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• How to remove everything but video and stereo audio stream from video with ffmpeg ?

  20 octobre 2019, par user3776738

  I’m trying to get a clean h264 video from a mkv file.With clean I mean that it has only a video stream plus stereo sound.
  The inputfile can have multiple channels and subtitles and other unknown stuff, which I don’t need.
  I’m using ffmpeg with this command :

   ffmpeg -i "input.mkv" -ac 2 -vf scale=trunc(oh*a/2)*2:480 -c:v libx264 "output.mp4"

  This should give me a 480p video with stereo sound,which I require.
  I tried multiple -map or dispositions commands with ffmpeg to remove the subtitles whithout any success.

  How can I remove everything but video and stereo stream with ffmpeg and get a 480p stereo sound video ?

  Edit :
  Output of ffmpeg - "input.mkv" -i "output.mp4" :

  ffmpeg -i "input.mkv" -i "output.mp4"
  
  ffmpeg version N-91972-gbd10c1e9a8 Copyright (c) 2000-2018 the FFmpeg developer
  
  
  
    built with gcc 8.2.1 (GCC) 20180813
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconf
  
  g --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-li
  
  freetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-am
  
  wb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy -
  
  enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-
  
  ibwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 -
  
  enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --e
  
  able-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --e
  
  able-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --
  
  nable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --ena
  
  le-avisynth
  
    libavutil      56. 19.101 / 56. 19.101
  
    libavcodec     58. 30.100 / 58. 30.100
  
    libavformat    58. 18.101 / 58. 18.101
  
    libavdevice    58.  4.103 / 58.  4.103
  
    libavfilter     7. 32.100 /  7. 32.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  [hevc @ 00000000004a5940] Invalid default display window
  
  Input #0, matroska,webm, from 'input.mkv':
  
    Metadata:
  
      title           : Elysium (2013)
  
      encoder         : libebml v1.3.3 + libmatroska v1.4.4
  
      creation_time   : 2016-01-05T22:30:41.000000Z
  
    Duration: 00:01:02.73, start: 0.166000, bitrate: 53638 kb/s
  
      Chapter #0:0: start 0.000000, end 62.896000
  
      Metadata:
  
        title           : 00:00:00.000
  
      Stream #0:0(eng): Video: hevc (Main 10), yuv420p10le(tv), 3840x1606, SAR 1:
  
   DAR 1920:803, 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
  
      Metadata:
  
        title           : Elysium (2013) - Release for ULTRAHDCLUB
  
        BPS             : 51036975
  
        BPS-eng         : 51036975
  
        DURATION        : 00:01:02.604000000
  
        DURATION-eng    : 00:01:02.604000000
  
        NUMBER_OF_FRAMES: 1501
  
        NUMBER_OF_FRAMES-eng: 1501
  
        NUMBER_OF_BYTES : 399389852
  
        NUMBER_OF_BYTES-eng: 399389852
  
        _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_DATE_UTC: 2016-01-05 22:30:41
  
        _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-05 22:30:41
  
        _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
        _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
      Stream #0:1(eng): Audio: dts (DTS-HD MA), 48000 Hz, 7.1, s16p (default)
  
      Metadata:
  
        title           : DTS-HD MA 7.1 - Blu-ray CEE
  
        BPS             : 2706639
  
        BPS-eng         : 2706639
  
        DURATION        : 00:01:02.561000000
  
        DURATION-eng    : 00:01:02.561000000
  
        NUMBER_OF_FRAMES: 5865
  
        NUMBER_OF_FRAMES-eng: 5865
  
        NUMBER_OF_BYTES : 21166260
  
        NUMBER_OF_BYTES-eng: 21166260
  
        _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_DATE_UTC: 2016-01-05 22:30:41
  
        _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-05 22:30:41
  
        _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
        _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : Elysium (2013)
  
      encoder         : Lavf58.18.101
  
    Duration: 00:01:02.73, start: 0.000000, bitrate: 1671 kb/s
  
      Chapter #1:0: start 0.000000, end 62.730000
  
      Metadata:
  
        title           : 00:00:00.000
  
      Stream #1:0(eng): Video: h264 (High 10) (avc1 / 0x31637661), yuv420p10le, 1
  
  46x480 [SAR 2030:2027 DAR 38773:16216], 1543 kb/s, SAR 15563:15540 DAR 1920:803
  
   23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fl
  
  p, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #1:2(eng): Data: bin_data (text / 0x74786574), 0 kb/s
  
      Metadata:
  
        handler_name    : SubtitleHandler
  
  At least one output file must be specified

• FFmpeg upmix command stereo > 5.1

  2 octobre 2018, par CupNoodleFanatic

  I need to upmix stereo mkv files with chapter, subtitle, audio and video streams to 5.1 flac with a silent center channel. The audio is a single stereo stream, not two mono streams. I need the resulting mkv to contain a single 6 channel flac stream.

  My desired channel layout is FR = FR, FR > SR, FL = FL, FL > SL, Center silent, LFE = FR+FL

  I followed the FFmpeg documentation and was unable to produce the desired mapping.

  The command so far (generated with help from Axiom GUI) :

  ./ffmpeg -i TestIN.mkv -c:v copy -map 0:v? -map_chapters 0 -c:s copy -map 0:s? -c:a flac -sample_fmt s16 -rematrix_maxval 1.0 -ac 6 -map 0:a:0? -map_metadata 0 -f matroska -threads 0 X:\TestOUT.mkv

  Any help would be greatly appreciated.

• Creating a sequence of images from lyrics to use in ffmpeg

  19 septembre 2018, par SKS

  I’m trying to make an MP3 + Lyric -> MP4 program in python.

  I have a lyrics file like this :

  [00:00.60]Revelation, chapter 4
  
  [00:02.34]After these things I looked, 
  
  [00:04.10]and behold a door was opened in heaven, 
  
  [00:06.41]and the first voice which I heard, as it were, 
  
  [00:08.78]of a trumpet speaking with me, said: 
  
  [00:11.09]Come up hither, 
  
  [00:12.16]and I will shew thee the things which must be done hereafter.
  
  [00:15.78]And immediately I was in the spirit: 
  
  [00:18.03]and behold there was a throne set in heaven, 
  
  [00:20.72]and upon the throne one sitting.
  
  [00:22.85]And he that sat, 
  
  [00:23.91]was to the sight like the jasper and the sardine stone; 
  
  [00:26.97]and there was a rainbow round about the throne, 
  
  [00:29.16]in sight like unto an emerald.
  
  [00:31.35]And round about the throne were four and twenty seats; 
  
  [00:34.85]and upon the seats, four and twenty ancients sitting, 
  
  [00:38.03]clothed in white garments, and on their heads were crowns of gold.
  
  [00:41.97]And from the throne proceeded lightnings, and voices, and thunders; 
  
  [00:46.03]and there were seven lamps burning before the throne, 
  
  [00:48.60]which are the seven spirits of God. 
  
  [00:51.23]And in the sight of the throne was, as it were, 
  
  [00:53.79]a sea of glass like to crystal; 
  
  [00:56.16]and in the midst of the throne, and round about the throne, 
  
  [00:59.29]were four living creatures, full of eyes before and behind.
  
  [01:03.79]And the first living creature was like a lion: 

  I’m trying to create a sequence of images from the lyrics to use into ffmpeg.

  os.system(ffmpeg_path + " -r 2 -i " + images_path + "image%1d.png -i " + audio_file + " -vcodec mpeg4 -y " + video_name)

  I tried finding out the number of images to make for each line. I’ve tried subtracting the seconds of the next line from the current line. It works but produces very inconsistent results.

  import os
  
  import datetime
  
  import time
  
  import math
  
  from PIL import Image, ImageDraw
  
  
  
  
  
  ffmpeg_path = os.getcwd() + "\\ffmpeg\\bin\\ffmpeg.exe"
  
  images_path = os.getcwd() + "\\test_output\\"
  
  audio_file = os.getcwd() + "\\audio.mp3"
  
  lyric_file = os.getcwd() + "\\lyric.lrc"
  
  
  
  video_name = "movie.mp4"
  
  
  
  
  
  def save():
  
  
  
      lyric_to_images()
  
      os.system(ffmpeg_path + " -r 2 -i " + images_path + "image%1d.png -i " + audio_file + " -vcodec mpeg4 -y " + video_name)
  
  
  
  
  
  def lyric_to_images():
  
  
  
      file  = open(lyric_file, "r")
  
  
  
      data = file.readlines()
  
  
  
      startOfLyric = True
  
      lstTimestamp = []
  
  
  
      images_to_make = 0
  
      from_second = 0.0
  
      to_second = 0.0
  
  
  
      for line in data:
  
          vTime = line[1:9] # 00:00.60
  
  
  
          temp = vTime.split(':')
  
  
  
          minute = float(temp[0])
  
          #a = float(temp[1].split('.'))
  
          #second = float((minute * 60) + int(a[0]))
  
          second = (minute * 60) + float(temp[1])
  
  
  
          lstTimestamp.append(second)
  
  
  
      counter = 1
  
  
  
      for i, second in enumerate(lstTimestamp):
  
  
  
          if startOfLyric is True:
  
              startOfLyric = False
  
              #first line is always 3 seconds (images to make = 3x2)
  
              for x in range(1, 7):
  
                  writeImage(data[i][10:], 'image' + str(counter))
  
                  counter += 1
  
          else:
  
              from_second = lstTimestamp[i-1]
  
              to_second = second
  
  
  
              difference = to_second - from_second
  
              images_to_make = int(difference * 2)
  
  
  
              for x in range(1, int(images_to_make+1)):
  
                  writeImage(data[i-1][10:], 'image'+str(counter))
  
                  counter += 1
  
  
  
      file.close()
  
  
  
  def writeImage(v_text, filename):
  
  
  
      img = Image.new('RGB', (480, 320), color = (73, 109, 137))
  
  
  
      d = ImageDraw.Draw(img)
  
      d.text((10,10), v_text, fill=(255,255,0))
  
  
  
      img.save(os.getcwd() + "\\test_output\\" + filename + ".png")
  
  
  
  
  
  save()

  Is there any efficient and accurate way to calculate how many images I need to create for each line ?

  Note : Whatever many images I create will have to be multiplied by 2 because I’m using -r 2 for FFmpeg (2 FPS).