Sur d’autres sites (4906)

• how to convert 16-bit RGB Frame Buffer to a viewable format ?

  29 décembre 2012, par CoolAJ86

  I'm working with someone else's code on a device which can put an image to /dev/fb/0 and show up on video out or send it over the network to a client application.

  I don't have access to the old source for the client app, but I know the following about the data :

  • 720x480
  • 16-bit
  • RGB (I'm no sure if it's 5,5,5 or 5,6,5)
  • RAW (no headers whatsoever)
  • cat-able to /dev/fb/0
  • 675kb

  How can I give this a header or convert it to JPEG, BMP, or a RAW type that I could then view in a desktop application ?

  Ultimately, I want it to be jpeg and viewable in a browser, but anything I can see with my eyes will work for now.

  Success

  (see the comments below)

  ffmpeg \
  
    -vcodec rawvideo \
  
    -f rawvideo \
  
    -pix_fmt rgb565 \
  
    -s 720x480 \
  
    -i in-buffer.raw \
  
    \
  
    -f image2 \
  
    -vcodec mjpeg \
  
    out-buffer.jpg

  • github.com/coolaj86/image-examples
  • image-examples/scripts/rgbtools-torgb
  • image-examples/scripts/rgbtools-fromrgb

  Failed Attempts

  Shows the image three times widthwise with almost no color, and squashed vertically :

  rawtoppm -rgb -interpixel 720 480 fb.raw > fb.ppm

  Shows the image, but with streaks and squashed vertically and bad color :

  rawtoppm -rgb -interrow 720 480 fb.raw > fb.ppm

  Similar to the above

  convert -depth 16 -size 720x480 frame_buffer.rgb fb.jpeg

• Anomalie #2977 : Impossible d’effacer les messages

  14 avril 2013, par b b

  Commité dans la branche de dev histoire d’avoir un avis sur la modif avant de reporter en 3.0 : http://zone.spip.org/trac/spip-zone/changeset/72040

• FFMPEG overlay issue for 2 videos, sound missing from second input

  7 septembre 2014, par Abhishek Singh

  I’m trying to achive an overlay with ffmpeg wich take the two flv files as input and make a output and both videos playing simultaneously. things are working fine with below ffmpeg command :

  ffmpeg -i input1.flv -vf "[in] scale=359:320, pad=2*iw+6:ih [left]; movie=input2.flv, scale=359:320 [right]; [left][right] overlay=365:0 [out]" -b:v 3600k -y output.flv

  But issue is with the sound of second video and that is missing from the output.flv, only input1 sound is available in the output.flv.

  Console output is :

  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3
  
   --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib
  
  --enable-frei0r --enable-libass --enable-lib`enter code here`opencore-amrnb --enable-libopencore-
  
  amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut -
  
  -enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger -
  
  -enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --
  
  enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enab
  
  le-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52.  9.100 / 52.  9.100
  
    libavcodec     54. 77.100 / 54. 77.100
  
    libavformat    54. 37.100 / 54. 37.100
  
    libavdevice    54.  3.100 / 54.  3.100
  
    libavfilter     3. 23.102 /  3. 23.102
  
    libswscale      2.  1.102 /  2.  1.102
  
    libswresample   0. 17.101 /  0. 17.101
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, flv, from 'input1.flv':
  
    Metadata:
  
      canSeekToEnd    : false
  
      createdby       : FMS 4.0
  
      creationdate    : Mon Jan 07 07:05:40 2013
  
      encoder         : Lavf54.37.100
  
    Duration: 00:03:04.81, start: 0.000000, bitrate: 314 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 160x120, 3600 kb/s, 1k tbr, 1k tbn, 1k tb
  
  c
  
      Stream #0:1: Audio: mp3, 22050 Hz, mono, s16, 32 kb/s
  
  Output #0, flv, to 'output.flv':
  
    Metadata:
  
      canSeekToEnd    : false
  
      createdby       : FMS 4.0
  
      creationdate    : Mon Jan 07 07:05:40 2013
  
      encoder         : Lavf54.37.100
  
      Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 724x320, q=2-31,
  
  3600 kb/s, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 22050 Hz, mono, s16p
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> flv)
  
    Stream #0:1 -> #0:1 (mp3 -> libmp3lame)
  
  Press [q] to stop, [?] for help
  
  frame=  120 fps=0.0 q=4.5 size=     550kB time=00:00:08.57 bitrate= 525.3kbits/s
  
  frame=  225 fps=221 q=2.0 size=    1422kB time=00:00:18.26 bitrate= 637.6kbits/s
  
  Buffer queue overflow, dropping.
  
  [Parsed_overlay_4 @ 02259ae0] Buffer queue overflow, dropping.
  
      Last message repeated 1 times
  
  frame=  338 fps=222 q=2.0 size=    2414kB time=00:00:26.97 bitrate= 733.0kbits/s
  
  Buffer queue overflow, dropping.
  
  [Parsed_overlay_4 @ 02259ae0] Buffer queue overflow, dropping.
  
      Last message repeated 12 times
  
  frame=  452 fps=223 q=2.0 size=    3326kB time=00:00:35.38 bitrate= 770.1kbits/s
  
  frame=  562 fps=223 q=2.0 size=    4246kB time=00:00:43.15 bitrate= 806.0kbits/s
  
  Buffer queue overflow, dropping.
  
  [Parsed_overlay_4 @ 02259ae0] Buffer queue overflow, dropping.
  
      Last message repeated 11 times
  
  frame=  669 fps=221 q=2.0 size=    5237kB time=00:00:51.28 bitrate= 836.6kbits/s
  
  frame=  777 fps=220 q=2.0 size=    6105kB time=00:00:58.75 bitrate= 851.2kbits/s
  
  frame=  893 fps=222 q=2.0 size=    6897kB time=00:01:06.72 bitrate= 846.8kbits/s
  
  frame= 1006 fps=222 q=2.0 size=    7701kB time=00:01:14.60 bitrate= 845.6kbits/s
  
  frame= 1121 fps=223 q=2.0 size=    8539kB time=00:01:22.45 bitrate= 848.3kbits/s
  
  frame= 1235 fps=223 q=2.0 size=    9316kB time=00:01:30.39 bitrate= 844.3kbits/s
  
  frame= 1344 fps=223 q=2.0 size=   10135kB time=00:01:37.98 bitrate= 847.3kbits/s
  
  Buffer queue overflow, dropping.
  
  [Parsed_overlay_4 @ 02259ae0] Buffer queue overflow, dropping.
  
      Last message repeated 33 times
  
  frame= 1437 fps=220 q=2.0 size=   10800kB time=00:01:46.67 bitrate= 829.3kbits/s
  
  frame= 1540 fps=219 q=2.0 size=   11577kB time=00:01:54.16 bitrate= 830.7kbits/s
  
  frame= 1651 fps=219 q=2.0 size=   12330kB time=00:02:01.64 bitrate= 830.3kbits/s
  
  frame= 1756 fps=218 q=2.0 size=   13141kB time=00:02:09.06 bitrate= 834.1kbits/s
  
  frame= 1859 fps=217 q=2.0 size=   13879kB time=00:02:16.28 bitrate= 834.3kbits/s
  
  frame= 1962 fps=217 q=2.0 size=   14703kB time=00:02:23.69 bitrate= 838.2kbits/s
  
  frame= 2070 fps=217 q=2.0 size=   15448kB time=00:02:30.98 bitrate= 838.2kbits/s
  
  frame= 2176 fps=216 q=2.0 size=   16241kB time=00:02:38.46 bitrate= 839.6kbits/s
  
  Buffer queue overflow, dropping.
  
  [Parsed_overlay_4 @ 02259ae0] Buffer queue overflow, dropping.
  
      Last message repeated 20 times
  
  frame= 2275 fps=215 q=2.0 size=   16990kB time=00:02:46.78 bitrate= 834.5kbits/s
  
  frame= 2389 fps=216 q=1.6 size=   17784kB time=00:02:54.44 bitrate= 835.1kbits/s
  
  frame= 2493 fps=216 q=2.0 size=   18555kB time=00:03:01.73 bitrate= 836.4kbits/s
  
  frame= 2534 fps=216 q=2.0 Lsize=   18945kB time=00:03:04.81 bitrate= 839.7kbits/
  
  s
  
  video:18227kB audio:588kB subtitle:0 global headers:0kB muxing overhead 0.691204
  
  %

  i think -map is filter that is for the audio handling of both video.see this link.

  Superimposing two videos onto a static image ?

  Thanks in Advance.