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• Latency in ffmpeg while live streaming

  22 janvier 2014, par mustafa.yavuz

  I am working on a project which has real time jobs. I should process a live stream with almost no latency. As you know when we play a live stream with ffplay there is some latency since it buffers some frames before playing it. Is there same problem with ffmpeg, that is when I connect a live stream and do some process like resampling and other calculations, does it have latency as ffplay has. How can I be sure there is no latency ?

• ffmpeg take long time for creating video from images [on hold]

  22 janvier 2014, par user3222005

  I am trying to create video from images.
  but it takes too much time if I select more than 10 images.
  Can anybody help me to resolve this problem.
  I am using the following command :

  ffmpeg -y -r 1/5 -i frame_%05d.jpg -c:v libx264 -r 30 video.mp4;

  Thanks in advance.

• How to convert any format to H264 (html5) video using ffmpeg ? [on hold]

  14 juillet 2013, par kheya

  I am trying to use a single command to convert avi, mov, wmv etc to H264 (HTML5 playback)
  I have command that converted the avi correctly to H264 (created .mp4 file)
  But the same command fails to convert a quicktime mov file.

  I am using the 64bit static built on windows.

  Here is the command I used to convert AVI to H264. This one works.

  for %%a in ("*.avi") do (
  
      ffmpeg -i "%%a" -c:v libx264 -preset slow -crf 20 -c:a libvo_aacenc -b:a 128k "%%~na.mp4"
  
  )

  I am trying this to convert mov to H264 :

  for %%a in ("*.mov") do (
  
      ffmpeg -i "%%a" -vcodec mpeg4 -acodec libvo_aacenc "%%~na.mp4" //fails
  
      ffmpeg -i "%%a" -vcodec libx264 -vprofile high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:480 -threads 0 -acodec libvo_aacenc -b:a 128k "%%~na.mp4" //fails with error )

  Appreciate if you kindly help me.

  EDIT :
  Here is the error :
  [graph 1 input from stream 0:1 @ 0000000002689260] Invalid sample format (null)
  Error opening filters !

  Output of the command :

  ffmpeg -i "file2.mov" -vcodec libx264 -vprofile high -preset slow -b:v 500k -ma
  
  xrate 500k -bufsize 1000k -vf scale=-1:480 -threads 0 -acodec libvo_aacenc -b:a
  
  128k "file2.mp4"
  
  
  
  The system cannot find the drive specified.
  
  ffmpeg version N-54691-g7f4a1fd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 12 2013 16:31:48 with gcc 4.7.3 (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-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 39.100 / 52. 39.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 80.101 /  3. 80.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file2.mov':
  
    Metadata:
  
      creation_time   : 1998-11-12 18:28:20
  
    Duration: 00:00:28.60, start: 0.000000, bitrate: 111 kb/s
  
      Stream #0:0(eng): Video: svq1 (SVQ1 / 0x31515653), yuv410p, 160x120, 90 kb/s
  
  , 7.52 fps, 7.50 tbr, 600 tbn, 600 tbc
  
      Metadata:
  
        creation_time   : 1998-11-12 18:28:20
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: qdmc (QDMC / 0x434D4451), 44100 Hz, mono
  
      Metadata:
  
        creation_time   : 1998-11-12 18:28:20
  
        handler_name    : Apple Alias Data Handler
  
  [graph 1 input from stream 0:1 @ 000000000251a080] Invalid sample format (null)
  
  Error opening filters!