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• FFMPEG : Controlling overlay through ZeroMQ in ffmpeg

  9 juillet 2020, par Michel

  For a project we need to manually control an overlay (static image) on top of a video stream. We concluded that we will need ZeroMQ to control this, and we've managed to control an audio filter successfully through ZeroMQ.

  


  To achieve this we've considered two options :

  


  

  1. Use a color filter to control the foreground (image) transparency

  


  2. "Move" the overlay image in front of the video stream, and remove it out of the video canvas

  


  


  We've managed to get both working, but not in combination with ZeroMQ, unfortunately.

  


  Example :

  


  ffmpeg -loglevel verbose    \
              -i $STREAM     \
              -i overlay.png  \
          -bsf:a aac_adtstoasc \
        -threads 12             \
             -vf "zmq=bind_address=tcp\\\://127.0.0.1\\\:1235, [0:v][1:v]overlay=25:25" \
            -c:a aac              \
             -af "azmq=bind_address=tcp\\\://127.0.0.1\\\:1235,volume=1" \
            -c:v h264 output


  


  The above example produces the following error :

  


  Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument


  


  Advice on how this can be achieved is highly appreciated !

  


• FFMPEG - Scrambled Output converting from VOB with ffmpeg

  24 décembre 2013, par MattD

  I've concatenated a series of VOB files from a DVD into a single VOB file and I am trying to convert it to MP4 or other similar format. I see a lot of errors when converting and the output appears scrambled.

  >ffmpeg.exe" -i file.vob -sameq file.mp4
  
  FFmpeg version git-N-29181-ga304071, Copyright (c) 2000-2011 the FFmpeg develope
  
  rs
  
    built on Apr 18 2011 21:24:03 with gcc 4.5.2
  
    configuration: --enable-gpl --enable-version3 --enable-runtime-cpudetect --ena
  
  ble-memalign-hack --enable-avisynth --enable-bzlib --enable-frei0r --enable-libo
  
  pencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --
  
  enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger
  
   --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enabl
  
  e-libx264 --enable-libxavs --enable-libxvid --enable-zlib --cross-prefix=i686-w6
  
  4-mingw32- --target-os=mingw32 --arch=x86_32 --extra-cflags=-I/home/kyle/softwar
  
  e/ffmpeg/external-libraries/win32/include --extra-ldflags=-L/home/kyle/software/
  
  ffmpeg/external-libraries/win32/lib --pkg-config=pkg-config
  
    libavutil    50. 40. 1 / 50. 40. 1
  
    libavcodec   52.120. 0 / 52.120. 0
  
    libavformat  52.108. 0 / 52.108. 0
  
    libavdevice  52.  4. 0 / 52.  4. 0
  
    libavfilter   1. 79. 0 /  1. 79. 0
  
    libswscale    0. 13. 0 /  0. 13. 0
  
  [mpeg2video @ 01751A90] ac-tex damaged at 5 16
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 1
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 2
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 3
  
  [mpeg2video @ 01751A90] invalid mb type in I Frame at 0 4
  
  
  
  [...]

  I'm guessing this is CSS scrambling and I need to do some sort of DeCSS. Does FFMpeg have an option for this ? Cringe if you'd like, but is there C# source to achieve this ?

  My end goal is really just to get some DVDs that I own onto my media server. I've tried a few demo-ware products with limited success including Acala DVD Ripper, Click to Disk, AVIDemux to name a few. I even paid for a couple of them to get the full version, but Acala only works for about half of my DVDs and Click to Disk can decode the VOB, but I need to use FFMpeg to convert. I'd like to have it all in one app that works and I am willing to write some code for it.

• FFmpeg -bash : ffmpeg : command not found

  12 février 2015, par Daniel Khajehpour

  OK, so I have gone up and down the internet trying to figure out what it is I am doing wrong ... and yet I’m in the middle of nowhere.
  I am basically trying to install the FFmpeg on my CENTOS 6.6 dedicated server by following the instructions here : https://trac.ffmpeg.org/wiki/CompilationGuide/Centos

  Everything seems to go just fine throughout the process. When it’s all done, I type in "ffmpeg" hit the enter and keep on getting this extremely ugly error :

  -bash : -bash: : command not found

  I’m not much of a shell guy, but working with it all day today, I can say that this means that it’s not installed correctly. So, I tried re-installing it, and it tells me all the packages already exist now ... . Here is a copy if what I am doing and what I am getting :

  root@server1 [~]# ffmpeg -version
  
  -bash: ffmpeg: command not found
  
  
  
  root@server1 [~]# yum install autoconf automake gcc gcc-c++ git libtool make nasm pkgconfig zlib-devel
  
  Loaded plugins: fastestmirror, priorities, security
  
  Setting up Install Process
  
  Loading mirror speeds from cached hostfile
  
   * base: centos.mirror.ndchost.com
  
   * extras: centos-distro.cavecreek.net
  
   * updates: mirrors.easynews.com
  
  Package autoconf-2.63-5.1.el6.noarch already installed and latest version
  
  Package automake-1.11.1-4.el6.noarch already installed and latest version
  
  Package gcc-4.4.7-11.el6.x86_64 already installed and latest version
  
  Package gcc-c++-4.4.7-11.el6.x86_64 already installed and latest version
  
  Package git-1.7.1-3.el6_4.1.x86_64 already installed and latest version
  
  Package libtool-2.2.6-15.5.el6.x86_64 already installed and latest version
  
  Package 1:make-3.81-20.el6.x86_64 already installed and latest version
  
  Package nasm-2.07-7.el6.x86_64 already installed and latest version
  
  Package 1:pkgconfig-0.23-9.1.el6.x86_64 already installed and latest version
  
  Package zlib-devel-1.2.3-29.el6.x86_64 already installed and latest version
  
  Nothing to do

  Any ideas or help is greatly appreciated !