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• Mjpeg text based subtitle extraction/replay

  2 décembre 2013, par user3058117

  I have an MJPEG based avi file that I cannot replay satisfactorily.

  The video I can correctly replay in FFPlay but i cannot replay or demux the text based subtitle stream.

  The file contains time/date stamps in the subtitles embedded as ascii text which i can see between the video packets (when viewed in a hex reader).

  FFmpeg cannot identify the subtitle codec b7t can see that there is a subtitle stream.

  Ive tried a number of filter combinations using GraphStudioNext. I found a couple of working solutions (when previewed in GraphStudio when served to avisynth the subtitles had disappeared again. I checked the filtergraph and the pin out from the avi splitter had misteriously disconnected. I cannot find a way out of this.

  Does anyone have any suggestions on how i might demux the subtitle stream(short of writing a converter to extract the text to srt based on the packet timing) ?

  This is my first post so apologies if i havent observed etiquette.

• how to pass arguments to existing process instance in c#

  28 octobre 2013, par Akash Langhani

  I am using ffmpeg and I have start a process and I want to pass an argument to same instance after its start, so how to do this in c sharp any resource. Basically I am using ffmpeg to recored desktop screen and ffmpeg recording can be stop with "q" word.

• Video Spec to fluent-FFMPEG settings

  26 novembre 2020, par Dean Van Greunen

  Not sure how to translate this video spec into fluent-FFmpeg. please assist.

  


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  This is the only video I have that plays on my iPhone, and I would like to reuse the video's encoding to allow other videos I have, to be converted into the same video format. resulting in having my other videos playable via iPhone and iOS. (this also happens to play on android, I would like the recommended encoding settings to also work on android)

  


  


  


  The video should also be streamable, I know theres a flag called +faststart but not sure how to use it.

  


  


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  here is my existing code

  


  function convertWebmToMp4File(input, output) {
  return new Promise(
    function (resolve, reject) {
  ffmpeg(input)
    .outputOptions([
      // Which settings should I put here, each on their own line/entry <-- Important plz read
      '-c:v libx264',
      '-pix_fmt yuv420p',
      '-profile:v baseline',
      '-level 3.0',
      '-crf 22',
      '-preset veryslow',
      '-vf scale=1280:-2',
      '-c:a aac',
      '-strict experimental',
      '-movflags +faststart',
      '-threads 0',
    ])
    .on("end", function () {
      resolve(true);
    })
    .on("error", function (err) {
      reject(err);
    })
    .saveToFile(output);
  });
}


  


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  TIA