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• Mixing a FLV audio stream with a WAV background track, and converting to MP3 with SoX and FFmpeg

  7 septembre 2012, par tubbo

  I'm building a Flash-based recording application for a contracted web site. It streams the recorded voice (via SWF) to a Red5 server, then uses a combination of FFmpeg and SoX to compile the vocal audio with a lower-in-volume background music track. This all has to happen on-demand, that is, when a user "saves" his or her vocal recording.

  Here is an example command I will be running. Names have been changed to protect the innocent. The filenames describe their role in the final file :

  sox --combine mix -p --no-show-progress --norm "|ffmpeg -i /usr/share/red5/webapps/audiorecorder/stream/SPOKEN_VOICE.flv -t wav pipe:1" /var/www/ufiles/music/BACKGROUND_MUSIC.wav - | ffmpeg -i pipe:1 /var/www/ufiles/recordings/COMPILED_AUDIO_RECORDING.mp3

  When I run this command in the shell, this is what happens :

  $ sox --combine mix -p --no-show-progress --norm "|ffmpeg -i audioStream_1321399534128_21.flv -ar 44100 -ac 2 -t wav pipe:1" wrong.wav - | ffmpeg -i pipe:1 ~/www/trauma101.com/compiled.mp3
  
  ffmpeg version N-34884-g7575980, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Nov 15 2011 14:06:49 with gcc 4.4.5
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libx264 --enable-x11grab --enable-libspeex
  
    libavutil    51. 25. 0 / 51. 25. 0
  
    libavcodec   53. 34. 0 / 53. 34. 0
  
    libavformat  53. 20. 0 / 53. 20. 0
  
    libavdevice  53.  4. 0 / 53.  4. 0
  
    libavfilter   2. 48. 1 /  2. 48. 1
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  ffmpeg version N-34884-g7575980, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Nov 15 2011 14:06:49 with gcc 4.4.5
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libx264 --enable-x11grab --enable-libspeex
  
    libavutil    51. 25. 0 / 51. 25. 0
  
    libavcodec   53. 34. 0 / 53. 34. 0
  
    libavformat  53. 20. 0 / 53. 20. 0
  
    libavdevice  53.  4. 0 / 53.  4. 0
  
    libavfilter   2. 48. 1 /  2. 48. 1
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [libspeex @ 0x1e36b20] Missing Speex header, assuming defaults.
  
  Input #0, flv, from 'audioStream_1321399534128_21.flv':
  
    Metadata:
  
      novideocodec    : 0
  
      server          : Red5 Server 1.0.0 RC2 Rev: 4295
  
      creationdate    : Tue Nov 15 15:25:41 PST 2011
  
      canSeekToEnd    : true
  
    Duration: 00:00:06.77, start: 0.000000, bitrate: 43 kb/s
  
      Stream #0:0: Audio: speex, 16000 Hz, 1 channels, s16
  
  Invalid duration specification for t: wav
  
  sox FAIL formats: can't open input pipe `|ffmpeg -i audioStream_1321399534128_21.flv -ar 44100 -ac 2 -t wav pipe:1': premature EOF

  I think the issue is stemming from the conversion from FLV to WAV in FFmpeg, and since it's being piped in it causes the whole process to fail. I always get that duration warning, but when FFmpeg outputs to a .wav file and the SoX command is run separately, I can still get a WAV from SoX and convert that to MP3 manually. I'd like to do all this in one line, piping the data between applications.

  What do I do ?

• Convert wmv to mp4 with ffmpeg failing

  10 janvier 2012, par Morph

  I've seen quite a few posts on this, but I can't piece together whether I am doing things right, wrong, or need to download more stuff. I am converting from wmv to mp4 without complaints, but then when I go to play it on the browser window (HTML5) the player just turns grey and blanks out the controls.

  Installing ffmpeg I do

  ./configure --disable-yasm ; make ; make install

  Unless I include the disable yasm it wont go any further. Then I do

  ffmpeg -i myvideo.wmv myvideo.mp4

  All good so far. In my html source I have :

    <video width="320" height="240" controls="controls">
  
    <source src="myvideo.mp4" type="&#39;video/mp4;" codecs="avc1.42E01E, mp4a.40.2"></source>
  
    Your browser does not support the video tag.
  
    </video>

  I am playing this in Chrome 15 and ffmpeg -v is

  ffmpeg version 0.8.6, Copyright (c) 2000-2011 the FFmpeg developers
  
  built on Dec  1 2011 15:42:06 with gcc 4.1.2 20080704 (Red Hat 4.1.2-51)
  
  configuration: --disable-yasm
  
  libavutil    51.  9. 1 / 51.  9. 1
  
  libavcodec   53.  7. 0 / 53.  7. 0
  
  libavformat  53.  4. 0 / 53.  4. 0
  
  libavdevice  53.  1. 1 / 53.  1. 1
  
  libavfilter   2. 23. 0 /  2. 23. 0
  
  libswscale    2.  0. 0 /  2.  0. 0

  So I get the HTML5, click on it to play the movie but then the control bar greys out, leaving the play button, but then the play button cannot be clicked and nothing plays.

  Is there something wrong with what I have done above ? Do I need to download some separate mp4 driver and compile it ? I see people referring to h.264 but I thoughts ffmpeg had that already included...

• ffmpeg - Adding audio to a complex filter

  9 janvier 2015, par user3630651

  I am using c# to programmatically write an ffmpeg command to crossfade a logo into a video. I also need to cut a couple of seconds into the video.

  Here is the currently working ffmpeg command :
  (No audio)

  -y -loop 1 -t 3.2 -i "logo.png" -i "video.mp4" -r 29.97 -f lavfi -i color=black -filter_complex "
  
  [0:v] scale=640:-1, crop=640:360, format=pix_fmts=yuv420p, fade=t=out:st=2.7:d=0.5:alpha=1, setpts=PTS-STARTPTS [va0];
  
  [1:v] format=pix_fmts=yuv420p, fade=t=in:st=0:d=0.5:alpha=1, setpts=PTS-STARTPTS + 3.2 / TB [va1];
  
  [2:v] scale=640:-1, crop=640:360, trim=duration=147.768 [over];
  
  [over][va0] overlay [over1];
  
  [over1][va1] overlay=format=yuv420 [outv]
  
  " -vcodec libx264 -map [outv] "Finished.mp4"

  I want to add audio from "video.mp4"([1:a]) to the output starting a few seconds in, how do I go about this without causing a buffer overflow ?

  Thank you for your help in advance !

  ---

  Edit, Adding ffmpeg output on request :

  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
  
  Input #0, image2, from 'C:\VideoApplicationAssets\test\logo.png':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba, 500x400 [SAR 9065:9065 DAR 5:4], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\VideoApplicationAssets\test\2.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2014-03-07 04:36:36
  
    Duration: 00:02:24.68, start: 0.000000, bitrate: 574 kb/s
  
      Stream #1:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 475 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-03-07 04:36:36
  
        handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
  Input #2, lavfi, from 'color=black':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #2:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
  
  [libx264 @ 000000000049cf60] using SAR=1/1
  
  [libx264 @ 000000000049cf60] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 000000000049cf60] profile High, level 3.0
  
  [libx264 @ 000000000049cf60] 264 - core 142 r2479 dd79a61 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'C:\VideoApplicationAssets\test\Finished.mp4':
  
    Metadata:
  
      encoder         : Lavf56.3.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc (default)
  
      Metadata:
  
        encoder         : Lavc56.1.100 libx264
  
  Stream mapping:
  
    Stream #0:0 (png) -> scale
  
    Stream #1:0 (h264) -> format
  
    Stream #2:0 (rawvideo) -> scale
  
    overlay -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  frame=  149 fps=0.0 q=29.0 size=      23kB time=00:00:03.23 bitrate=  57.6kbits/s    
  
  frame=  240 fps=239 q=29.0 size=     200kB time=00:00:06.27 bitrate= 260.6kbits/s    
  
  frame=  345 fps=229 q=29.0 size=     343kB time=00:00:09.77 bitrate= 287.2kbits/s    
  
  frame=  431 fps=215 q=29.0 size=     496kB time=00:00:12.64 bitrate= 321.1kbits/s    
  
  frame=  502 fps=200 q=29.0 size=     633kB time=00:00:15.01 bitrate= 345.5kbits/s    
  
  frame=  659 fps=219 q=29.0 size=     737kB time=00:00:20.25 bitrate= 298.0kbits/s    
  
  frame=  843 fps=240 q=26.0 size=     790kB time=00:00:26.39 bitrate= 245.1kbits/s    
  
  frame=  988 fps=246 q=29.0 size=     982kB time=00:00:31.23 bitrate= 257.7kbits/s    
  
  frame= 1124 fps=249 q=29.0 size=    1200kB time=00:00:35.76 bitrate= 274.9kbits/s    
  
  frame= 1292 fps=257 q=29.0 size=    1410kB time=00:00:41.37 bitrate= 279.3kbits/s    
  
  frame= 1437 fps=260 q=29.0 size=    1773kB time=00:00:46.21 bitrate= 314.2kbits/s    
  
  frame= 1565 fps=260 q=29.0 size=    2206kB time=00:00:50.48 bitrate= 358.0kbits/s    
  
  frame= 1709 fps=262 q=29.0 size=    2542kB time=00:00:55.28 bitrate= 376.7kbits/s    
  
  frame= 1872 fps=266 q=29.0 size=    2920kB time=00:01:00.72 bitrate= 393.9kbits/s    
  
  frame= 2000 fps=265 q=29.0 size=    3157kB time=00:01:04.99 bitrate= 397.9kbits/s    
  
  frame= 2108 fps=262 q=29.0 size=    3378kB time=00:01:08.60 bitrate= 403.4kbits/s    
  
  frame= 2196 fps=257 q=29.0 size=    3592kB time=00:01:11.53 bitrate= 411.4kbits/s    
  
  frame= 2291 fps=254 q=29.0 size=    3791kB time=00:01:14.70 bitrate= 415.7kbits/s    
  
  frame= 2394 fps=251 q=29.0 size=    4013kB time=00:01:18.14 bitrate= 420.7kbits/s    
  
  frame= 2492 fps=248 q=29.0 size=    4191kB time=00:01:21.41 bitrate= 421.7kbits/s    
  
  frame= 2670 fps=253 q=29.0 size=    4323kB time=00:01:27.35 bitrate= 405.4kbits/s    
  
  frame= 2829 fps=256 q=29.0 size=    4437kB time=00:01:32.65 bitrate= 392.3kbits/s    
  
  frame= 2972 fps=257 q=29.0 size=    4749kB time=00:01:37.43 bitrate= 399.3kbits/s    
  
  frame= 3143 fps=261 q=29.0 size=    5016kB time=00:01:43.13 bitrate= 398.4kbits/s    
  
  frame= 3247 fps=259 q=29.0 size=    5430kB time=00:01:46.60 bitrate= 417.3kbits/s    
  
  frame= 3396 fps=260 q=29.0 size=    5737kB time=00:01:51.57 bitrate= 421.2kbits/s    
  
  frame= 3544 fps=262 q=29.0 size=    5995kB time=00:01:56.51 bitrate= 421.5kbits/s    
  
  frame= 3691 fps=263 q=29.0 size=    6251kB time=00:02:01.42 bitrate= 421.7kbits/s    
  
  frame= 3880 fps=267 q=29.0 size=    6342kB time=00:02:07.72 bitrate= 406.7kbits/s    
  
  frame= 4059 fps=270 q=29.0 size=    6426kB time=00:02:13.70 bitrate= 393.7kbits/s    
  
  frame= 4158 fps=267 q=29.0 size=    6699kB time=00:02:17.00 bitrate= 400.5kbits/s    
  
  frame= 4309 fps=268 q=29.0 size=    6911kB time=00:02:22.04 bitrate= 398.6kbits/s    
  
  frame= 4388 fps=265 q=29.0 size=    7187kB time=00:02:24.67 bitrate= 407.0kbits/s    
  
  frame= 4430 fps=260 q=-1.0 Lsize=    7537kB time=00:02:27.74 bitrate= 417.9kbits/s dup=0 drop=2    
  
  
  
  video:7491kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.618146%
  
  [libx264 @ 000000000049cf60] frame I:40    Avg QP:18.78  size: 22979
  
  [libx264 @ 000000000049cf60] frame P:1964  Avg QP:22.33  size:  3056
  
  [libx264 @ 000000000049cf60] frame B:2426  Avg QP:27.35  size:   309
  
  [libx264 @ 000000000049cf60] consecutive B-frames: 24.5%  5.1%  6.6% 63.7%
  
  [libx264 @ 000000000049cf60] mb I  I16..4: 19.5% 35.8% 44.7%
  
  [libx264 @ 000000000049cf60] mb P  I16..4:  4.1%  5.7%  2.0%  P16..4: 24.4%  6.9%  2.5%  0.0%  0.0%    skip:54.5%
  
  [libx264 @ 000000000049cf60] mb B  I16..4:  0.3%  0.2%  0.1%  B16..8: 11.1%  0.7%  0.1%  direct: 0.4%  skip:87.0%  L0:44.2% L1:52.6% BI: 3.2%
  
  [libx264 @ 000000000049cf60] 8x8 transform intra:45.7% inter:56.0%
  
  [libx264 @ 000000000049cf60] coded y,uvDC,uvAC intra: 45.5% 44.9% 11.1% inter: 5.9% 6.3% 0.4%
  
  [libx264 @ 000000000049cf60] i16 v,h,dc,p: 24% 39% 14% 23%
  
  [libx264 @ 000000000049cf60] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 24% 24%  3%  4%  4%  5%  3%  4%
  
  [libx264 @ 000000000049cf60] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 26% 14%  5%  7%  7%  7%  5%  6%
  
  [libx264 @ 000000000049cf60] i8c dc,h,v,p: 57% 22% 17%  4%
  
  [libx264 @ 000000000049cf60] Weighted P-Frames: Y:6.6% UV:4.4%
  
  [libx264 @ 000000000049cf60] ref P L0: 79.1% 10.7%  8.3%  1.9%  0.1%
  
  [libx264 @ 000000000049cf60] ref B L0: 92.1%  7.3%  0.7%
  
  [libx264 @ 000000000049cf60] ref B L1: 94.8%  5.2%
  
  [libx264 @ 000000000049cf60] kb/s:415.11