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• Converting DAV to MP4 and OGG

  27 mars 2015, par mackowiakp

  I want to prepare WEB page containing films from security camera recorders. Each recorder transmit video files in DAV format so each film is converted to MP4 format by script, using such syntax :

  ffmpeg -y -i movie.dav -vcodec libx264 -crf 24 movie.mp4

  So I included in HTMLv5 code such entry :

   <video width="320" height="240">
  
    <source src="movie.mp4" type="video/mp4">
  
  </source></video> 

  It works correctly with Chrome but not with Firefox. For proper work in FF it is necessary add link to OGG file. So correct HTMLv5 syntax for both browsers should look like this :

   <video width="320" height="240">
  
    <source src="movie.mp4" type="video/mp4">
  
    <source src="movie.ogg" type="video/ogg">
  
  </source></source></video>

  Can anybody help me to pass correct ffmpeg syntax to create OGG file ?

  Output from console after using -movflags +faststart options

  [maciek@piotr MMM]$ ../ffmpeg-2.4.2-64bit-static/ffmpeg -movflags +faststart -y -i   04.24.23-04.24.38\[M\]\[@0\]\[0\].dav -vcodec libx264 -crf 24 10.mp4
  
  ffmpeg version 2.4.2-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Oct  9 2014 07:24:56 with gcc 4.8 (Debian 4.8.3-11)
  
    configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable- libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    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
  
  Option movflags not found.

• ffmpeg how do I choose the correct Audio track ?

  28 février 2020, par Duk

  I’m converting a few .mkv files and need to choose the right Audio track, but dont know how.

  This is the command I use :

  ffmpeg -i "movie.mkv" -vcodec h264 -acodec aac -strict -2 output.mp4

  It is recommended by the webservice where I want to upload the video.

  Let’s say the Audiotracks look like this :

  mkvmerge -i "movie.mkv"
  
  
  
  Track ID 0: video (MPEG-4p10/AVC/h.264)
  
  Track ID 1: audio (AC-3)
  
  Track ID 2: audio (TrueHD)
  
  Track ID 3: subtitles (HDMV PGS)

  How do I select "Track 1" or "Track 2" for Output ?
  And which track will be selected, if I leave the Code like that ? (and why ?)

  Thanks for help !

• Overlay animated images with transparency over a static background image using ffmpeg ?

  17 février 2015, par Jona

  I’m looking to create a video using a set of png images that have transparency merged with a static background.

  After doing a lot of digging I seems like it’s definitely possible by using the filters library.

  My initial video making without including the background is :

  ffmpeg -y -qscale 1 -r 1 -b 9600 -loop -i bg.png -i frame_%d.png -s hd720 testvid.mp4

  Using -vf I can apply the background as overlay :

  ffmpeg -y -qscale 1 -r 1 -b 9600 -i frame_%d.png -vf "movie=bg.png [wm];[in][wm] overlay=0:0 [out]" -s hd720 testvid.mp4

  However the problem is it’s overlaying the background over the input. According libacfilter I can split the input and play with it’s content. I’m wondering if I can somehow change the overlay order ?

  Any help greatly appreciated !

  UPDATE 1 :
  I’m trying to make the following filter work but I’m getting the movie without the background :

  ffmpeg -y -qscale 1 -r 1 -b 9600 -i frame_%d.png -vf "movie=bg.png [bg]; [in] split [T1], fifo, [bg] overlay=0:0, [T2] overlay=0:0 [out]; [T1] fifo [T2]" -s hd720 testvid.mp4

  UPDATE 2 :
  Got video making using -vf option. Just piped the input slit it applied image over it and overlayed the two split feeds ! Probably not the most efficient way... but it worked !

  ffmpeg -y -r 1 -b 9600 -i frame_%d.png -vf "movie=bg.png, scale=1280:720:0:0 [bg]; [in] format=rgb32, split [T1], fifo, [bg] overlay=0:0, [T2] overlay=0:0 [out]; [T1] fifo [T2]" -s hd720 testvid.mp4