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• Normalizing with ffmpeg-normalize, slight variations in sound

  20 mai 2022, par Antti Rytsölä

  I have some flacs which I am trying to normalize for Spotify and Distrokid.

  


  I got the guide from this post

  


  ffmpeg-normalize inbound/*.flac -t -14 -lrt 11 -tp -1 -ext flac -c:a flac -of normalized/


  


  Now the problem is ( before submitting to Distrokid ) that when listening to normalized versions there seems to be light deviations, like muffling, to the sound at half a second lenghts.

  


  Small sample, towards the end.

  


  Now I'm asking for help because even though I can try different settings I still want to conform to Spotify normalization guide.

  


  The Spotify guide is as follows :

  


  Target the loudness level of your master at -14dB integrated LUFS 
and keep it below -1dB TP (True Peak) max. This is best for lossy 
formats (Ogg/Vorbis and AAC) and makes sure no extra distortion’s 
introduced in the transcoding process.

If your master’s louder than -14dB integrated LUFS, make sure 
it stays below -2dB TP (True Peak) to avoid extra distortion. This 
is because louder tracks are more susceptible to extra distortion 
in the transcoding process.


  


  and

  


   ffmpeg version N-102727-g580e168a94-tessus
 ffmpeg-normalize v1.22.8


  


  Tracks now on Spotify.

  


• How to stop a sound when certain other sound is inserted in the mix in ffmpeg ?

  3 avril 2022, par Antonio Oliveira

  I'm using a ffmpeg command that takes a set of sounds, mixes them into a single file, separating them by certain time intervals.

  


  Below is how my command is today.

  


  ffmpeg -i 
close_hh.wav    -i \
crash_l.wav     -i \
crash_r.wav     -i \
floor.wav       -i \
kick_l.wav      -i \
kick_r.wav      -i \
open_hh.wav     -i \
ride.wav        -i \
snare.wav       -i \
splash.wav      -i \
tom_1.wav       -i \
tom_2.wav       -i \
  tom_3.wav  -filter_complex  " [6]adelay=0|0[note_0];  [0]adelay=360|360[note_1];  [6]adelay=1260|1260[note_2];  [0]adelay=1537|1537[note_3];  [6]adelay=2494|2494[note_4];  [5]adelay=2767|2767[note_5];  [0]adelay=2969|2969[note_6];  [6]adelay=3673|3673[note_7];  [5]adelay=3924|3924[note_8];  [0]adelay=4132|4132[note_9];  [0][note_0][note_1][note_2][note_3][note_4][note_5][note_6][note_7][note_8][note_9]amix=inputs=11:normalize=0" record.wav


  


  This is the resulting audio that this command generates :

  


  ffmpg record.wav : https://drive.google.com/file/d/1LFV4ImLKLnRCqZRhZ7OqZy4Ecq5fwT3j/view?usp=sharing

  


  The purpose is to generate a drum recording, so I would like to simulate the dynamics of the hi-hat sounds : When the closed hi-hat is played, the open hi-hat will stop playing immediately if it is still sounding. The same behavior does not happen for any of the other sounds.

  


  One point that makes this a little more challenging is that other sounds can also be played between open hi-hat and closed hi-hat strikes, and theoretically the sound interruption behavior should work normally.

  


  Below is a recording demonstrating the expected result. (My app already reproduces the sound result I need internally, so I just made a simple recording with the microphone to illustrate)

  


  mic record.wav https://drive.google.com/file/d/19x19Fd_URQVo-MMCmGEHIC1SjaQbpWrh/view?usp=sharing

  


  Notice that in the first audio (ffmpeg record.wav) the first sound (open hi-hat) continues playing after the second is played.
In the second audio (mic record.wav) the first sound stops immediately after the second sound is played.

  


  How should the ffmpeg command be to get the expected result ?

  


• node js ffmpeg hls stream sound is repeating and overlays to each other

  1er avril 2022, par Marty

  I'm trying to stream video and audio with rtmp and I'm stack with problem that I hear sound which overlays to each other and always repeating. But my target is to not repeating and overlay audio to each other. Parsing hls performs with hls.js

  


  This is my ffmpeg config which creates 4 streaming files which includes in master file index.m3u8

  


  let argv = ['-y', '-i', inPath];
  Array.prototype.push.apply(argv, [
    '-filter_complex', '[0:v]split=4[v1][v2][v3][v4];[v1]copy[v1out];[v2]scale=w=1280:h=720[v2out];[v3]scale=w=800:h=480[v3out];[v4]scale=w=640:h=360[v4out]',
    '-map', '[v1out]', '-c:v:0', 'libx264', '-x264-params', 'nal-hrd=cbr:force-cfr=1', '-b:v:0', '5M', '-maxrate:v:0', '5M', '-bufsize:v:0', '5M', '-preset', 'veryfast', '-g', '48', '-sc_threshold', '0', '-keyint_min', '48',
    '-map', '[v2out]', '-c:v:1', 'libx264', '-x264-params', 'nal-hrd=cbr:force-cfr=1', '-b:v:1', '3M', '-maxrate:v:1', '3M', '-bufsize:v:1', '3M', '-preset', 'veryfast', '-g', '48', '-sc_threshold', '0', '-keyint_min', '48',
    '-map', '[v3out]', '-c:v:2', 'libx264', '-x264-params', 'nal-hrd=cbr:force-cfr=1', '-b:v:2', '1M', '-maxrate:v:2', '1M', '-bufsize:v:2', '1M', '-preset', 'veryfast', '-g', '48', '-sc_threshold', '0', '-keyint_min', '48',
    '-map', '[v4out]', '-c:v:3', 'libx264', '-x264-params', 'nal-hrd=cbr:force-cfr=1', '-b:v:3', '600k', '-maxrate:v:3', '600k', '-bufsize:v:3', '600k', '-preset', 'veryfast', '-g', '48', '-sc_threshold', '0', '-keyint_min', '48',
    '-map', 'a:0', '-c:a:0', 'aac', '-b:a:0', '96k', '-ac', '2',
    '-map', 'a:0', '-c:a:1', 'aac', '-b:a:1', '96k', '-ac', '2',
    '-map', 'a:0', '-c:a:2', 'aac', '-b:a:2', '96k', '-ac', '2',
    '-map', 'a:0', '-c:a:3', 'aac', '-b:a:3', '96k', '-ac', '2',
    '-f', 'hls', '-hls_time', '2', '-hls_flags', 'independent_segments', '-hls_list_size', '2', '-hls_segment_type', 'mpegts', '-hls_segment_filename', `${ouPath}/%v_data%02d.ts`, '-master_pl_name', `index.m3u8`,
    '-var_stream_map', 'v:0,a:0 v:1,a:1 v:2,a:2 v:3,a:3', `${ouPath}/stream_%v.m3u8`
  ]);
  this.ffmpeg_exec = spawn(this.conf.ffmpeg, argv)


  


  index.m3u8 :

  


  #EXTM3U
#EXT-X-VERSION:6
#EXT-X-STREAM- 
INF:BANDWIDTH=5605600,RESOLUTION=1920x1080,CODECS="avc1.64002a,mp4a.40.2"
stream_0.m3u8

#EXT-X-STREAM- 
INF:BANDWIDTH=3405600,RESOLUTION=1280x720,CODECS="avc1.640020,mp4a.40.2"
stream_1.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=1205600,RESOLUTION=800x480,CODECS="avc1.64001f,mp4a.40.2"
stream_2.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=765600,RESOLUTION=640x360,CODECS="avc1.64001f,mp4a.40.2"
stream_3.m3u8


  


  Below is streaming files from index.m3u8 with dynamic chunks

  


  stream_0.m3u8 :

  


  #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-INDEPENDENT-SEGMENTS
#EXTINF:2.400000,
0_data00.ts


  


  stream_1.m3u8 :

  


  #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:87
#EXT-X-INDEPENDENT-SEGMENTS
#EXTINF:1.600000,
1_data87.ts
#EXTINF:2.400000,
1_data88.ts


  


  stream_2.m3u8 :

  


  #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:110
#EXT-X-INDEPENDENT-SEGMENTS
#EXTINF:2.400000,
2_data110.ts
#EXTINF:1.600000,
2_data111.ts


  


  stream_3.m3u8 :

  


  #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:128
#EXT-X-INDEPENDENT-SEGMENTS
#EXTINF:2.400000,
3_data128.ts
#EXTINF:1.600000,
3_data129.ts