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• When capturing input with ffmpeg can't set video bitrate

  11 mai 2014, par Emanuele

  When capturing input from FFmpeg with following command line :
  ffmpeg -f x11grab -r 30 -s 1920x1080 -i :0.0 -vcodec mpeg4 -b:v 10000k -flags +aic+mv4 -f alsa -ac 2 -i pulse -strict experimental test.mp4
  this is the output I get :

  ffmpeg version 0.8.10-4:0.8.10-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Feb  6 2014 20:56:59 with gcc 4.6.3
  *** THIS PROGRAM IS DEPRECATED ***
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  [x11grab @ 0x1b1c7a0] device : :0.0 -> display : :0.0 x : 0 y : 0 width : 1920 height : 1080
  [x11grab @ 0x1b1c7a0] shared memory extension  found
  [x11grab @ 0x1b1c7a0] Estimating duration from bitrate, this may be inaccurate
  Input #0, x11grab, from ’:0.0’ :
    Duration : N/A, start : 1399805986.592884, bitrate : 1990656 kb/s
      Stream #0.0 : Video : rawvideo, bgra, 1920x1080, 1990656 kb/s, 30 tbr, 1000k tbn, 30 tbc
  [alsa @ 0x1b2c600] capture with some ALSA plugins, especially dsnoop, may hang.
  [alsa @ 0x1b2c600] Estimating duration from bitrate, this may be inaccurate
  Input #1, alsa, from ’pulse’ :
    Duration : N/A, start : 1399805986.561124, bitrate : N/A
      Stream #1.0 : Audio : pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  File ’test.mp4’ already exists. Overwrite ? [y/N] y
  Incompatible pixel format ’bgra’ for codec ’mpeg4’, auto-selecting format ’yuv420p’
  [buffer @ 0x1b4d840] w:1920 h:1080 pixfmt:bgra
  [avsink @ 0x1b40480] auto-inserting filter ’auto-inserted scaler 0’ between the filter ’src’ and the filter ’out’
  [scale @ 0x1b1c6e0] w:1920 h:1080 fmt:bgra -> w:1920 h:1080 fmt:yuv420p flags:0x4
  Output #0, mp4, to ’test.mp4’ :
    Metadata :
      encoder : Lavf53.21.1
      Stream #0.0 : Video : mpeg4, yuv420p, 1920x1080, q=2-31, 200 kb/s, 30 tbn, 30 tbc
      Stream #0.1 : Audio : aac, 48000 Hz, 2 channels, s16, 200 kb/s
  Stream mapping :
    Stream #0.0 -> #0.0
    Stream #1.0 -> #0.1
  Press ctrl-c to stop encoding
  ^Cframe= 1283 fps= 42 q=31.0 Lsize=   10882kB time=42.71 bitrate=2087.3kbits/s dup=473 drop=70    
  video:9875kB audio:980kB global headers:0kB muxing overhead 0.251384%
  Received signal 2 : terminating.
  ema@scv : $ ./capvideo.sh 
  ffmpeg version 0.8.10-4:0.8.10-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Feb  6 2014 20:56:59 with gcc 4.6.3
  *** THIS PROGRAM IS DEPRECATED ***
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  [x11grab @ 0x24667a0] device : :0.0 -> display : :0.0 x : 0 y : 0 width : 1920 height : 1080
  [x11grab @ 0x24667a0] shared memory extension  found
  [x11grab @ 0x24667a0] Estimating duration from bitrate, this may be inaccurate
  Input #0, x11grab, from ’:0.0’ :
    Duration : N/A, start : 1399806153.224758, bitrate : 1990656 kb/s
      Stream #0.0 : Video : rawvideo, bgra, 1920x1080, 1990656 kb/s, 30 tbr, 1000k tbn, 30 tbc
  [alsa @ 0x2476600] capture with some ALSA plugins, especially dsnoop, may hang.
  [alsa @ 0x2476600] Estimating duration from bitrate, this may be inaccurate
  Input #1, alsa, from ’pulse’ :
    Duration : N/A, start : 1399806153.198090, bitrate : N/A
      Stream #1.0 : Audio : pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  File ’test.mp4’ already exists. Overwrite ? [y/N] y
  Incompatible pixel format ’bgra’ for codec ’mpeg4’, auto-selecting format ’yuv420p’
  [buffer @ 0x2497840] w:1920 h:1080 pixfmt:bgra
  [avsink @ 0x2497c00] auto-inserting filter ’auto-inserted scaler 0’ between the filter ’src’ and the filter ’out’
  [scale @ 0x24a9680] w:1920 h:1080 fmt:bgra -> w:1920 h:1080 fmt:yuv420p flags:0x4
  Output #0, mp4, to ’test.mp4’ :
    Metadata :
      encoder : Lavf53.21.1
      Stream #0.0 : Video : mpeg4, yuv420p, 1920x1080, q=2-31, 200 kb/s, 30 tbn, 30 tbc
      Stream #0.1 : Audio : aac, 48000 Hz, 2 channels, s16, 200 kb/s
  Stream mapping :
    Stream #0.0 -> #0.0
    Stream #1.0 -> #0.1
  Press ctrl-c to stop encoding
  ^Cframe=  229 fps= 36 q=24.8 Lsize=    2316kB time=7.59 bitrate=2497.9kbits/s dup=43 drop=4    
  video:2134kB audio:176kB global headers:0kB muxing overhead 0.253411%
  Received signal 2 : terminating.
  

  As you can see the video is being saved with 200kbs no matter what option I set ; what am I doing wrong ?
  I’m running this on Ubuntu 12.04, ffmpeg is ffmpeg version 0.8.10-4:0.8.10-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers built on Feb  6 2014 20:56:59 with gcc 4.6.3.

  Cheers

• Missing audio stream which is required by this ffm at Raspberry PI using ffmpeg

  17 mai 2014, par batuman

  I am trying to stream video from my Raspberry PI using ffserver, raspivid and ffmpeg. My command is as follow

  ffserver -f /etc/ffserver.conf & raspivid -vf -t 0 -w 450 -h 200 -fps 25 -b 2000000 -o - | ffmpeg -f h264 -r 25 -c:v h264 -i - -c:v libx264 -c:a libmp3lame http://localhost:8090/feed1.ffm

  It looks working, I see the video displayed on the monitor and got the error as

  Missing audio stream which is required by this ffm

  The whole output at console is as follow.

  ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
  
    built on May 10 2014 17:04:06 with gcc 4.6 (Debian 4.6.3-14+rpi1)
  
    configuration: --prefix=/home/pi/ffmpeg_build --extra-cflags=-I/home/pi/ffmpeg_build/include --extra-ldflags=-L/home/pi/ffmpeg_build/lib --bindir=/home/pi/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 82.100 / 52. 82.100
  
    libavcodec     55. 60.103 / 55. 60.103
  
    libavformat    55. 37.102 / 55. 37.102
  
    libavdevice    55. 13.101 / 55. 13.101
  
    libavfilter     4.  5.100 /  4.  5.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, h264, from 'pipe:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuv420p, 450x200, 25 fps, 25 tbr, 1200k tbn, 50 tbc
  
  Sat May 17 07:10:56 2014 127.0.0.1 - - [GET] "/feed1.ffm HTTP/1.1" 200 4175
  
  Missing audio stream which is required by this ffm

  I searched and found that I have to use blank audio using libmp3lame. Is it the only way to do ?And can’t find installer for linux for libmp3lame.

• Ffmpeg - Remove rotate metadata

  16 mai 2014, par Ron I

  When I extract the images from a video, the resulting images are getting rotated. The orientation of the video is correct, and the images are upside down. The metadata for the original video is 180, and also for the output file, so it looks like it is copying that data and additionally rotating 180 degrees. However, since the original video is already rotated, it is flipping the video upside down.

  I would like to remove the metadata for the output file containing the ’rotate’ command. I tried adding -vf rotate=0, but it didn’t work.

  Here is the command I am running :

  ffmpeg -i left.MOV -r 1 -f image2 left-03%d.png

  I assume this is what is throwing it off (it looks like it is copying the rotate metadata from the input file and applying it to the output file) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'left.MOV':
  
  rotate          : 180
  
  
  
  Output #0, image2, to 'left-03%d.png':
  
  
  
  Metadata:
  
        rotate          : 180

  Here’s the full output :

      ffmpeg version 2.2.1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 11 2014 22:50:35 with Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libavresample   1.  2.  0 /  1.  2.  0
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'left.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2014-05-14 16:24:27
  
      make            : Apple
  
      make-eng        : Apple
  
      encoder         : 7.1.1
  
      encoder-eng     : 7.1.1
  
      date            : 2014-05-14T09:23:48-0700
  
      date-eng        : 2014-05-14T09:23:48-0700
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
    Duration: 00:00:10.98, start: 0.000000, bitrate: 795 kb/s
  
      Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 568x320, 728 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        rotate          : 180
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
  Output #0, image2, to 'left-03%d.png':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      model-eng       : iPhone 5
  
      make            : Apple
  
      make-eng        : Apple
  
      model           : iPhone 5
  
      encoder-eng     : 7.1.1
  
      date            : 2014-05-14T09:23:48-0700
  
      date-eng        : 2014-05-14T09:23:48-0700
  
      encoder         : Lavf55.33.100
  
      Stream #0:0(und): Video: png, rgb24, 568x320, q=2-31, 200 kb/s, 90k tbn, 1 tbc (default)
  
      Metadata:
  
        rotate          : 180
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (h264 -> png)
  
  Press [q] to stop, [?] for help
  
  frame=   14 fps=0.0 q=0.0 Lsize=N/A time=00:00:14.00 bitrate=N/A dup=0 drop=315    
  
  video:1521kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -100.001411%