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Sur d’autres sites (6443)

  • 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 determine correct codec to use

    6 janvier 2015, par nha

    I am trying to use .y4m files that I feed into Chrome for playing.
    This is the only format that I can use.

    I have a set of .y4m files that are working for my use case, taken from here.
    For example let’s say that I use the file mobile_qcif_7.5fps.y4m.

    I also have a .mp4 file (specifically the sample small.mp4 file from techslides ). I know how to convert small.mp4 to small.y4m with the following command :

    ffmpeg -y -i small.mp4 small.y4m

    I would like the resulting file to be accepted by Chrome, just like the other file.
    What options should I use (and how to find them) ?

    Additional information

    ffprobe gives :

    $ ffprobe small.y4m 
    
avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
    
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
    
[yuv4mpegpipe @ 0x23160c0] Estimating duration from bitrate, this may be inaccurate
    
Input #0, yuv4mpegpipe, from 'small.y4m':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0.0: Video: rawvideo, yuv420p, 560x320, 30 fps, 30 tbr, 30 tbn, 30 tbc
    

    

    
$ ffprobe mobile_qcif_7.5fps.y4m
    
avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
    
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
    
[yuv4mpegpipe @ 0x1e080c0] max_analyze_duration reached
    
[yuv4mpegpipe @ 0x1e080c0] Estimating duration from bitrate, this may be inaccurate
    
Input #0, yuv4mpegpipe, from 'mobile_qcif_7.5fps.y4m':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0.0: Video: rawvideo, yuv420p, 176x144, PAR 128:117 DAR 1408:1053, 7.50 fps, 7.50 tbr, 7.50 tbn, 7.50 tbc

    OS : I am using ffmpeg in Ubuntu 13.10 from the default repository : I ran sudo apt-get install ffmpeg libavcodec-extra-53

    Complete console output

    $ ffmpeg -y -i small.mp4 small.y4m
    
ffmpeg version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2000-2014 the Libav developers
    
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
    
*** THIS PROGRAM IS DEPRECATED ***
    
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isomavc1
    
    creation_time   : 2010-03-20 21:29:11
    
    encoder         : HandBrake 0.9.4 2009112300
    
  Duration: 00:00:05.56, start: 0.000000, bitrate: 551 kb/s
    
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
    Stream #0.1(eng): Audio: aac, 48000 Hz, mono, s16, 83 kb/s
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
[buffer @ 0x7274e0] w:560 h:320 pixfmt:yuv420p
    
Output #0, yuv4mpegpipe, to 'small.y4m':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isomavc1
    
    creation_time   : 2010-03-20 21:29:11
    
    encoder         : Lavf53.21.1
    
    Stream #0.0(und): Video: rawvideo, yuv420p, 560x320, q=2-31, 200 kb/s, 90k tbn, 30 tbc
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press ctrl-c to stop encoding
    
frame=  166 fps=  0 q=0.0 Lsize=   43576kB time=5.53 bitrate=64513.5kbits/s    
    
video:0kB audio:0kB global headers:0kB muxing overhead inf%

    Head of the files

    Not sure if this is relevant, but the text content of both files begin like that :

    mobile_qcif_7.5fps.y4m
    
YUV4MPEG2 W176 H144 F15:2 Ip A128:117
    
FRAME
    

    
small.y4m (invalid)
    
YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
    
FRAME

    Additional experiment

    Taking the sample mobile_qcif_7.5fps.y4m, turning it into a .mp4 file and then back into a .y4m produces an invalid file (at least for Chrome).

    Answer to comments in the answer of @SirDarius

    Following the suggestion of @SirDarius ; I tried the following commands.
    They failed to produce a valid file.

    # [COMMAND]   # [RESULT] [HEADER]
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv444p -y small_yuv444p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C444 XYSCSS=444
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv422p -y small_yuv422p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C422 XYSCSS=422
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p -y small_yuv420p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv411p -y small_yuv411p.y4m   # KO   YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C411 XYSCSS=411
    

    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p9 -y small_yuv420p9.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p9 XYSCSS=420P9
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p12 -y small_yuv420p12.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p12 XYSCSS=420P12
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p14 -y small_yuv420p14.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p14 XYSCSS=420P14
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p16 -y small_yuv420p16.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p16 XYSCSS=420P16

    When trying other formats (like yuv420p12be, which was in the output of -pix_fmts), I had the following output (hence my previous trials) :

    $  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p12be -y small_yuv420p12be.y4m 
    
ffmpeg version N-68884-g3ebd76a Copyright (c) 2000-2015 the FFmpeg developers
    
  built on Jan  6 2015 11:03:21 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
    
  configuration: 
    
  libavutil      54. 16.100 / 54. 16.100
    
  libavcodec     56. 19.100 / 56. 19.100
    
  libavformat    56. 18.100 / 56. 18.100
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  6.100 /  5.  6.100
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x21d0220] overread end of atom 'colr' by 1 bytes
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isomavc1
    
    creation_time   : 2010-03-20 21:29:11
    
    encoder         : HandBrake 0.9.4 2009112300
    
  Duration: 00:00:05.57, start: 0.000000, bitrate: 551 kb/s
    
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
      encoder         : JVT/AVC Coding
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 83 kb/s (default)
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
[yuv4mpegpipe @ 0x21d8180] ERROR: yuv4mpeg can only handle yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, yuv444p10, yuv422p10, yuv420p10, yuv444p12, yuv422p12, yuv420p12, yuv444p14, yuv422p14, yuv420p14, yuv444p16, yuv422p16, yuv420p16 and gray16 pixel formats. Use -pix_fmt to select one.
    
Output #0, yuv4mpegpipe, to 'small_yuv420p12be.y4m':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isomavc1
    
    encoder         : Lavf56.18.100
    
    Stream #0:0(und): Video: rawvideo ([12][11]3Y / 0x59330B0C), yuv420p12be, 560x320, q=2-31, 200 kb/s, 7.50 fps, 7.50 tbn, 7.50 tbc (default)
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
      encoder         : Lavc56.19.100 rawvideo
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
    
Could not write header for output file #0 (incorrect codec parameters ?): Input/output error

    After that, I also tried to edit with an hexadecimal editor (bless) the small_yuv420p.y4m file. I replace C420mpeg2 by C420, and the file was accepted by Chrome.
    What does the number in 420p[number] correspond to ? It is not explained there.
    Is there any way to make ffmpeg output this kind of header files ?

    @SirDarius, thank you again for your help.

    The question

    (in case you forgot after this text blob)

    How can I convert the small.mp4 into a small.y4m file that has the same properties as the mobile_qcif_7.5fps.y4m file ?

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