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• How to record video from old webcam using ffmpeg on Linux ?

  5 février 2015, par Moomin

  After couple of hours I finally accepted my absolute lack of knowledge and decided to post this question here.
  I’m trying to record video from an old external USB webcam (Media-Tech MT400 -> 0c45:6029) with ffmpeg but without much success.

  First thing I’ve tried was to run to try something that works for the built-in webcam) :

  ffmpeg -f v4l2 -i /dev/video1 test.avi

  But that returned a following error :

  Cannot find a proper format for codec 'none' (id 0), pixel format 'none' (id -1)

  Here is what I get from v4l2-ctl -d /dev/video1/ --all --list-formats-ext

  Driver Info (not using libv4l2):
  
          Driver name   : sonixb
  
          Card type     : USB camera
  
          Bus info      : usb-0000:04:00.0-1
  
          Driver version: 3.10.17
  
          Capabilities  : 0x85000001
  
                  Video Capture
  
                  Read/Write
  
                  Streaming
  
                  Device Capabilities
  
          Device Caps   : 0x05000001
  
                  Video Capture
  
                  Read/Write
  
                  Streaming
  
  Priority: 2
  
  Video input : 0 (sonixb: ok)
  
  Format Video Capture:
  
          Width/Height  : 352/288
  
          Pixel Format  : 'S910'
  
          Field         : None
  
          Bytes per Line: 352
  
          Size Image    : 126720
  
          Colorspace    : SRGB
  
  Streaming Parameters Video Capture:
  
          Frames per second: invalid (0/0)
  
          Read buffers     : 2
  
  
  
  
  
  
  
  ioctl: VIDIOC_ENUM_FMT
  
      Index       : 0
  
      Type        : Video Capture
  
      Pixel Format: 'S910'
  
      Name        : S910
  
              Size: Discrete 160x120
  
              Size: Discrete 176x144
  
              Size: Discrete 320x240
  
              Size: Discrete 352x288
  
  
  
      Index       : 1
  
      Type        : Video Capture
  
      Pixel Format: 'BA81'
  
      Name        : BA81
  
              Size: Discrete 160x120
  
              Size: Discrete 176x144

  Unfortunately that was not of much help to me, but I tried capturing webcam output with VLC and recording it which.... WORKED !

  I tried ffmpeg -i vlc-record[...].avi on VLC recording which returned following information :

  Input #0, avi, from 'vlc-record-2015-02-05-05h22m52s-v4l2____dev_video1-.avi':
  
    Duration: 00:00:01.58, start: 0.000000, bitrate: 26937 kb/s
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 352x288, 27671 kb/s, 22.10 tbr, 22.10 tbn, 22.10 tbc

  I thought that was enough information (rawvideo and yuv420p) led to run ffmpeg with following arguments (I have found yuv4 using ffmpeg -formats)

  ffmpeg -f rawvideo -vcodec yuv4 -i /dev/video1 test.avi

  The result was only slightly better than one that I saw after my first attempt :

  [IMGUTILS @ 0x7fff497d3920] Picture size 0x0 is invalid
  
  [rawvideo @ 0x9c4720] Could not find codec parameters for stream 0 (Video: yuv4, yuv420p, -4 kb/s): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  /dev/video1: could not find codec parameters

  Again after some searching and several tries I added ’-video_size cif` option and.... it WORKED !!!!

  Well, not really...

  Input #0, rawvideo, from '/dev/video1':
  
    Duration: N/A, start: 0.000000, bitrate: 30412 kb/s
  
      Stream #0:0: Video: yuv4, yuv420p, 352x288, 30412 kb/s, 25 tbr, 25 tbn, 25 tbc
  
  Output #0, avi, to 'test.avi':
  
    Metadata:
  
      ISFT            : Lavf55.19.104
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 352x288, q=2-31, 200 kb/s, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (yuv4 -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  frame=   13 fps=6.3 q=24.8 Lsize=    1064kB time=00:00:00.52 bitrate=16759.3kbits/s    
  
  video:1058kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.554114%

  LED on webcam turned on as during capturing video with VLC but all that was recorded was TV-like noise.

  So here I am after 7 hours - still without work solution - asking for your help.

  Thanks in advance.

• Read metadata with FFMPEG

  18 février 2015, par Martin Delille

  I’m looking for a way to print a video or audio file metadata using FFMPEG.

  I tried the following command :

  ffmpeg -i DirtyLove.mov

  And got the following result :

  ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Feb 16 2015 18:01:39 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.5.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --disable-indev=qtkit --enable-vda
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Guessed Channel Layout for  Input Stream #0.2 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../DirtyLove/DirtyLove.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2007-09-27 11:23:38
  
    Duration: 00:01:57.16, start: 0.000000, bitrate: 17918 kb/s
  
      Stream #0:0(eng): Video: mjpeg (jpeg / 0x6765706A), yuvj422p(pc, bt470bg/unknown/unknown), 720x576 [SAR 72:72 DAR 5:4], 14839 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2007-09-27 11:23:38
  
        handler_name    : Gestionnaire d�alias Apple
  
        encoder         : Photo - JPEG
  
        timecode        : 10:04:01:11
  
      Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2007-09-27 11:23:38
  
        handler_name    : Gestionnaire d�alias Apple
  
      Stream #0:2(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2007-09-27 11:23:38
  
        handler_name    : Gestionnaire d�alias Apple
  
      Stream #0:3(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2007-09-27 11:29:22
  
        handler_name    : Gestionnaire d�alias Apple
  
        timecode        : 10:04:01:11
  
  At least one output file must be specified

  There should be a timecode that I can’t see.

  Any ideas ?

• Firefox doesn't play mp4 file in HTML5 video

  21 janvier 2016, par Developer

  I recorded a video with my mobile which had the format ".mp4". Now if I load that video in HTML5 video tag, I get an error HTTP "Content-Type" of "video/3gpp" is not supported. Why does Firefox consider the file as 3gpp although it is an mp4 file ?
  If I log the file properties when it is loaded on to browser, I see the following

  { name: "test.mp4", lastModified: 1434536249000, lastModifiedDate: Date 2015-06-17T10:17:29.000Z, size: 41151959, type: "video/mp4" }

  This means firefox identifies the type as mp4 only. But doesn’t play it giving the error HTTP "Content-Type" of "video/3gpp" is not supported.