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• avformat/segafilmenc : Avoid seek when writing header

  17 juillet 2020, par Andreas Rheinhardt

  avformat/segafilmenc : Avoid seek when writing header
  Up until now, the Sega FILM muxer would first write all the packet data,
  
  then shift the data (in the muxer's write_trailer function) by the amount
  
  necessary to write the header at the front (which entails a seek to the
  
  front), then seek back to the beginning and actually write the header.
  This commit changes this : The dynamic buffer that is used to write the
  
  sample table (containing information about each sample in the file) is
  
  now used to write the complete header. This is possible because the size
  
  of everything in the header except the sample table is known in advance.
  
  Said buffer can then be used as one of the two temporary buffers used
  
  for shifting which also reduces the amount one has to allocate for this.
  
  Thereby the header will be written when shifting, so that the second
  
  seek to the beginning is unnecessary.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/segafilmenc.c

• electron app fluent-ffmpeg " Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height"

  27 juillet 2020, par Martin

  I am trying to run an ffmpeg command in my electron app. I have created the function ffmpegTest() based off instructions for setting up ffmpeg here :

  


  https://alexandercleasby.dev/blog/use-ffmpeg-electron

  


  and the example query for ffmpeg-fluent here :

  


  https://github.com/fluent-ffmpeg/node-fluent-ffmpeg/blob/master/examples/image2video.js

  


  function ffmpegTest(){
    console.log('ffmpeg-test')
    //require the ffmpeg package so we can use ffmpeg using JS
    const ffmpeg = require('fluent-ffmpeg');
    //Get the paths to the packaged versions of the binaries we want to use
    const ffmpegPath = require('ffmpeg-static').replace(
        'app.asar',
        'app.asar.unpacked'
    );
    const ffprobePath = require('ffprobe-static').path.replace(
        'app.asar',
        'app.asar.unpacked'
    );
    //tell the ffmpeg package where it can find the needed binaries.
    ffmpeg.setFfmpegPath(ffmpegPath);
    ffmpeg.setFfprobePath(ffprobePath);
    
    var imgPath = "C:\\Users\\marti\\Documents\\martinradio\\uploads\\israel song festival 1979\\front.jpg"
    var outputPath = "C:\\Users\\marti\\Documents\\martinradio\\uploads\\israel song festival 1979\\output.m4v"

    // make sure you set the correct path to your video file
    var proc = ffmpeg(imgPath)
    // loop for 5 seconds
    .loop(5)
    // using 25 fps
    .fps(25)
    // setup event handlers
    .on('end', function() {
    console.log('file has been converted succesfully');
    })
    .on('error', function(err) {
    console.log('an error happened: ' + err.message);
    })
    // save to file
    .save(outputPath);

    console.log("end of ffmpeg-test")
}


  


  it is trying to convert an image to a video, my filepaths are accurate, but when I run this function, I get this output in console :

  


  ffmpeg-test
index.js:137 end of ffmpeg-test
index.js:132 an error happened: ffmpeg exited with code 1: Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!


  


  After the error prints out, I can see my output.m4v file inside my output folder, but it is 0KB in size and wont open. Is there some way I can specify my bit_rate / rate / width / height in my fluent-ffmpeg command so I can run this simple ffmpeg command ?

  


  thanks

  


• lavf/srt : fix build fail when used the libsrt 1.4.1

  12 juillet 2020, par Jun Zhao

  lavf/srt : fix build fail when used the libsrt 1.4.1
  libsrt changed the :
  
  SRTO_SMOOTHER   -> SRTO_CONGESTION
  
  SRTO_STRICTENC  -> SRTO_ENFORCEDENCRYPTION
  
  and removed the front of deprecated options (SRTO_SMOOTHER/SRTO_STRICTENC)
  
  in the header, it's lead to build fail
  fix #8760
  Signed-off-by : Jun Zhao <barryjzhao@tencent.com>
  

  • [DH] libavformat/libsrt.c