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• Wrong Bitrate after ffmpeg WAV to MP3 Conversion

  27 février 2015, par Nick Weisser

  I converted a WAV file to MP3. ffmpeg’s output states that it’s being converted into 128k bitrate, but it ends up with only 32k bitrate.

  # ffmpeg -i 3.28.09.WAV -acodec libmp3lame -ab 128k 3.28.09.mp3
  
  ffmpeg version 0.8.6-6:0.8.6-1, Copyright (c) 2000-2013 the Libav developers
  
    built on Mar 24 2013 07:20:17 with gcc 4.7.2
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [wav @ 0x954f800] max_analyze_duration reached
  
  Input #0, wav, from '3.28.09.WAV':
  
    Duration: 00:27:07.47, bitrate: 2304 kb/s
  
      Stream #0.0: Audio: pcm_s24le, 48000 Hz, 2 channels, s32, 2304 kb/s
  
  Incompatible sample format 's32' for codec 'libmp3lame', auto-selecting format 's16'
  
  Output #0, mp3, to '3.28.09.mp3':
  
    Metadata:
  
      TSSE            : Lavf53.21.1
  
      Stream #0.0: Audio: libmp3lame, 48000 Hz, 2 channels, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  size=   25430kB time=1627.51 bitrate= 128.0kbits/s    
  
  video:0kB audio:25430kB global headers:0kB muxing overhead 0.000495%

  The original WAV file is RIFF (little-endian) data, WAVE audio, Microsoft PCM, 24 bit, stereo 48000 Hz.

  The output MP3 file is an audio file with ID3 version 2.4.0, contains : MPEG ADTS, layer III, v1, 32 kbps, 48 kHz, Stereo when inspected with the file utility. My PHP library getID3 also state.

  # ffmpeg -i 3.28.09.mp3
  
  ffmpeg version 0.8.6-6:0.8.6-1, Copyright (c) 2000-2013 the Libav developers
  
    built on Mar 24 2013 07:20:17 with gcc 4.7.2
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [mp3 @ 0x8f56800] max_analyze_duration reached
  
  Input #0, mp3, from '3.28.09.mp3':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
    Duration: 00:27:07.51, start: 0.000000, bitrate: 128 kb/s
  
      Stream #0.0: Audio: mp3, 48000 Hz, stereo, s16, 128 kb/s
  
  At least one output file must be specified

  Any ideas what I might be missing here ?

• Autocrop detect error with ffmpeg in python

  2 octobre 2017, par Grady Woodruff

  I am trying to run an autocrop ffmpeg command in python. The command works in Ruby so I am not sure why it isn’t working in Python. I am just trying to run an autocrop on the videos just in case they have black bars on the top/bottom/sides.

  I found this bit of code from this thread a while ago and it has worked for me in Ruby, which makes me think this might be a Python syntax issue because I am running the same version of FFMPEG on my computer.

  Would appreciate any help on this

  Here is the command from that thread in my Python file :

  Code

  import subprocess
  
  
  
  in_file = /path/input.mp4
  
  out_file = /path/output.mp4
  
  
  
  cmd = [
  
      'ffmpeg', 
  
      '-y',
  
      '-i', in_file,
  
      '-vf', 'cropdetect -f null - 2>&1 | awk \'/crop/ { print \$NF }\' | tail -1',
  
      out_file
  
  ]
  
  subprocess.Popen(cmd, stdout = subprocess.PIPE, bufsize=10**8)

  Error

  ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-nonfree --enable-vda
  
    libavutil      55. 58.100 / 55. 58.100
  
   [...]
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [AVFilterGraph @ 0x7f8c23d1dc60] No such filter: 'cropdetect -f null - 2>&1 | awk /crop/ { print $NF } | tail -1'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:0
  
  [aac @ 0x7f8c2400a400] Qavg: 45917.641
  
  [aac @ 0x7f8c2400a400] 2 frames left in the queue on closing
  
  Conversion failed!

  After more searching, I discovered another approach and have been working on running this but still with no luck :

  Code

  import subprocess
  
  
  
  in_file = /path/input.mp4
  
  out_file = /path/output.mp4
  
  
  
  cmd = [
  
      'ffmpeg', 
  
      '-y',
  
      '-i', in_file,
  
      '-vf', 'cropdetect=24:16:0 -y -crf 51 ultrafast -f null /dev/null 2>&1 | grep -o crop=.* | sort -bh | uniq -c | sort -bh | tail -n1 | grep -o crop=.*', 
  
      out_file
  
  ]
  
  subprocess.Popen(cmd, stdout = subprocess.PIPE, bufsize=10**8)

  Error

  ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-nonfree --enable-vda
  
    libavutil      55. 58.100 / 55. 58.100
  
  [ ... ]
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [01/Oct/2017 16:44:25] "GET /home/ HTTP/1.1" 200 13844
  
  [cropdetect @ 0x7f85aca02d00] [Eval @ 0x7fff5cfc1820] Undefined constant or missing '(' in 'y-crf51ultrafast-fnull/dev/null2>&1|grep-ocrop=.*|sort-bh|uniq-c|sort-bh|tail-n1|grep-ocrop=.*'
  
  [cropdetect @ 0x7f85aca02d00] Unable to parse option value "0 -y -crf 51 ultrafast -f null /dev/null 2>&1 | grep -o crop=.* | sort -bh | uniq -c | sort -bh | tail -n1 | grep -o crop=.*"
  
  [cropdetect @ 0x7f85aca02d00] [Eval @ 0x7fff5cfc18a0] Undefined constant or missing '(' in 'y-crf51ultrafast-fnull/dev/null2>&1|grep-ocrop=.*|sort-bh|uniq-c|sort-bh|tail-n1|grep-ocrop=.*'
  
  [cropdetect @ 0x7f85aca02d00] Unable to parse option value "0 -y -crf 51 ultrafast -f null /dev/null 2>&1 | grep -o crop=.* | sort -bh | uniq -c | sort -bh | tail -n1 | grep -o crop=.*"
  
  [cropdetect @ 0x7f85aca02d00] Error setting option reset to value 0 -y -crf 51 ultrafast -f null /dev/null 2>&1 | grep -o crop=.* | sort -bh | uniq -c | sort -bh | tail -n1 | grep -o crop=.*.
  
  [Parsed_cropdetect_0 @ 0x7f85aca02c40] Error applying options to the filter.
  
  [AVFilterGraph @ 0x7f85ac904e20] Error initializing filter 'cropdetect' with args '24:16:0 -y -crf 51 ultrafast -f null /dev/null 2>&1 | grep -o crop=.* | sort -bh | uniq -c | sort -bh | tail -n1 | grep -o crop=.*'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:0
  
  [aac @ 0x7f85ad805000] Qavg: 45917.641
  
  [aac @ 0x7f85ad805000] 2 frames left in the queue on closing
  
  Conversion failed!

• Put audio and video tracks all together

  24 février 2014, par Albert

  I have one video track (xvid) and two audio tracks (ac3) in three different files, and I want to put them together. I succeeded, but there is a problem. This is the command I use :

  ffmpeg -i video.avi -i audio_es.ac3 -i audio_en.ac3 -map 0:0 -map 1:0 -map 2:0 -vcodec copy -acodec copy -acodec copy  video2.avi -newaudio

  And this is the output

  Fmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.3, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
        configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.3 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  
        libavutil     49.15. 0 / 49.15. 0
  
        libavcodec    52.20. 1 / 52.20. 1
  
        libavformat   52.31. 0 / 52.31. 0
  
        libavdevice   52. 1. 0 / 52. 1. 0
  
        libavfilter    0. 4. 0 /  0. 4. 0
  
        libswscale     0. 7. 1 /  0. 7. 1
  
        libpostproc   51. 2. 0 / 51. 2. 0
  
        built on Jan 24 2013 19:42:59, gcc: 4.4.3
  
      [avi @ 0x22be260]non-interleaved AVI
  
      Input #0, avi, from 'video.avi':
  
        Duration: 00:50:01.00, start: 0.000000, bitrate: 2988 kb/s
  
          Stream #0.0: Video: mpeg4, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
  
      Input #1, ac3, from 'audio_es.ac3':
  
        Duration: 00:50:00.99, bitrate: 320 kb/s
  
          Stream #1.0: Audio: ac3, 48000 Hz, stereo, s16, 320 kb/s
  
      Input #2, ac3, from 'audio_en.ac3':
  
        Duration: 00:50:00.99, bitrate: 320 kb/s
  
          Stream #2.0: Audio: ac3, 48000 Hz, stereo, s16, 320 kb/s
  
      Output #0, avi, to 'video3.avi':
  
          Stream #0.0: Video: mpeg4, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], q=2-31, 90k tbn, 25 tbc
  
          Stream #0.1: Audio: ac3, 48000 Hz, stereo, s16, 320 kb/s
  
          Stream #0.2: Audio: mp2, 48000 Hz, stereo, s16, 64 kb/s
  
      Stream mapping:
  
        Stream #0.0 -> #0.0
  
        Stream #1.0 -> #0.1
  
        Stream #2.0 -> #0.2
  
      Press [q] to stop encoding
  
      frame= 9796 fps=5319 q=-1.0 Lsize=  129383kB time=391.84 bitrate=2704.9kbits/s   
  
      video:110097kB audio:18368kB global headers:0kB muxing overhead 0.714597%

  As you see in output stream, it doesn't convert any input file except second audio stream into mp2 (64kbps), while input file is AC3 (320kbps). I don't know how to tell ffmpeg to not convert any file. Just put them together as they are.

  Can anybody help me ?