

  Here’s what I’ve managed to figure out so far, leading me to believe that for some reason FFMPEG does not like following mount points or links in cygwin. But I’ll be damned if I can figure out why...

  if I do this, it WORKS :
  ffmpeg -i ./input.mp4 ./out.mp4

  if I do this, it WORKS (permission and mount/link check) :
  touch /dtop/out.mp4

  however, if I give a file location that is not in the current working directory or a subdirectory of the current working directory, it pukes :

  [lwobker:/dtop/vertigo]$ ffmpeg -i 00001.MTS /dtop/out.mp4
  
  ffmpeg version N-64919-ga613257 Copyright (c) 2000-2014 the FFmpeg developers
  
  <snip>
  
  Input #0, mpegts, from '00001.MTS':
  
    Duration: 00:01:41.63, start: 1.033367, bitrate: 10221 kb/s
  
    Program 1
  
      Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p, 1440x1080 [SAR 4:3 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 256 kb/s
  
      Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080
  
  /dtop/out.mp4: No such file or directory
  
  </snip>

  it also pukes if I give it /cygdrive/c/somefile.mp4 as an argument - it won’t find that either.

  Any ideas would be really appreciated. I had this working with a version of FFMPEG that I had compiled from source locally within cygwin, but when I moved machines I could not get it to recompile correctly so I’m hoping to figure this out so I can use the pre-compiled binaries for convenience...

  FFMPEG version details :

  [lwobker:/dtop/vertigo]$ ffmpeg
  
  ffmpeg version N-64919-ga613257 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jul 23 2014 00:35:22 with gcc 4.8.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-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      52. 92.101 / 52. 92.101
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.101 / 55. 48.101
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.102 /  4. 11.102
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
  
  
  
  Use -h to get full help or, even better, run 'man ffmpeg'

• Pipe a HTTP response

  30 juillet 2014, par viperfx

  How do I pipe an HTTP response like in NodeJS. Here is the snippet I am using in NodeJS :

  request({
  
    url: audio_file_url,
  
  }).pipe(ffmpeg_process.stdin);

  How can I achieve the same result in Go ?

  I am trying to pipe a audio stream from HTTP into an FFmpeg process so that it converts it on the fly and returns the converted file back to the client.

  Just so its clear to everyone here is my source code so far :

  func encodeAudio(w http.ResponseWriter, req *http.Request) {
  
      path, err := exec.LookPath("youtube-dl")
  
      if err != nil {
  
          log.Fatal("LookPath: ", err)
  
      }
  
      path_ff, err_ff := exec.LookPath("ffmpeg")
  
      if err != nil {
  
          log.Fatal("LookPath: ", err_ff)
  
      }
  
  
  
      streamLink := exec.Command(path,"-f", "140", "-g", "https://www.youtube.com/watch?v=VIDEOID")
  
  
  
      var out bytes.Buffer
  
      streamLink.Stdout = &out
  
      cmdFF := exec.Command(path_ff, "-i", "pipe:0", "-acodec", "libmp3lame", "-f", "mp3", "-")
  
      resp, err := http.Get(out.String())
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
      // pr, pw := io.Pipe()
  
      defer resp.Body.Close()
  
      cmdFF.Stdin = resp.Body
  
      cmdFF.Stdout = w
  
      streamLink.Run()
  
      //get ffmpeg running in another goroutine to receive data
  
      errCh := make(chan error, 1)
  
      go func() {
  
          errCh <- cmdFF.Run()
  
      }()
  
  
  
      // close the pipeline to signal the end of the stream
  
      // pw.Close()
  
      // pr.Close()
  
  
  
      // check for an error from ffmpeg
  
      if err := <-errCh; err != nil {
  
          // ff error
  
      }
  
  }

  Error : 2014/07/29 23:04:02 Get : unsupported protocol scheme ""