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• create single video form 3 separate videos using FFmpeg

  24 septembre 2019, par Shijin

  I was trying to create single video form 3 separate videos using FFmpeg.

  ffmpeg -y -loglevel debug  -i /home/ubuntu/test/1569317318/15693173181124138568.webm   -i /home/ubuntu/test/1569317318/1569317318867082351.webm   -i /home/ubuntu/test/1569317318/1569317318191333163.webm  -filter_complex '[0]scale=320:-1[a];[1]scale=320:-1[b];[2]scale=320:-1[c];[3]scale=320:-1[d];[a]pad=640:480[x];[x][b]overlay=320[y];[y][c]overlay=0:240[z];[z][d]overlay=320:240;[0][1]amix'  -c:v libx264   -crf 23   -preset veryfast   -shortest   /home/ubuntu/test/1569317318/1569317318478598265.mp4

  This is not woking, It throws an error like bellow

  Invalid file index 3 in filtergraph description
  [0]scale=320 :-1[a] ;[1]scale=320 :-1[b] ;[2]scale=320 :-1[c] ;[3]scale=320 :-1[d] ;[a]pad=640:480[x] ;[x][b]overlay=320[y] ;[y][c]overlay=0:240[z] ;[z][d]overlay=320:240 ;[0][1]amix.

  How to fix it ? If we provide four inputs, It is working

• compiling ffmpeg from source on debian with dependencies also from source, gives shared library error

  17 mars 2017, par devprashant

  here is a snippet from script(permalink) that is created for compiling and installing ffmpeg from source with compiling its dependencies also from source :

  local_install="$HOME/.localpacks"
  
  mkdir $local_install 2> /dev/null
  
  
  
  
  
  if [[ $PATH != *"$local_install"* ]]; then
  
    echo "Setting PATH to point to" $local_install
  
    echo PATH=$HOME/.localpacks/bin:$HOME/.localpacks/share:$HOME/.localpacks/include:$HOME/.localpacks/lib:$PATH >> ~/.bashrc
  
   # ======see here when pointed below=============================
  
  else
  
    echo "PATH already configured"
  
  fi
  
  
  
  ...................
  
    part of script which download and compile dependencies
  
  ...................
  
  
  
  wget http://ffmpeg.org/releases/ffmpeg-3.2.4.tar.bz2 && \
  
  tar xf ffmpeg-3.2.4.tar.bz2 && \
  
  cd ffmpeg-3.2.4 && \
  
  ./configure   \
  
     --prefix="$local_install" \
  
     --pkg-config-flags="--static"  \
  
     --extra-cflags="-I$HOME/.localpacks/include" \
  
     --extra-ldflags="-L$HOME/.localpacks/lib" \
  
     --bindir="$HOME/.localpacks/bin" \
  
     --enable-gpl \
  
     --enable-libass \ 
  
     --enable-libfreetype  \
  
     --enable-libmp3lame  \
  
     --enable-libx264  \
  
     --enable-nonfree && \
  
  make -j4 && make install && \
  
  cd .. && \
  
  rm ffmpeg-3.2.4* -rf 
  
  
  
  source ~/.profile

  It install ffmpeg correctly. but when i run ffmpeg from terminal it gives :

  ffmpeg : error while loading shared libraries : libass.so.9 : cannot open
  shared object file : No such file or directory

  From upper code snippet , (where you can see now), PATH include $local_install/lib.

  On ls to /.localpacks/lib :

  abc@server:~/.localpacks/lib$ ls
  
  libass.a libass.so.9 libass.la libass.so.9.0.0 libass.so libavcodec.a 

  So, libass.so.9 is in library path.

  To run it correctly , need to run like below :

  $ LD_LIBRARY_PATH=$HOME/.localpacks/lib/:$LD_LIBRARY_PATH
  
  $ LD_LIBRARY_PATH=$local_install/lib ffmpeg

  So, why i need to include it again in LD_LIBRARY_PATH to run ffmpeg.

  Here is the permalink to the script : install_ffmpeg_from_source.sh

• Trying to convert an RTSP stream to a HSL file, but get a "Failed to Open Segment" error

  1er juin 2021, par Alvydas Juodikis

  These are the linux commands I ran on ubuntu 20.04 to convert an rtsp stream to a HLS file. I was trying to then display it onto my html webserver to run a live video but I'm stuck at an error.

  


  ffmpeg -fflags nobuffer \&#xA; -rtsp_transport tcp \&#xA; -i <my rtsp="rtsp" url="url"> \&#xA; -vsync 0 \&#xA; -copyts \&#xA; -vcodec copy \&#xA; -movflags frag_keyframe&#x2B;empty_moov \&#xA; -an \&#xA; -hls_flags delete_segments&#x2B;append_list \&#xA; -f segment \&#xA; -segment_list_flags live \&#xA; -segment_time 0.5 \&#xA; -segment_list_size 1 \&#xA; -segment_format mpegts \&#xA; -segment_list Home/Desktop/fmpegsolution/index.m3u8 \&#xA; -segment_list_type m3u8 \&#xA; -segment_list_entry_prefix Home/Desktop/fmpegsolution/ \&#xA; Home/Desktop/fmpegsolution/%3d.ts&#xA;</my>

  


  I'm using an example from this link :
https://girishjoshi.io/post/ffmpeg-rtsp-to-hls/

  


  I try to generate my file into a directory located in my desktop called fmpegsolution (hence the output path Home/Desktop/fmpegsolution)

  


  The error :

  


  When running this on terminal, the error comes out to :
[segment @ 0x558c82e11ec0] Opening 'Home/Desktop/fmpegsolution/000.ts' for writing [segment @ 0x558c82e11ec0] Failed to open segment 'Home/Desktop/fmpegsolution/000.ts' Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory

  


  My issue is related to the folder or directory but it definitely exists. I even tried creating a "%3d.ts" blank file (000.ts) but that had no effect. Could use some help. Thanks for your time.