Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

• How can I crop and encode a video using flutter natively, now that flutter_ffmpeg is discontinued with no alternatives ? [closed]

  13 mars, par Rageh Azzazy

  As of January 6, 2025, FFmpegKit is officially retired (Taner's article).

  This also affects the flutter_ffmpeg and ffmpeg_kit_flutter packages.

  Most packages for executing video editing commands were built depending on them and so won't work after April 1, 2025 as mentioned in the package documentation and Taner's article. Some packages that depend on flutter_ffmpeg or ffmpeg_kit_flutter are:

  • video_trimmer
  • zero_video_trimmer
  • flutter_video_trimmer
  • video_trim
  • bemeli_compress
  • video_trimmer_pro
  • ... others

  Editing video using video_editor or video_editor_2 or video_editor_pits has become a problem.

  I believe downloading the binaries and doing the whole thing locally is not just tedious but illegal as well.

  I broke down exactly what I need to edit videos in my flutter app and I found those package but have not yet tested them.

  • ✅ Trimming: flutter_native_video_trimmer

  • ✅ Compression: video_compress or video_compress_plus

  • ✅ Muting: video_compress handles this

  • ❌ Encoding: Not sure, I just need a simple MP4 video files

  • ❌ Cropping: I can't find a solution for video cropping

  I don't need to rotate, reverse or do any fancy stuff to the videos, just those five functions.

  Now the only way forward is to find a simple video cropping function and an encoder that work on flutter IOS & Android

  My question is not looking for external library recommendations but:

  Do you have any ideas how to crop a video in flutter natively?

• How can I use physical computer's GPU on VMware Workstation ?

  13 mars, par ching

  I want to use the GPU to accelerate video transcoding time by using FFmpeg on the virtual machine, VMware Workstation.

  When I use the command lspci | grep VGA, the output is

  00:0f.0 VGA compatible controller: VMware SVGA II Adapter
  

  It seems that I only can use its own Graphic Card on VMware, right?

  How can I use my host computer's GPU, NVIDIA Quadro K2000, from a program running in a guest VM?

  Or is there another solution that can solve the problem mentioned in the title?

• Convert video MP4 audio to MP3 using C#

  13 mars, par Tom Lee

  I have some videos in MP4 format and I'm trying to extract the audio from them.

  My code is:

  public static void Converter(string toConvert)
  {
      toConvert = VideoFile + ".mp4";
  
      var join = VideoFile.Split("-").ToList();
  
      VideoFile = string.Format("{0} - {1}", join[0], join[1]);
  
      var outputFile = VideoFile + ".mp3";
      var mp3Out = "";
  
      var ffmpegProcess = new Process
      {
          StartInfo =
          {
              UseShellExecute = false,
              RedirectStandardInput = true,
              RedirectStandardOutput = true,
              RedirectStandardError = true,
              CreateNoWindow = true,
              FileName = Directory,
              Arguments = " -i " + toConvert + " -vn -f mp3 -ab 320k output " + outputFile
          }
      };
  
      ffmpegProcess.Start();
      ffmpegProcess.StandardOutput.ReadToEnd();
      mp3Out = ffmpegProcess.StandardError.ReadToEnd();
      ffmpegProcess.WaitForExit();
  
      if (!ffmpegProcess.HasExited)
      {
          ffmpegProcess.Kill();
      }
      Console.WriteLine(mp3Out);
  }
  

  However, I get this error message:

  System.ComponentModel.Win32Exception: 'Access is denied'

  Any Ideas?

• Force FFmpeg to use a non-standard codec in container/extension (opus in .m4b)

  13 mars, par Craig Stevenson

  For my audiobooks I am using a non standard combination of using the opus audio codec in m4b files (this works without issue on most devices for me as they support opus audio streams in mp4 containers).

  currently having to instruct ffmpeg to encode it into mp4 and i manually change the extension to m4b, as it gives this error if i try and do it directly despite it being the same container format:

  [ipod @ 0x64872b2de9c0] Could not find tag for codec opus in stream #1, codec not currently supported in container
  

  Is there any comand or options to let me overide this and force it to let me use and opus stream directly in .m4b?

• Why does Apple support H.265 playback, but not when using HLS ? [closed]

  13 mars, par clark wu

  Apple devices (iPhone, iPad, macOS Safari) can natively play H.265 (HEVC) videos in .mp4 or .mov format. However, when I try to convert the same video to HLS, it fails to play. Here’s what I tested:

  Test Cases

  ✅ Directly playing H.265 .mp4 → Works fine

  ❌ H.265 + Opus → HLS (fMP4) → Fails

  ❌ H.265 + AAC → HLS (TS) → Fails

  ✅ H.264 + Opus → HLS fMP4 → Works fine (video + audio)

  ✅ H.264 + Opus → HLS TS → Video plays, but no audio

  ❌ H.265 + AAC → HLS fMP4 → Doesn’t play at all

  FFmpeg Commands Used

  1️⃣ H.265 + Opus (fMP4 segments)

  ffmpeg -i input.mp4 -c:v copy -c:a copy -hls_segment_type fmp4 -hls_time 10 -hls_list_size 0 -hls_flags independent_segments output.m3u8
  

  2️⃣ H.265 + AAC (TS segments)

  ffmpeg -i input.mp4 -c:v copy -c:a copy -hls_time 10 -hls_list_size 0 -hls_flags independent_segments output.m3u8
  

  Playback Attempts

  Vidstack.js player (Fails)

  Several online M3U8 players (All fail)

  Key Questions

  Why does Apple support H.265 in MP4 but not in HLS?

  Is this an HLS specification limitation?

  Does the audio codec (Opus / AAC) affect playback?

  Does HLS require a specific HEVC profile/level?

  Is HLS only compatible with AVC, not HEVC?

  Looking for Answers

  Has anyone successfully played H.265 + HLS on Apple devices?

  Are there any official Apple HLS specifications regarding HEVC support?

  Possible workarounds or alternative solutions?

  Would appreciate any insights or help from the community! Thanks!