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• FFMPEG - How to pipe RMS_level and pts_time metadata without generating unwanted metadata

  6 février 2020, par Tovi Newman

  I am trying to find the loudest (highest rms_level) moment in an audio file, but I need to pipe the metadata rather than write to a file.

  I converted the answer found here : [https://superuser.com/questions/1183663/determining-audio-level-peaks-with-ffmpeg][1]

  By removing the write to file command and adding a pipe.
  Here’s what I’ve got.

  ffmpeg -i loudSoft.mp3 -af astats=metadata=1:reset=1,ametadata=print:key=lavfi.astats.Overall.RMS_level -f null - 2> result.txt

  The only problem is, now I’ve got a lot of unwanted metadata before and after the RMS_level and pts_time data as well as [Parsed_ametadata_1 @ 0x7f9d42c37500] being printed on each line. None of that was being written when I was writing to a file instead of piping. (all I need is the time and the rms.)

  Here is an abridged version of what I get when I write to file :

  frame:0    pts:0       pts_time:0
  
  lavfi.astats.Overall.RMS_level=-inf
  
  frame:1    pts:47      pts_time:0.00106576
  
  lavfi.astats.Overall.RMS_level=-165.163347
  
  frame:2    pts:1199    pts_time:0.0271882
  
  lavfi.astats.Overall.RMS_level=-99.736394
  
  frame:3    pts:2351    pts_time:0.0533107
  
  lavfi.astats.Overall.RMS_level=-88.112282
  
  frame:4    pts:3503    pts_time:0.0794331
  
  lavfi.astats.Overall.RMS_level=-86.554314
  
  frame:5    pts:4655    pts_time:0.105556
  
  lavfi.astats.Overall.RMS_level=-82.977501
  
  frame:6    pts:5807    pts_time:0.131678
  
  lavfi.astats.Overall.RMS_level=-79.698739
  
  frame:7    pts:6959    pts_time:0.1578
  
  lavfi.astats.Overall.RMS_level=-76.629393
  
  frame:8    pts:8111    pts_time:0.183923
  
  lavfi.astats.Overall.RMS_level=-71.581211
  
  frame:9    pts:9263    pts_time:0.210045
  
  lavfi.astats.Overall.RMS_level=-75.038503
  
  frame:10   pts:10415   pts_time:0.236168

  And here is what I’m looking at :

  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple clang version 11.0.0 (clang-1100.0.33.16)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mp3, from 'loudSoft2.mp3':
  
    Metadata:
  
      encoder         : Lavf58.29.100
  
    Duration: 00:00:09.85, start: 0.025057, bitrate: 128 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc58.54
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
  
  Press [q] to stop, [?] for help
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] frame:0    pts:0       pts_time:0
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-inf
  
  Output #0, null, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf58.29.100
  
      Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
  
      Metadata:
  
        encoder         : Lavc58.54.100 pcm_s16le
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] frame:1    pts:47      pts_time:0.00106576
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-165.163347
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] frame:2    pts:1199    pts_time:0.0271882
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-99.736394
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] frame:3    pts:2351    pts_time:0.0533107
  
  
  
  
  
  *** MIDDLE OMITTED FOR BREVITY ***
  
  
  
  
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-88.532185
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] frame:375  pts:430895  pts_time:9.77086
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-88.594276
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] frame:376  pts:432047  pts_time:9.79698
  
  [Parsed_ametadata_1 @ 0x7f9d42c37500] lavfi.astats.Overall.RMS_level=-88.654138
  
  size=N/A time=00:00:09.82 bitrate=N/A speed=82.6x    
  
  video:0kB audio:1692kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Channel: 1
  
  [Parsed_astats_0 @ 0x7f9d42c37280] DC offset: 0.000001
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Min level: -0.000106
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Max level: 0.000115
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Min difference: 0.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Max difference: 0.000077
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Mean difference: 0.000017
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS difference: 0.000022
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Peak level dB: -78.752617
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS level dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS peak dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS trough dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Crest factor: 3.126627
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Flat factor: 0.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Peak count: 2
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Bit depth: 32/32
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Dynamic range: 76.274252
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Zero crossings: 246
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Zero crossings rate: 0.222624
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of NaNs: 0
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of Infs: 0
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of denormals: 0
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Channel: 2
  
  [Parsed_astats_0 @ 0x7f9d42c37280] DC offset: 0.000001
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Min level: -0.000106
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Max level: 0.000115
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Min difference: 0.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Max difference: 0.000077
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Mean difference: 0.000017
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS difference: 0.000022
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Peak level dB: -78.752617
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS level dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS peak dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS trough dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Crest factor: 3.126627
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Flat factor: 0.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Peak count: 2
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Bit depth: 32/32
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Dynamic range: 76.274252
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Zero crossings: 246
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Zero crossings rate: 0.222624
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of NaNs: 0
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of Infs: 0
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of denormals: 0
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Overall
  
  [Parsed_astats_0 @ 0x7f9d42c37280] DC offset: 0.000001
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Min level: -0.000106
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Max level: 0.000115
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Min difference: 0.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Max difference: 0.000077
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Mean difference: 0.000017
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS difference: 0.000022
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Peak level dB: -78.752617
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS level dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS peak dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] RMS trough dB: -88.654138
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Flat factor: 0.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Peak count: 2.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Bit depth: 32/32
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of samples: 1105
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of NaNs: 0.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of Infs: 0.000000
  
  [Parsed_astats_0 @ 0x7f9d42c37280] Number of denormals: 0.000000

• FFmpeg only reading one channel

  29 août 2017, par AbstractDissonance

  Trying to read a stereo wav file and ffmpeg is only reading one channel. ffprobe returns 2 channels.

  I have used -ac 2 and then added -channel_layout stereo but all return 1 channel(or basically filling half the buffer I created).

  Basically the output size of ffmpeg is about half the wav file size.

  What I would like is for it to return every channel in

  Channel1_sample1, channel2_sample1, ..., ChannelN_sample1, channel1_sample2, etc...

  But, in reality, I’d rather just have it work with stereo ;) I’m giving it plenty large enough buffer to read to, so that isn’t the problem either.

  Here is the output

  ffprobe.exe -hide_banner -v quiet -print_format flat -show_streams -i temp.wav
  
  streams.stream.0.index=0
  
  streams.stream.0.codec_name="pcm_s16le"
  
  streams.stream.0.codec_long_name="PCM signed 16-bit little-endian"
  
  streams.stream.0.profile="unknown"
  
  streams.stream.0.codec_type="audio"
  
  streams.stream.0.codec_time_base="1/44100"
  
  streams.stream.0.codec_tag_string="[1][0][0][0]"
  
  streams.stream.0.codec_tag="0x0001"
  
  streams.stream.0.sample_fmt="s16"
  
  streams.stream.0.sample_rate="44100"
  
  streams.stream.0.channels=2
  
  streams.stream.0.channel_layout="unknown"
  
  streams.stream.0.bits_per_sample=16
  
  streams.stream.0.id="N/A"
  
  streams.stream.0.r_frame_rate="0/0"
  
  streams.stream.0.avg_frame_rate="0/0"
  
  streams.stream.0.time_base="1/44100"
  
  streams.stream.0.start_pts="N/A"
  
  streams.stream.0.start_time="N/A"
  
  streams.stream.0.duration_ts=14200200
  
  streams.stream.0.duration="322.000000"
  
  streams.stream.0.bit_rate="1411200"
  
  streams.stream.0.max_bit_rate="N/A"
  
  streams.stream.0.bits_per_raw_sample="N/A"
  
  streams.stream.0.nb_frames="N/A"
  
  streams.stream.0.nb_read_frames="N/A"
  
  streams.stream.0.nb_read_packets="N/A"
  
  streams.stream.0.disposition.default=0
  
  streams.stream.0.disposition.dub=0
  
  streams.stream.0.disposition.original=0
  
  streams.stream.0.disposition.comment=0
  
  streams.stream.0.disposition.lyrics=0
  
  streams.stream.0.disposition.karaoke=0
  
  streams.stream.0.disposition.forced=0
  
  streams.stream.0.disposition.hearing_impaired=0
  
  streams.stream.0.disposition.visual_impaired=0
  
  streams.stream.0.disposition.clean_effects=0
  
  streams.stream.0.disposition.attached_pic=0
  
  streams.stream.0.disposition.timed_thumbnails=0
  
  ffmpeg.exe -i temp.wav -loglevel quiet -f s16le -ac 2 -channel_layout stereo -

  temp.wav is just a standard stereo wav file.

• Mangled output when printing strings from FFProbe STDERR

  9 février 2018, par spikespaz

  I’m trying to make a simple function to wrap around FFProbe, and most of the data can be retrieved correctly.

  The problem is when actually printing the strings to the command line using both Windows Command Prompt and Git Bash for Windows, the output appears mangled and out of order.

  Some songs (specifically the file Imagine Dragons - Hit Parade_ Best of the Dance Music Charts\80 - Beazz - Lime (Extended Mix).flac) are missing metadata. I don’t know why, but the dictionary the function below returns is empty.

  FFProbe outputs its results to stderr which can be piped to subprocess.PIPE, decoded, and parsed. I chose regex for the parsing bit.

  This is a slimmed down version of my code below, for the output take a look at the Github gist.

  #! /usr/bin/env python3
  
  # -*- coding: utf-8 -*-
  
  
  
  import os
  
  
  
  from glob import glob
  
  from re import findall, MULTILINE
  
  from subprocess import Popen, PIPE
  
  
  
  
  
  def glob_from(path, ext):
  
      """Return glob from a directory."""
  
      working_dir = os.getcwd()
  
      os.chdir(path)
  
  
  
      file_paths = glob("**/*." + ext)
  
  
  
      os.chdir(working_dir)
  
  
  
      return file_paths
  
  
  
  
  
  def media_metadata(file_path):
  
      """Use FFPROBE to get information about a media file."""
  
      stderr = Popen(("ffprobe", file_path), shell=True, stderr=PIPE).communicate()[1].decode()
  
  
  
      metadata = {}
  
  
  
      for match in findall(r"(\w+)\s+:\s(.+)$", stderr, MULTILINE):
  
          metadata[match[0].lower()] = match[1]
  
  
  
      return metadata
  
  
  
  
  
  if __name__ == "__main__":
  
      base = "C:/Users/spike/Music/Deezloader"
  
  
  
      for file in glob_from(base, "flac"):
  
          meta = media_metadata(os.path.join(base, file))
  
          title_length = meta.get("title", file) + " - " + meta.get("length", "000")
  
  
  
          print(title_length)

  Output Gist
  Output Raw

  I don’t understand why the output (the strings can be retrieved from the regex pattern effectively, however the output is strangely formatted when printing) appears disordered only when printing to the console using python’s print function. It doesn’t matter how I build the string to print, concatenation, comma-delimited arguments, whatever.

  I end up with the length of the song first, and the song name second but without space between the two. The dash is hanging off the end for some reason. Based on the print statement in the code before, the format should be Title - 000 ({title} - {length}) but the output looks more like 000Title -. Why ?