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• What video codecs work on Google Chromebook

  3 mars 2019, par MonkeyDLuffy

  I’m trying to put a show on my friends Google Chromebook but the mp4 files show up black when trying to watch them on said Chromebook, audio works fine. I found out that it is a video encoding problem but I cannot find a list of video formats that work on the Chromebook. I have ffmpeg and handbrake to try and test some things, but if someone could tell me a ffmpeg code that will convert the video files into a format that works on a Google Chromebook that would help a lot.

  What I’ve tried :

  ffmpeg -i "Game of Thrones S02E01 The North Remembers.mkv" codec mpeg "Game of Thrones S02E01 The North Remembers.mp4"

  Which gives error :

  [NULL @ 00000177196ea500] Unable to find a suitable output format for
  ’codec’ codec : Invalid argument

• Streaming video over named PIPE with limited "channel" bandwidth

  13 mars 2019, par fmagno

  I have a video container vid.mp4 that I want to play with ffplay through a named PIPE and be able to tweak the maximum bandwidth allowed by the "channel". Follows what I did :

  1. Create a named PIPE :

  mkfifo pipe_in

  2. Send the container to the pipe with a limited bandwidth (150kB/s) with the help of pipe viewer pv :

  cat vid.mp4 | pv -L 150k > pipe_in

  3. Play the video with ffplay :

  ffplay cache:./pipe_in

  My expectation : To watch the video come through immediately but slowly given the bandwidth constraint.

  What really happens : The video begins to show at normal speed only when command 2. finishes running.

  Thank you in advance !

• Streaming ffmpeg output directly to dispatcher

  4 novembre 2020, par PP_Hyperion

  I'm trying to play music with my discord bot and I want to use ffmpeg to specify the start of the music, which works perfectly fine, but I can only download the music with ffmpeg and then play it. I want ffmpeg to process it and then also stream it to play the music.

  



  Here is the code I use to download and then play the music :

  



  message.member.voiceChannel.join().then((con, err) => {
    ytPlay.search_video(op, (id) => {
        let stream = ytdl("https://www.youtube.com/watch?v=" + id, {
            filter: "audioonly"
        });
        let audio = fs.createWriteStream('opStream.divx');

        proc = new ffmpeg({
            source: stream
        })
        proc.withAudioCodec('libmp3lame')
            .toFormat('mp3')
            .seekInput(35)
            .output(audio)
            .run();
        proc.on('end', function() {
            let input = fs.createReadStream('opStream.divx');
            console.log('finished');
            guild.queue.push(id);
            guild.isPlaying = true;
            guild.dispatcher = con.playStream(input);
        });
    });
})


  



  Is it possible to do what I want and if yes how ?