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• FFMPEG : merge multiple audio files to one but audio parts should be on specific location

  20 octobre 2017, par Nihad

  I am trying to build one long audio file from multiple small audio files but these parts should start at a specific time.

  This is a command that I am using : (base audio is 135s long)
  ffmpeg -y -i base.mp3
  
   i first.wav
  
   i second.wav
  
   filter_complex
  "[1] adelay=90068|90068[a1] ;
  [2] adelay=130168|130168[a2] ;
  [0] [a1] [a2] amix=3" output.mp3

  The command is working as it should, output file is being created but the delay is not as specified. The first small file has delay of 87000 (3s earlier) and the second audio has delay of 126000 (4s earlier).

  This is the ffmpeg output :
  ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libdcadec —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-decklink —enable-zlib
  libavutil 55. 17.103 / 55. 17.103
  libavcodec 57. 24.102 / 57. 24.102
  libavformat 57. 25.100 / 57. 25.100
  libavdevice 57. 0.101 / 57. 0.101
  libavfilter 6. 31.100 / 6. 31.100
  libswscale 4. 0.100 / 4. 0.100
  libswresample 2. 0.101 / 2. 0.101
  libpostproc 54. 0.100 / 54. 0.100
  [mp3 @ 059b4400] Skipping 0 bytes of junk at 227.
  Input #0, mp3, from ’base.mp3’ :
  Metadata :
  encoder : Lavf57.25.100
  Duration : 00:02:21.04, start : 0.025057, bitrate : 31 kb/s
  Stream #0:0 : Audio : mp3, 44100 Hz, mono, s16p, 32 kb/s
  Guessed Channel Layout for Input Stream #1.0 : mono
  Input #1, wav, from ’first.wav’ :
  Duration : 00:00:14.88, bitrate : 352 kb/s
  Stream #1:0 : Audio : pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, s16, 352 kb/s
  Guessed Channel Layout for Input Stream #2.0 : mono
  Input #2, wav, from ’second.wav’ :
  Duration : 00:00:02.57, bitrate : 352 kb/s
  Stream #2:0 : Audio : pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, s16, 352 kb/s
  Output #0, mp3, to ’output.mp3’ :
  Metadata :
  TSSE : Lavf57.25.100
  Stream #0:0 : Audio : mp3 (libmp3lame), 22050 Hz, mono, fltp (default)
  Metadata :
  encoder : Lavc57.24.102 libmp3lame
  Stream mapping :
  Stream #0:0 (mp3) -> amix:input0
  Stream #1:0 (pcm_s16le) -> adelay
  Stream #2:0 (pcm_s16le) -> adelay
  amix -> Stream #0:0 (libmp3lame)
  Press [q] to stop, [?] for help
  size= 384kB time=00:01:38.11 bitrate= 32.0kbits/s speed= 196x
  
  [libmp3lame @ 059eef60] Trying to remove 576 samples, but the queue is empty
  size= 551kB time=00:02:21.03 bitrate= 32.0kbits/s speed= 191x
  
  video:0kB audio:551kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.040223%

  Is there a way to fix this problem, maybe with some additional parameter or something ?

  Thanks :)

• avcodec/jpeglsenc : Move check out of loop

  3 septembre 2020, par Andreas Rheinhardt

  avcodec/jpeglsenc : Move check out of loop
  ls_encode_line() encodes a line of input, going from left to right. In
  
  order to calculate a predicted value it uses the left and upper-left
  
  value of the output picture (that is, it uses how a decoder would see
  
  the already encoded part of the picture), unless this is the very first
  
  pixel of this line in which case one uses the first pixel of the last
  
  (upper) line and the line before the last line. Therefore the loop
  
  contained a check for whether this is the beginning of a new line. This
  
  commit moves said check out of the loop by initializing these values
  
  before the loop and by updating these values at the end of the loop
  
  body ; already read/calculated values are reused for this (the prediction
  
  also needs the value of the upper pixel and this can be reused for the
  
  upper left value of the next iteration of the loop).
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/jpeglsenc.c

• adjust volume just for 1 loop with ffmpeg

  6 juillet 2020, par alde

  What i've achieved so far is looping bgAudio and delay the mainAudio for 5 sec. But, there is issue when the bgAudio start to loop then its volume start again from 7.0, not from 0.9.

  


  ffmpeg version = 3.0.1

  


  "-i", mainAudio, "-filter_complex",
"amovie=bgAudio:loop=999,volume=enable='between(t,0,5):volume=7.0',volume=enable=" +
"'between(t,5.01,0):volume=0.9'[s] ;[0:0]adelay=5000|5000," +
"volume=6.0[a] ;[a][s]amix=inputs=2:duration=first", "-ss", "0",
"-c:a", "aac", audioPath