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• Understanding ffmpeg map option

  7 avril 2021, par Austin Kyker

  I came across the following command in a blog post which creates different quality video streams that are packaged into DASH format via the dash muxer.

  


  ffmpeg -i $VIDEO_IN \
    -preset $PRESET_P -keyint_min $GOP_SIZE -g $GOP_SIZE -sc_threshold 0 \
    -r $FPS -c:v libx264 -pix_fmt yuv420p -c:a aac -b:a 128k -ac 1 -ar 44100 \
    -map v:0 -s:0 $V_SIZE_1 -b:v:0 2M -maxrate:0 2.14M -bufsize:0 3.5M \
    -map v:0 -s:1 $V_SIZE_2 -b:v:1 145k -maxrate:1 155k -bufsize:1 220k \
    -map v:0 -s:2 $V_SIZE_3 -b:v:2 365k -maxrate:2 390k -bufsize:2 640k \
    -map v:0 -s:3 $V_SIZE_4 -b:v:3 730k -maxrate:3 781k -bufsize:3 1278k \
    -map v:0 -s:4 $V_SIZE_4 -b:v:4 1.1M -maxrate:4 1.17M -bufsize:4 2M \
    -map v:0 -s:5 $V_SIZE_5 -b:v:5 3M -maxrate:5 3.21M -bufsize:5 5.5M \
    -map v:0 -s:6 $V_SIZE_5 -b:v:6 4.5M -maxrate:6 4.8M -bufsize:6 8M \
    -map v:0 -s:7 $V_SIZE_6 -b:v:7 6M -maxrate:7 6.42M -bufsize:7 11M \
    -map v:0 -s:8 $V_SIZE_6 -b:v:8 7.8M -maxrate:8 8.3M -bufsize:8 14M \
    -map 0:a \
    -init_seg_name init\$RepresentationID\$.\$ext\$ -media_seg_name chunk\$RepresentationID\$-\$Number%05d\$.\$ext\$ \
    -use_template 1 -use_timeline 1  \
    -seg_duration 4 -adaptation_sets "id=0,streams=v id=1,streams=a" \
    -f dash Dash/dash.mpd


  


  The thing I'm struggling to understand is how the maps work. I've read the Map docs but they don't seem to have a comparable example.

  


  

  1. Why is -map v:0 used for every video stream ?

  


  2. Why does the first map line operate on stream 0 (e.g. -b:v:0) and the next map line operates on stream 1 (e.g. -b:v:1), etc.

  


  


  Would really appreciate a breakdown.

  


• How do I playback .m4s files. And turn them into a binary stream for a Discord Bot

  30 octobre 2020, par Harvey

  I want to download the BBC radio 2 and stream it to a discord server. Each request is https://as-dash-uk-live.akamaized.net/pool_904/live/uk/bbc_radio_two/bbc_radio_two.isml/dash/bbc_radio_two-audio=320000-250636302.m4s However the Time stamp will change and they regularly delete content. I found a .dash file as well https://as-dash-uk-live.akamaized.net/pool_904/live/uk/bbc_radio_two/bbc_radio_two.isml/dash/bbc_radio_two-audio=320000.dash which is seems to request. However I can't find how to send it through a discord bot to a discord server. My code is

  


  const axios = require('axios')


module.exports = {
    play: async function (guild,message) {
        const serverQueue = {};
        const voiceChannel = message.member.voice.channel
        serverQueue.connection = await voiceChannel.join();
        plays(guild)
        
        async function plays(guild) {
            let data1 = new Date(1353439725);
            let data2 = new Date(Date.now()/1000);
            console.log(`https://as-dash-uk-live.akamaized.net/pool_904/live/uk/bbc_radio_two/bbc_radio_two.isml/dash/bbc_radio_two-audio=320000-${Math.floor((data2 - data1))-4000}.m4s`)
            const dispatcher = serverQueue.connection.play((await axios.get(`https://as-dash-uk-live.akamaized.net/pool_904/live/uk/bbc_radio_two/bbc_radio_two.isml/dash/bbc_radio_two-audio=320000-${Math.floor((data2 - data1))-4000}.m4s`)).data)
                .on('finish', () => {
                    console.log('Music ended!');
                    plays(guild);
                    return
                })
                .on('error', error => {
                    console.error(error);
                    plays(guild);
                    return
                });
            dispatcher.setVolumeLogarithmic(serverQueue.volume / 5);
        }
    }
}


  


  However no audio plays and the audio end event is always being called. Am I being really stupid or is there a way to do this.

  


• FFMPEG : how i enable -decryption_key instead of -cenc_decryption_key when i do my ffmpeg build ? [closed]

  18 juillet 2024, par nabil mouslim

  i have é different ffmpeg bins , the first one have this option :

  


  dash AVOptions:


  


  -allowed_extensions .D......... List of file extensions that dash is allowed to access (default "aac,m4a,m4s,m4v,mov,mp4,webm,ts")

  


  -cenc_decryption_key .D......... Media decryption key (hex)

  


  and the second one have this option ; dash AVOptions :

  


  dash AVOptions:


  


  -allowed_extensions .D......... List of file extensions that dash is allowed to access (default "aac,m4a,m4s,m4v,mov,mp4,webm,ts")

  


  -decryption_key .D......... Media decryption key (hex)

  


  -http_persistent .D......... Use persistent HTTP connections (default true)

  


  i try all version of ffmpeg but after my build i always have the first options

  


  how i do to have -decryption_ke and -http_persistent options when i build my ffmpeg ??