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• FFMPEG filter_complex with paletteuse and subtitles with force_style

  24 janvier 2019, par Adam Silva

  So I’m creating gifs from a video input, and to improve the quality I’m also using paletteuse among other options like scaling with this command

  /usr/bin/ffmpeg -ss 10 -t 3 -i /tmp/download.mp4 -i logo.png -filter_complex '[0:v] fps=12,scale=480:-1,overlay=x=(main_w-overlay_w)-5:y=(main_h-overlay_h)-5, split [a][b];[a] palettegen [p];[b][p] paletteuse' /var/www/html/youtube.gif

  Now I want to add subtitles to this gif with some custom styles like this :

  subtitles=subs.srt:force_style='FontName=Impact,Shadow=0.5'

  This is what I tried when combining the two :

  /usr/bin/ffmpeg -ss 10 -t 3 -i /tmp/download.mp4 -i logo.png -filter_complex '[0:v] fps=12,scale=480:-1,overlay=x=(main_w-overlay_w)-5:y=(main_h-overlay_h)-5,subtitles=subs.srt:force_style="'FontName=Impact,Shadow=0.5'" split [a][b];[a] palettegen [p];[b][p] paletteuse' /var/www/html/create-gifs/youtube.gif

  However, it’s not recognizing the Shadow style. If I run the commands separately they work, but the quality of the gif goes down when adding the subtitles. How can I make this work ?

• Adding subtitles with FFMpegCore in C# is not working on Azure Function

  1er février 2024, par Skerdi Berberi

  I have deployed a C# azure function with ffmpeg.exe (using FFMpegCore nuget). The function adds audio and srt/ass subtitles to a video.
When I test locally this code works (running on azurite). But, when I deploy the azure function, the audio is added to the video but the subtitles don't show up.

  


  At the begining I thought it was an issue with the Fonts because I was using ASS File for subtitles but then I switched to SRT and still is not working.

  


  I've tried with both SRT and ASS but they both don't work using this code :

  


  await FFMpegArguments
 .FromFileInput(videoInputPath, true, options =>
 {
     options.WithCustomArgument("-stream_loop -1");
 })
 .AddFileInput(audioPath, true)
 .OutputToFile(videoOutputPath, true, (options) =>
 {
     options.WithDuration(thread.AudioData.TotalAudioDuration);

     options.WithVideoCodec(VideoCodec.LibX264);   // Re-encode video using x264 codec
     options.WithAudioCodec(AudioCodec.Aac);       // Re-encode audio to AAC
     options.WithSpeedPreset(Speed.VeryFast);
     options.UsingShortest(true);

     options.WithVideoFilters((videoOptions) =>
     {
         videoOptions.HardBurnSubtitle(SubtitleHardBurnOptions.Create(subtitlesFile));
     });
 }).ProcessAsynchronously();


  


  Here's the command it creates on Azure function :

  


  ffmpeg -stream_loop -1 -i "C:\local\Temp\videoTempPath.mp4" -i "C:\local\Temp\audioTempPath.mp3" -t 00:00:22.8160000 -c:v libx264 -c:a aac -preset veryfast -shortest -vf "subtitles='C\:\\local\\Temp\\subtitles.srt'" "C:\local\Temp\output.mp4" -y


  


• I have 22,1 GB of movie data totally that I want to put on several DVDs

  8 mars 2017, par P. Dee

  I have 22,1 GB of movie data totally that I want to put on several DVDs.

  I want ffmpeg to create one long 22.1 GB mp4 file from a lot of small files to then split them into as many 4.7 GB mp4-files as necessary(should fit on 5 DVDs), so the order is preserved.

  Which command do I need ?

  I started with ffmpeg -f concat -safe 0 -i mylist.txt -c copy -fs 5046586573 output1.mp4 with mylist.txt containing

  # this is a comment
  
  file '/path/to/file1'
  
  file '/path/to/file2'
  
  file '/path/to/file3'

  Then looking at the duration, to then continue with ffmpeg -ss duration -f concat -safe 0 -i mylist.txt -c copy -fs 5046586573 output2.mp4

  Which command does that at once ?