Recherche avancée

Sur d’autres sites (7492)

• FFMPEG - format not available ?

  26 octobre 2020, par Julien Greard

  I'm converting some code from FFMPEG 0.8 to FFMPEG 1.2. I have an error during the call to the method avcodec_open2() :

  


  Specified pixel format %s is invalid or not supported


  


  The format I use is : AV_PIX_FMT_RGB24. It should be enabled by default, right ?

  


  Below is my code :

  


  av_register_all();

codec = avcodec_find_encoder(AV_CODEC_ID_MPEG2VIDEO);

if(!codec)
{
    throw SystemException("codec not found");
}

codecContext = avcodec_alloc_context3(codec);

codecContext->bit_rate = 200000;
codecContext->time_base.den = 1;
codecContext->time_base.num = 90000;
codecContext->gop_size = 8;
codecContext->pix_fmt = AV_PIX_FMT_RGB24;

_codecContext->width = 320
_codecContext->height = 240

if(avcodec_open2(_codecContext, _codec, NULL) < 0)
{
    throw SystemException("Unable to open codec");
}


  


• Swift Process Fails to Properly Send Metadata Args to FFMPEG

  30 avril 2019, par Ryan Stone

  I’m writing a Swift Process that concatenates a series of audio files using FFMPEG and libfdk_aac. The concatenation works, but when I pass metadata information through the process I get a Unrecognized option 'metadata artist="ff"' ... Option not found error.

  When debugging, if I use a breakpoint and print using e print(args.joined(separator: " ")) I’m able to take the exact output and paste it in the console, FFMPEG runs and doesn’t throw an error.

  I’m assuming there’s an oddity with how Swift process works, but even there I’ve tested and I’m stumped. I created a ruby script that took the args and looped over them and printed them and there is nothing given to the script that is unexpected. (Output below)

  Swift Process

  private func export() {
  
          guard let ffmpegPath = Bundle.main.path(forResource: "ffmpeg", ofType: "") else { return }
  
  
  
  
  
          var task = Process()
  
          task.launchPath = ffmpegPath
  
  
  
          let args: [String] = [
  
              "-i",
  
              #"concat:"\#(fileContents)""#,
  
              title(),
  
              artist(),
  
              narrator(),
  
              "-c:a",
  
              "libfdk_aac",
  
              "-vn",
  
              #"\#(exportPath)\#(exportFilename)"#
  
          ].compactMap { $0 }
  
  
  
          task.arguments = args
  
  
  
          var pipe = Pipe()
  
          setStdErrPipe(pipe: &pipe, task: &task)
  
          setTerminationNotification(task: task)
  
  
  
          task.launch()
  
      }
  
  
  
      func title() -> String? {
  
          guard metadata.titleText != "" else {
  
              return nil
  
          }
  
          return #"-metadata title="\#(metadata.titleText)""#
  
      }
  
  
  
      func artist() -> String? {
  
          guard metadata.authorText != "" else { return nil }
  
          return #"-metadata artist="\#(metadata.authorText)""#
  
      }
  
  
  
      func narrator() -> String? {
  
          guard metadata.narratorText != "" else { return nil }
  
          return #"-metadata album_artist="\#(metadata.narratorText)""#
  
      }

  Arg tester Output

  -i
  
  concat:"/Users/sharkmaul/Downloads/Bringing Up BÈbÈ/Bringing Up BÈbÈ-Part01.mp3|/Users/sharkmaul/Downloads/Bringing Up BÈbÈ/Bringing Up BÈbÈ-Part02.mp3"
  
  -metadata title="title"
  
  -metadata artist="author"
  
  -metadata album_artist="narrator"
  
  -c:a
  
  libfdk_aac
  
  -vn
  
  /Users/sharkmaul/Desktop/068F4F43-89EE-47F6-838D-7AD3E02E7F8A.m4a

• Fluent-ffmpeg : Output with label 'screen0' doesnot exist in any diferent filter graph, or was already used elsewhere

  28 avril 2019, par mandaputtra

  I’m trying to take video frame by frame using fluent-ffmpeg, to create video masking and some kin of like experiment video editor. But when I do that by screenshots it says ffmpeg exited with code 1: Output with label 'screen0' does not exist in any defined filter graph, or was already used elsewhere.

  Here example array that I use for producing timestamps. ["0.019528","0.05226","0.102188","0.13635","0.152138","0.186013","0.236149" ...]

  // read json file that contains timestaps, array
  
  fs.readFile(`${config.videoProc}/timestamp/1.json`, 'utf8', async (err, data) => {
  
    if (err) throw new Error(err.message);
  
    const timestamp = JSON.parse(data);
  
    // screenshot happens here
  
    // loop till there is nothing on array...
  
    function takeFrame() {
  
      command.input(`${config.publicPath}/static/video/1.mp4`)
  
        .on('error', error => console.log(error.message))
  
        .on('end', () => {
  
          if (timestamp.length > 0) {
  
            // screenshot again ...
  
            takeFrame();
  
          } else {
  
            console.log('Process ended');
  
          }
  
        })
  
        .noAudio()
  
        .screenshots({
  
          timestamps: timestamp.splice(0, 100),
  
          filename: '%i.png',
  
          folder: '../video/img',
  
          size: '320x240',
  
        });
  
    }
  
    // call the function
  
    takeFrame();
  
  });

  My expected result are, I can genereta all the 600 screenshot. on one video. but the actual result is this error ffmpeg exited with code 1: Output with label 'screen0' does not exist in any defined filter graph, or was already used elsewhere and only 100 screen generated.

  [UPDATE]

  using -filter_complex as mentioned in here doenst work.

  ffmpeg exited with code 1: Error initializing complex filters.
  
  Invalid argument

  [UPDATE]

  command line arg :

  ffmpeg -ss 0.019528 -i D:\Latihan\video-cms-core\public/static/video/1.mp4 -y -filter_complex scale=w=320:h=240[size0];[size0]split=1[screen0] -an -vframes 1 -map [screen0] ..\video\img\1.png