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• How can I render a video in real time with custom parameters ?

  8 janvier 2015, par Joaquín L. Robles

  Is it possible to render a video in real time with custom parameters ? I’m trying to inject some parameters (text, image and other video portions) into a video template depending on user parameters, like the "Facebook 10 Years video"..

  The output format should be any video format such as H.264.

  I’ve been googling and asking and the closest I got is to make a video from HTML5 canvas captures, which I think is totally inefficient.

  Any insight or guidance would be great, thanks

• Fluent ffmpeg stream from buffer

  5 janvier 2020, par nonoom

  I have a function streamtogif() with ffmpeg that converts a stream to a gif and returns a buffer.
  It works perfectly fine, but here I am, I’m using busboy, and i get the entire file as buffer.
  Finally, I’d like to pass this one to the ffmpeg to turn for ex. a mp4 to a gif.
  Here is my code :
  streamtogif() :

  function streamtogif(stream, begintime = 0, duration){ //Return promise buffer
  
    return new Promise((resolve, reject)=>{
  
    buffer = [] //prepare creation of the buffer for the gif
  
      function addChunk(chunk){ 
  
        this.buffer.push(chunk)
  
      }
  
      function getBuffer(cb){ //get buffer array
  
        cb(this.buffer);
  
      }
  
      ffmpegstream = ffmpeg()
  
      .outputOptions('-metadata', 'title=test')
  
      .input(stream)
  
      .fps(20)
  
      .setStartTime(begintime)
  
      .noAudio()
  
      .videoCodec('gif')
  
      .format('gif')
  
  
  
      if(duration){ffmpegstream.duration(duration)} //only define duration if defined in function's parameters
  
      ffmpegstream.on('start',()=>{
  
        //console.log("starting")
  
        this.buffer = []
  
      })
  
      .on('end', ()=>{ 
  
        getBuffer((buff)=>{
  
        finalBuffer = Buffer.concat(buff);
  
        resolve(finalBuffer);
  
        });
  
    }) 
  
  
  
      var ffstream = ffmpegstream.pipe(); //handle data 
  
      ffstream.on('data', function(chunk) {
  
        addChunk(chunk);
  
      })
  
  
  
  
  
      ffmpegstream.run()
  
    });
  
  }

  The code using this function : //i dont put everything, but the essential

              finalBuffer = Buffer.concat(this.fileRead)
  
              const bufferStream = new Stream.PassThrough();
  
              bufferStream.end(finalBuffer);
  
              streamtogif(bufferStream).then((buffer)=>{
  
                upload = uploadpicture(buffer, "source/sportifeed").then((response)=>{ //success request
  
                  res.status(200).json({success: true, message: "Successfully uploaded !", url: response.data.link});
  
                },(err)=>{ //error
  
                  console.log(err)
  
                  res.status(500).json({success: false, message: "Error happenned while uploading !"});
  
                }).catch((err)=>{
  
                  console.log(err)
  
                  res.status(500).json({success: false, message: "Error happenned while uploading !"});
  
                });
  
              },(err)=>{
  
                console.log(err);
  
              })

  When i pass a stream coming from ytdl-core for example, everything works fine,
  but in this case, I get an error :

  An error occurred : ffmpeg exited with code 1 : pipe:0 : Invalid data
  found when processing input Error : ffmpeg exited with code 1 : pipe:0 :
  Invalid data found when processing input

  at ChildProcess.<anonymous> (C:\Users\famil\Desktop\sportifeed\node_modules\fluent-ffmpeg\lib\processor.js:182:22)
  
  at ChildProcess.emit (events.js:198:13)
  
  at Process.ChildProcess._handle.onexit (internal/child_process.js:248:12) ffmpeg version N-92722-gf22fcd4483
  
  </anonymous>

  Copyright (c) 2000-2018 the FFmpeg developers built with gcc 8.2.1
  (GCC) 20181201

  When i print the stream from streamtogif function, I get this https://pastebin.com/NHmySWdm
  It do not seems empty

  Thanks for your help

  Ps : I tried with bufferstream too and tried :https://gist.github.com/chris9753/86121a07c4aa27fcd654d16133799d30 I tried to pass the file from busboy ? Didn’t work, litterally didn’t raise error

• avformat/hlsenc : add a use_localtime option to expand the segment filename with localtime

  31 août 2015, par LiuQi

  avformat/hlsenc : add a use_localtime option to expand the segment filename with localtime
  test examples :
  ./ffmpeg -re -i /Movies/objectC/facebook.mp4 -v verbose -c copy -f hls -hls_segment_filename test-%s.ts -use_localtime 1 -bsf:v h264_mp4toannexb aaa.m3u8
  [StevenLiu@localhost ffmpeg]$ cat aaa.m3u8 ;ll test-*.ts
  
  test-1441052221.ts
  
  test-1441052231.ts
  
  test-1441052235.ts
  
  test-1441052243.ts
  
  test-1441052249.ts
  
   rw-r—r—  1 StevenLiu  staff  1310736  9  1 04:15 test-1441052131.ts
  
   rw-r—r—  1 StevenLiu  staff   495192  9  1 04:15 test-1441052141.ts
  
   rw-r—r—  1 StevenLiu  staff  1310736  9  1 04:17 test-1441052212.ts
  
   rw-r—r—  1 StevenLiu  staff  1067840  9  1 04:17 test-1441052221.ts
  
   rw-r—r—  1 StevenLiu  staff   235564  9  1 04:17 test-1441052231.ts
  
   rw-r—r—  1 StevenLiu  staff  1187220  9  1 04:17 test-1441052235.ts
  
   rw-r—r—  1 StevenLiu  staff   694848  9  1 04:17 test-1441052243.ts
  
   rw-r—r—  1 StevenLiu  staff   526588  9  1 04:17 test-1441052249.ts
  
  [StevenLiu@localhost ffmpeg]$
  ./ffmpeg -re -i /Movies/objectC/facebook.mp4 -v verbose -c copy -f hls -hls_segment_filename test-%s.ts -use_localtime 1 -bsf:v h264_mp4toannexb aaa.m3u8
  [StevenLiu@localhost ffmpeg]$ cat aaa.m3u8 ;ll aaa-*.ts
  
  aaa-1441052417.ts
  
  aaa-1441052427.ts
  
  aaa-1441052437.ts
  
  aaa-1441052440.ts
  
  aaa-1441052449.ts
  
   rw-r—r—  1 StevenLiu  staff  1310736  9  1 04:19 aaa-1441052382.ts
  
   rw-r—r—  1 StevenLiu  staff   277300  9  1 04:19 aaa-1441052392.ts
  
   rw-r—r—  1 StevenLiu  staff  1310736  9  1 04:20 aaa-1441052417.ts
  
   rw-r—r—  1 StevenLiu  staff  1067840  9  1 04:20 aaa-1441052427.ts
  
   rw-r—r—  1 StevenLiu  staff   235564  9  1 04:20 aaa-1441052437.ts
  
   rw-r—r—  1 StevenLiu  staff  1187220  9  1 04:20 aaa-1441052440.ts
  
   rw-r—r—  1 StevenLiu  staff   338776  9  1 04:20 aaa-1441052449.ts
  
  [StevenLiu@localhost ffmpeg]$
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/hlsenc.c