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  • ffmpeg silence detect and removal

    6 septembre 2014, par Zahlii

    I am trying to use the following command with the latest ffmpeg build to remove silence from my .mp3 files :

    ffmpeg -i SILENCE.mp3 -af silencedetect=n=-50dB:d=1 -y -ab 192k  SILENCE_OUT.mp3

    However, the following output is produced :

    ffmpeg version N-66154-g1654ca7 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep  5 2014 22:10:38 with gcc 4.8.3 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
    
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
    
modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
    
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
    
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
    
able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
    
 --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
    
libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
    
  libavutil      54.  7.100 / 54.  7.100
    
  libavcodec     56.  1.100 / 56.  1.100
    
  libavformat    56.  4.100 / 56.  4.100
    
  libavdevice    56.  0.100 / 56.  0.100
    
  libavfilter     5.  1.100 /  5.  1.100
    
  libswscale      3.  0.100 /  3.  0.100
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  0.100 / 53.  0.100
    
Input #0, mp3, from 'SILENCE.mp3':
    
  Metadata:
    
    title           : Snowblind (Featuring Tasha Baxter)
    
    artist          : Au5
    
    album           : Snowblind (Featuring Tasha Baxter)
    
    genre           : Electronica
    
    performer       : Au5
    
    track           : 1/1
    
    date            : 2014
    
    album_artist    : Au5,Tasha Baxter
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: isommp42
    
    encoder         : Lavf55.42.100
    
  Duration: 00:05:50.80, start: 0.025057, bitrate: 192 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
    
Output #0, mp3, to 'SILENCE_OUT.mp3':
    
  Metadata:
    
    TIT2            : Snowblind (Featuring Tasha Baxter)
    
    TPE1            : Au5
    
    TALB            : Snowblind (Featuring Tasha Baxter)
    
    TCON            : Electronica
    
    TPE3            : Au5
    
    TRCK            : 1/1
    
    TDRL            : 2014
    
    TPE2            : Au5,Tasha Baxter
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: isommp42
    
    TSSE            : Lavf56.4.100
    
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p, 192 kb/s
    
    Metadata:
    
      encoder         : Lavc56.1.100 libmp3lame
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
    
Press [q] to stop, [?] for help
    
[silencedetect @ 0000000004398f40] silence_start: -0.00628118
    
[silencedetect @ 0000000004398f40] silence_end: 3.21413 | silence_duration: 3.22
    
041
    
[silencedetect @ 0000000004398f40] silence_start: 343.844
    
[libmp3lame @ 00000000043b2940] Trying to remove 1152 samples, but the queue is
    
empty
    
size=    8223kB time=00:05:50.79 bitrate= 192.0kbits/s
    
video:0kB audio:8222kB subtitle:0kB other streams:0kB global headers:0kB muxing
    
overhead: 0.011485%

    The generated audio file however still has the original length without any silence removed.
    See the following images :
    http://i.imgur.com/nVxe5lX.png

    Any help is appreciated !

    EDIT :
    Alright, silence detect is only DETECTING the silence. Not removing it. I will try to post a solution for this.

  • ffmpeg can't stream to remote client

    4 septembre 2014, par KFL

    I’m building a simple ffmpeg command line on my laptop to stream from its camera. The command line reads (verbose output at the botton) :

    host1> ffmpeg -v verbose \
    
              -f dshow \
    
              -i video="Camera":audio="Microphone" \
    
              -r 30 -g 0 -vcodec h264 -acodec libmp3lame \
    
              -tune zerolatency \
    
              -preset ultrafast \
    
              -f mpegts udp://12.34.56.78:12345

    Firstly, it works locally. I.e., I can view the output by using ffplay on the same host :

    host1> ffplay -hide_banner -v udp://12.34.56.78:12345

    Now what is NOT working is when I do this from another machine in the same network. It shows a nan progress :

    host2> ffplay -hide_banner -v udp://12.34.56.78:12345
    
    nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0  

    I used ncat to dump the raw content. But there’s no output :

    host2>\ncat\ncat -v -u 12.34.56.78 12345
    
Ncat: Version 5.59BETA1 ( http://nmap.org/ncat )
    
Ncat: Connected to 12.34.56.78:12345.
    
(...and nothing happen...)

    Note that I can exclude firewall issues as I used ncat to communicate with each other across the wire using the same port and protocol (UDP). This works and they can chat to each other :

    host1> ncat -l -u -p 12345
    
host2> ncat -u 12.34.56.78 12345

    Any hint ?

    I’m using Windows x64 with FFMPEG 64bit installed from here. Below is the Output of my ffmpeg command :

    C:\ffmpeg\bin>ffmpeg -v verbose -f dshow -i video="Integrated Camera":audio="Microphone (Realtek High Definition Audio)" -r 30 -g 0 -vcodec h264 -acodec libmp3lame -tune zerolatency -preset ultrafast -f mpegts udp://12.34.56.78:12345
    
ffmpeg version N-66012-g97b8809 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep  1 2014 00:21:15 with gcc 4.8.3 (GCC)
    
  configuration: --disable-static --enable-shared --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-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-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
    
  libavutil      54.  7.100 / 54.  7.100
    
  libavcodec     56.  1.100 / 56.  1.100
    
  libavformat    56.  3.100 / 56.  3.100
    
  libavdevice    56.  0.100 / 56.  0.100
    
  libavfilter     5.  0.103 /  5.  0.103
    
  libswscale      3.  0.100 /  3.  0.100
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  0.100 / 53.  0.100
    
Guessed Channel Layout for  Input Stream #0.1 : stereo
    
Input #0, dshow, from 'video=Integrated Camera:audio=Microphone (Realtek High Definition Audio)':
    
  Duration: N/A, start: 171840.657000, bitrate: N/A
    
    Stream #0:0: Video: rawvideo, bgr24, 640x480, 30 fps, 30 tbr, 10000k tbn, 30 tbc
    
    Stream #0:1: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
    
Matched encoder 'libx264' for codec 'h264'.
    
[graph 0 input from stream 0:0 @ 0000000000470aa0] w:640 h:480 pixfmt:bgr24 tb:1/10000000 fr:10000000/333333 sar:0/1 sws_param:flags=2
    
[auto-inserted scaler 0 @ 0000000004326d00] w:iw h:ih flags:'0x4' interl:0
    
[format @ 0000000004325a00] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
    
[auto-inserted scaler 0 @ 0000000004326d00] w:640 h:480 fmt:bgr24 sar:0/1 -> w:640 h:480 fmt:yuv444p sar:0/1 flags:0x4
    
No pixel format specified, yuv444p for H.264 encoding chosen.
    
Use -pix_fmt yuv420p for compatibility with outdated media players.
    
[graph 1 input from stream 0:1 @ 0000000000460c20] tb:1/44100 samplefmt:s16 samplerate:44100 chlayout:0x3
    
[audio format for output stream 0:1 @ 00000000004601a0] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 0:1'
    
[auto-inserted resampler 0 @ 00000000004604a0] ch:2 chl:stereo fmt:s16 r:44100Hz -> ch:2 chl:stereo fmt:s16p r:44100Hz
    
[libx264 @ 000000000081bb20] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 000000000081bb20] profile High 4:4:4 Intra, level 3.0, 4:4:4 8-bit
    
[mpegts @ 000000000081abe0] muxrate VBR, pcr every 3 pkts, sdt every 200, pat/pmt every 40 pkts
    
Output #0, mpegts, to 'udp://12.34.56.78:12345':
    
  Metadata:
    
    encoder         : Lavf56.3.100
    
    Stream #0:0: Video: h264 (libx264), yuv444p, 640x480, q=-1--1, 30 fps, 90k tbn, 30 tbc
    
    Metadata:
    
      encoder         : Lavc56.1.100 libx264
    
    Stream #0:1: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p
    
    Metadata:
    
      encoder         : Lavc56.1.100 libmp3lame
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
    
Press [q] to stop, [?] for help
    
*** 1 dup!
    
frame=  241 fps= 31 q=28.0 Lsize=    3439kB time=00:00:08.03 bitrate=3506.4kbits/s dup=1 drop=0
    
video:3035kB audio:125kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 8.791966%
    
Input file #0 (video=Integrated Camera:audio=Microphone (Realtek High Definition Audio)):
    
  Input stream #0:0 (video): 240 packets read (221184000 bytes); 240 frames decoded;
    
  Input stream #0:1 (audio): 16 packets read (1411200 bytes); 16 frames decoded (352800 samples);
    
  Total: 256 packets (222595200 bytes) demuxed
    
Output file #0 (udp://12.34.56.78:12345):
    
  Output stream #0:0 (video): 241 frames encoded; 241 packets muxed (3108187 bytes);
    
  Output stream #0:1 (audio): 306 frames encoded (352512 samples); 307 packets muxed (128313 bytes);
    
  Total: 548 packets (3236500 bytes) muxed
    
[libx264 @ 000000000081bb20] frame I:241   Avg QP:27.97  size: 12897
    
[libx264 @ 000000000081bb20] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 000000000081bb20] coded y,u,v intra: 26.3% 0.5% 0.0%
    
[libx264 @ 000000000081bb20] i16 v,h,dc,p: 19% 28% 21% 31%
    
[libx264 @ 000000000081bb20] kb/s:3095.29
    
[dshow @ 0000000000467720] real-time buffer[Integrated Camera] too full (90% of size: 3041280)! frame dropped!
    
Received signal 2: terminating. (I pressed CTRL-C)

  • ffmpeg silence detect not properly working

    6 septembre 2014, par Zahlii

    I am trying to use the following command with the latest ffmpeg build to remove silence from my .mp3 files :

    ffmpeg -i SILENCE.mp3 -af silencedetect=n=-50dB:d=1 -y -ab 192k  SILENCE_OUT.mp3

    However, the following output is produced :

    ffmpeg version N-66154-g1654ca7 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep  5 2014 22:10:38 with gcc 4.8.3 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
    
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
    
modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
    
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
    
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
    
able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
    
 --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
    
libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
    
  libavutil      54.  7.100 / 54.  7.100
    
  libavcodec     56.  1.100 / 56.  1.100
    
  libavformat    56.  4.100 / 56.  4.100
    
  libavdevice    56.  0.100 / 56.  0.100
    
  libavfilter     5.  1.100 /  5.  1.100
    
  libswscale      3.  0.100 /  3.  0.100
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  0.100 / 53.  0.100
    
Input #0, mp3, from 'SILENCE.mp3':
    
  Metadata:
    
    title           : Snowblind (Featuring Tasha Baxter)
    
    artist          : Au5
    
    album           : Snowblind (Featuring Tasha Baxter)
    
    genre           : Electronica
    
    performer       : Au5
    
    track           : 1/1
    
    date            : 2014
    
    album_artist    : Au5,Tasha Baxter
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: isommp42
    
    encoder         : Lavf55.42.100
    
  Duration: 00:05:50.80, start: 0.025057, bitrate: 192 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
    
Output #0, mp3, to 'SILENCE_OUT.mp3':
    
  Metadata:
    
    TIT2            : Snowblind (Featuring Tasha Baxter)
    
    TPE1            : Au5
    
    TALB            : Snowblind (Featuring Tasha Baxter)
    
    TCON            : Electronica
    
    TPE3            : Au5
    
    TRCK            : 1/1
    
    TDRL            : 2014
    
    TPE2            : Au5,Tasha Baxter
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: isommp42
    
    TSSE            : Lavf56.4.100
    
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p, 192 kb/s
    
    Metadata:
    
      encoder         : Lavc56.1.100 libmp3lame
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
    
Press [q] to stop, [?] for help
    
[silencedetect @ 0000000004398f40] silence_start: -0.00628118
    
[silencedetect @ 0000000004398f40] silence_end: 3.21413 | silence_duration: 3.22
    
041
    
[silencedetect @ 0000000004398f40] silence_start: 343.844
    
[libmp3lame @ 00000000043b2940] Trying to remove 1152 samples, but the queue is
    
empty
    
size=    8223kB time=00:05:50.79 bitrate= 192.0kbits/s
    
video:0kB audio:8222kB subtitle:0kB other streams:0kB global headers:0kB muxing
    
overhead: 0.011485%

    The generated audio file however still has the original length without any silence removed.
    See the following images :
    http://prntscr.com/4k52m5

    Any help is appreciated !

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