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• C# / FFMPEG - Is this the best way to programmatically combine multiple video files in different formats and encodings into one ?

  28 avril 2021, par buggybud

  I've been trying to concat multiple videos into one. These videos may have different file types and extensions. As it stands I am only working with MP4 files that seem to have different resolutions, framerates, you name it.

  


  After having first followed the Stackoverflow answers that talked about using an intermediate file (convert all the files into one format, then concate that) I also came across a solution that uses what I think is called a 'concat video filter.'

  


  This would allow me to ignore the intermediate steps and just combine all the files by specifying their individual settings within one single FFMPEG command.

  


                  -i 1.mp4 -i 2.mp4 -i 3.mp4 -filter_complex \
                "[0:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v0];
                 [1:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v1];
                 [2:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v2];
                 [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][a]" \
                -map "[v]" -map "[a]" -c:v libx264 -c:a aac -movflags +faststart output.mp4


  


  Provided above is the snippet that shows you how to combine three videos into one. I've used this Snippet within my code but as opposed to manually specifying the input files, and not finding a way to use the list file, I came across the very hacky solution to programatically create the above command parameters.

  


              var command = "";

            for (var i = 0; i < video_paths.Count; i++)
            {
                command += $"-i \"{video_paths[i]}\" ";
            }

            command += "-filter_complex ";
            command += "\"";

            for (var i = 0; i < video_paths.Count; i++)
            {
                command += $"[{i}:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1,setsar=1,fps=30,format=yuv420p[v{i}];";
            }

            for (var i = 0; i < video_paths.Count; i++)
            {
                command += $"[v{i}][{i}:a]";
            }

            command += $"concat=n={video_paths.Count}:v=1:a=1[v][a]\" ";
            command += $"-map \"[v]\" -map \"[a]\" -c:v libx264 -c:a aac -movflags +faststart \"{path}\"";

            ffmpeg(command);


  


  The above code is the solution to my problem. It works.

  


  The reason I made this Stackoverflow question is the following : Is this the best way to programatically make the arguments ? What is the maximum string limit of these arguments as my video paths are all absolute paths ? How can I make this look nicer and less chaotic in code ?

  


  Bud

  


• FFmpeg apply multiple filters (Logo overlay, Brightness change and text overlay)

  4 octobre 2018, par A.Butakidis

  I am trying to add three filters to a png file using ffmpeg in Android (I am using the writing mind lib).

  So far I managed to pull together the cmd :

  -i /storage/emulated/0/videoApp/temp/firstFrameOfMergedVideo.png 
  
  
  
  -i /storage/emulated/0/videoApp/temp/logo.png
  
  
  
  -filter_complex

  FIRST FILTER

  [1:v]scale=h=-1:w=100[overlay_scaled],[0:v][overlay_scaled]overlay=eval=init:x=W-100-W*0.1:y=W*0.1, 

  SECOND FILTER

  drawtext=fontfile=/system/fonts/Roboto-Regular.ttf:text='xbsg':fontcolor=white:fontsize=60:box=1:boxcolor=0x7FFFD4@0.5:boxborderw=20:x=20:y=h-(text_h*2)-(h*0.1):enable='between(t,0,2)',

  THIRD FILTER

  drawtext=fontfile=/system/fonts/Roboto-Regular.ttf:text='cbeh':fontcolor=white:fontsize=30:box=1:boxcolor=0x7FFFD4@0.5:boxborderw=20:x=20:y=h-text_h-(h*0.1)+25:enable='between(t,0,2)',

  FOURTH FILTER

  eq=contrast=1:brightness=0.26180276:saturation=1:gamma=1:gamma_r=1:gamma_g=1:gamma_b=1:gamma_weight=1 
  
  -c:a
  
  copy
  
  /storage/emulated/0/videoApp/temp/frameWithFilters.png

  Right now I am trying to separate the filters using , but I also tried ;

  It throws me back :

  Input #0, png_pipe, from '/storage/emulated/0/videoApp/temp/firstFrameOfMergedVideo.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: png, rgb24(pc), 1080x1920, 25 tbr, 25 tbn, 25 tbc
  
  
  
  Input #1, png_pipe, from '/storage/emulated/0/videoApp/temp/logo.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Video: png, rgba(pc), 528x582, 25 tbr, 25 tbn, 25 tbc
  
  
  
  [NULL @ 0xf265d800] Unable to find a suitable output format for ','
  
  ,: Invalid argument

  If I apply them individual they work.

  I am new to ffmpeg so any help would be appreciated.

• Error trying to stream multiple files - Invalid data found when processing input

  14 avril 2020, par xybrek

  ffmpeg -re -stream_loop -1 -i mylist.txt -f mpegts -vcodec copy -acodec copy http://localhost:8081/yoursecret

  



  mylist.txt file contains :

  



  file 'out001.ts'
file 'out002.ts'


  



  up to out327.ts

  



  Here's the output of the above command :

  



  ffmpeg version git-2020-04-03-52523b6 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200328
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 42.102 / 56. 42.102
  libavcodec     58. 77.101 / 58. 77.101
  libavformat    58. 42.100 / 58. 42.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 77.101 /  7. 77.101
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
mylist.txt: Invalid data found when processing input


  



  However streaming individual files works :

  



  ffmpeg -re -stream_loop -1 -i out001.ts -f mpegts -vcodec copy -acodec copy http://localhost:8081/yoursecret


  



  I've also tried but also does not work :

  



  ffmpeg -re -stream_loop -1 -i <(for %%i in (*.ts) do @echo file '%%i') -f mpegts -vcodec copy -acodec copy http://localhost:8081/yoursecret