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• De-interlace hardware with FFMpeg Cuda/cuvid decoder is not working anymore ?

  15 novembre 2017, par Red5goahead

  Is it possible that with Nvidia whql driver (385.69) for Windows 10 x64 1709 Cuda is not working to deinterlace H264 video stream ?

  Mpc-HC, lav codec screenshot setup
  

  Please refer to this one minute sample /111 MB

  I tried with MPC-HC and FFMPEG h264_cuvid decoder with -hwaccels and -deint switch (-resize it’s working fine for example), no other sw filter in the chain of course, the result color space is Cuda/NV12

• 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.

• FFMpeg/video4linux2,v4l2 : The v4l2 frame is 46448 bytes, but 153600 bytes are expected (Webcam capture not fast enough ?)

  30 août 2013, par user763410

  I am trying to capture webcam output in linux/ubuntu. I have a chicony webcam (lenovo laptop). I am running inside a VMWARE virtual machine. The capture is not proceeding beyond 10 seconds. can you please help.

  The command I used is :

  $ ffmpeg -y  -f video4linux2 -r 20 -s 160x120 -i /dev/video0 -acodec libfaac -ab 128k  /tmp/web.avi

  The most important message I am getting is :

  [video4linux2,v4l2 @ 0x9e43fa0] The v4l2 frame is 46448 bytes, but 153600 bytes are expected

  Complete message from ffmpeg :

  ffmpeg version N-55159-gf118b41 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 18 2013 09:09:13 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-libass --prefix=/opt/ffmpeg --enable-debug --enable-libfreetype
  
    libavutil      52. 40.100 / 52. 40.100
  
    libavcodec     55. 19.100 / 55. 19.100
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
  [video4linux2,v4l2 @ 0x9e43fa0] The V4L2 driver changed the video from 160x120 to 320x240
  
  [video4linux2,v4l2 @ 0x9e43fa0] The driver changed the time per frame from 1/20 to 1/15
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 6424.338678, bitrate: 18432 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 18432 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
  
  Codec AVOption ab (set bitrate (in bits/s)) specified for output file #0 (/tmp/web.avi) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  Output #0, avi, to '/tmp/web.avi':
  
    Metadata:
  
      ISFT            : Lavf55.12.102
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x240, q=2-31, 200 kb/s, 20 tbn, 20 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  [video4linux2,v4l2 @ 0x9e43fa0] The v4l2 frame is 46448 bytes, but 153600 bytes are expected
  
  /dev/video0: Invalid data found when processing input
  
  frame=   29 fps= 14 q=3.5 Lsize=      87kB time=00:00:01.45 bitrate= 490.0kbits/s    
  
  video:80kB audio:0kB subtitle:0 global headers:0kB muxing overhead 7.760075%
  
  [video4linux2,v4l2 @ 0x9e43fa0] Some buffers are still owned by the caller on close.