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• ffmpeg set buf_len

  2 avril 2013, par Jeetendra_Nath_Jha

  I have been taken input from the device file /dev/video49.

  using ffmpeg, following command writing from the terminal :

  ffmpeg -f video4linux2 -i /dev/video49 -target ntsc-vcd -s 1920x1080 pixfmt:yuv420p -vstats -bufsize 225k -an -f mpegts -vcodec mpeg4 udp://127.0.0.1:10000?pkt_size=1316

  but it gives an error given below :

  ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Mar 20 2013 15:06:14 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
  
    configuration: 
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
  [video4linux2,v4l2 @ 0x95862a0] buf_len[0] = 1048576 < expected frame size 3110400
  
  /dev/video49: Cannot allocate memory

  I don't know how to set the buf_len here...

  because in an error it says that the buf_len is need to be set.

• After converting FLV to MP4 format using ffmpeg the MP4 file has 0 bytes [closed]

  28 mars 2013, par user2138489

  Using ffmpeg I converted an FLV file to an MP4 file. But the MP4 file has 0 bytes. The command which i used to convert is

  ffmpeg -i sample.flv -b 1104k -ab 122k sample.mp4

  This is the output I got for the above ffmpeg command :

  ffmpeg version 0.8.5-4:0.8.5-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  
    built on Jan 24 2013 18:01:36 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.
  
  [flv @ 0x64f7a0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from '/home/kirthiga/Desktop/videopine/test.flv':
  
    Metadata:
  
      creationdate    : Thu Mar 28 12:46:29
  
    Duration: 00:00:09.82, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 22050 Hz, mono, s16
  
  [buffer @ 0x64f720] w:320 h:240 pixfmt:yuv420p
  
  encoder 'aac' is experimental and might produce bad results.
  
  Add '-strict experimental' if you want to use it.

• PHP ffmpeg conversion error

  6 mars 2016, par Enn Fenn

  I tried to convert some videos with ffmpeg and PHP.

  When I execute the following command in PHP exec()

  /usr/local/bin/ffmpeg -i /home/test/public_html/test.m4v -vcodec libx264 -acodec libmp3lame -r 30 -s 640x480 -b 100k /home/test/public_html/output_640x480_test.m4v

  Output :

  /usr/local/bin/ffmpeg: line 4: /var/log/ffmpeg.log: Permission denied
  
  FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Apr 18 2012 05:19:10 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  
    configuration: --prefix=/usr/local/src/ffmpeg --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-libdirac --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab --enable-libxvid --enable-libvorbis --enable-libtheora
  
    libavutil     50.36. 0 / 50.36. 0
  
    libavcore      0.16. 1 /  0.16. 1
  
    libavcodec    52.108. 0 / 52.108. 0
  
    libavformat   52.93. 0 / 52.93. 0
  
    libavdevice   52. 2. 3 / 52. 2. 3
  
    libavfilter    1.74. 0 /  1.74. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1200.00 (1200/1) -> 10.00 (10/1)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/test/public_html/test.m4v':
  
    Metadata:
  
      major_brand     : M4VP
  
      minor_version   : 1
  
      compatible_brands: M4VPM4V M4A mp42isom
  
      creation_time   : 2013-03-14 10:08:25
  
      encoder         : Mac OS X v10.7.4 (CMA 891, CM 705.78, x86_64)
  
      date            : 2013-03-10T14:05:41+1100
  
    Duration: 00:00:02.30, start: 0.000000, bitrate: 245 kb/s
  
      Stream #0.0(und): Audio: aac, 32000 Hz, 2 channels (FC), s16, 31 kb/s
  
      Metadata:
  
        creation_time   : 2013-03-14 10:08:25
  
      Stream #0.1(und): Video: h264, yuv420p, 400x226 [PAR 1:1 DAR 200:113], 216 kb/s, 10.35 fps, 10 tbr, 600 tbn, 1200 tbc
  
      Metadata:
  
        creation_time   : 2013-03-14 10:08:25
  
  [buffer @ 0xf6093c0] w:400 h:226 pixfmt:yuv420p
  
  [scale @ 0xf609790] w:400 h:226 fmt:yuv420p -> w:640 h:480 fmt:yuv420p flags:0xa0000004
  
  [libx264 @ 0xf605cd0] broken ffmpeg default settings detected
  
  [libx264 @ 0xf605cd0] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0xf605cd0] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0xf605cd0] speed presets are listed in x264 --help
  
  [libx264 @ 0xf605cd0] profile is optional; x264 defaults to high
  
  Output #0, ipod, to '/home/test/public_html/output_640x480_test.m4v':
  
      Stream #0.0(und): Video: libx264, yuv420p, 640x480 [PAR 150:113 DAR 200:113], q=2-31, 800 kb/s, 90k tbn, 10 tbc
  
      Metadata:
  
        creation_time   : 2013-03-14 10:08:25
  
      Stream #0.1(und): Audio: libmp3lame, 32000 Hz, 2 channels, s16, 64 kb/s
  
      Metadata:
  
        creation_time   : 2013-03-14 10:08:25
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  </profile></speed>

  The same conversion is working fine in another server. But not in our current server. What should I do to get rid of this error ?