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• mplayer generating online three thumbnail of video

  5 mai 2013, par soac

  I am trying to create thumbnail of video using mplayer but it is only creating 3 thumbnail of video and then repeating the last thumbnail again and again.

  MPlayer command 1 :

  mplayer video/1.mp4 -sstep 5 -endpos 25 -nosound -vf scale=96:64 -vo jpeg:quality=80:outdir=$tmpPath 2>log.txt

  Problem : It create 3 different image and then repeat last image again and again.

  MPlayer command 2 :

  mplayer video/1.mp4 -sstep 5 -endpos 25 -nosound -frames 5 -vf scale=96:64 -vo jpeg:quality=80:outdir=$tmpPath 2>log.txt

  Problem : It create 3 different image and then repeat last image 2 times, If I change -frames to 10 than it repeat last image 7 times.

  MPlayer command 3 :

  mplayer video/1.mp4 -ss 5 -nosound -frames 1 -vf scale=96:64 -vo jpeg:quality=80:outdir=$tmpPath /
  video/1.mp4 -ss 10 -nosound -frames 1 -vf scale=96:64 -vo jpeg:quality=80:outdir=$tmpPath /
  video/1.mp4 -ss 15 -nosound -frames 1 -vf scale=96:64 -vo jpeg:quality=80:outdir=$tmpPath /
  video/1.mp4 -ss 20 -nosound -frames 1 -vf scale=96:64 -vo jpeg:quality=80:outdir=$tmpPath /
  video/1.mp4 -ss 15 -nosound -frames 1 -vf scale=96:64 -vo jpeg:quality=80:outdir=$tmpPath /
  2>log.txt
  

  Problem : Same problem as above described. 3 thumbnail difference and other are same. Duration of video is 27 seconds. I run this command on mplayer and mplayer2 but same result. MPlayer Binary are taken from http://sourceforge.net/projects/smplayer/files/

  I want MPlayer to capture thumbnail after every X seconds using MPlayer not FFMPEG. I am already using FFMPEG for creating thumbnail and it is working fine. My Operating System is Windows 7. Log File

  MPlayer Redxii-SVN-r36237-4.6.3 (C) 2000-2013 MPlayer Team Custom build by
  Redxii, http://smplayer.sourceforge.net Compiled against FFmpeg version
  N-52748-g1ef82cc Build date : Sun May 5 03:45:49 EDT 2013 getch2 : 6 can't get
  number of input events [disabling console input] Playing
  D :/wamp/www/videoconverter/content/original/3.mp4. libavformat version 55.4.101
  (internal) libavformat file format detected. [lavf] stream 0 : video (h264), -vid
  0 [lavf] stream 1 : audio (aac), -aid 0, -alang und VIDEO : [H264] 960x540 24bpp
  25.000 fps 2087.1 kbps (254.8 kbyte/s) Clip info : major_brand : isom
  minor_version : 512 compatible_brands : isomiso2avc1mp41 creation_time : 1970-01-01
  00:00:00 encoder : Lavf52.77.0 comment : www.freemake.com Load subtitles in
  D :/wamp/www/videoconverter/content/original/ jpeg : Progressive JPEG disabled.
  jpeg : Baseline JPEG enabled. Opening video filter : [scale w=96 h=64]
  ==========================================================================
  Opening video decoder : [ffmpeg] FFmpeg's libavcodec codec family libavcodec
  version 55.7.100 (internal) Selected video codec : [ffh264] vfm : ffmpeg (FFmpeg
  H.264)
  ==========================================================================
  Audio : no sound Starting playback... Movie-Aspect is 1.78:1 - prescaling to
  correct movie aspect. [swscaler @ 01400520]BICUBIC scaler, from yuv420p to rgb24
  using MMXEXT VO : [jpeg] 96x64 => 113x64 RGB 24-bit jpeg :
  content/tmp/sprites/HxHtQGKbsV - Output directory already exists and is
  writable. Movie-Aspect is 1.78:1 - prescaling to correct movie aspect. VO :
  [jpeg] 96x64 => 113x64 RGB 24-bit jpeg : content/tmp/sprites/HxHtQGKbsV - Output
  directory already exists and is writable. V : 0.0 0/ 0 ??% ??% ??, ?% 0 0 V : 5.8
  0/ 0 ??% ??% ??, ?% 0 0 V : 10.6 0/ 0 ??% ??% ??, ?% 0 0 V : 18.5 0/ 0 ??% ??% ??, ?%
  0 0 V : 25.6 0/ 0 ??% ??% ??, ?% 0 0 V : 35.8 0/ 0 ??% ??% ??, ?% 0 0 V : 35.8 0/ 0
   ??% ??% ??, ?% 0 0 V : 35.8 0/ 0 ??% ??% ??, ?% 0 0 V : 35.8 0/ 0 ??% ??% ??, ?% 0 0
  V : 35.8 0/ 0 ??% ??% ??, ?% 0 0 V : 35.8 0/ 0 ??% ??% ??, ?% 0 0 V : 35.8 0/ 0 ??%
   ??% ??, ?% 0 0 Exiting... (End of file)
  

• Encode video of powerpoint presentation for HTML5 playback

  17 avril 2013, par user2291446

  We have a number of powerpoint presentations that have been converted to 16:9
  aspect ratio and then converted into mp4 "master videos" with an "apple TV" 720p
  profile. These powerpoint presentations are voice annotated. So in essence, we
  show a slide and then let the annotation sound play for a while, then go to the
  next slide, and so on. The resulting mp4 master video is somewhere around 900MB
  on average.

  Here is an example of the master video

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4' :
  Metadata :
      major_brand : isom
      minor_version : 512
      compatible_brands : isomiso2avc1mp41
      creation_time : 1970-01-01 00:00:00
      encoder : Lavf52.104.0
    Duration : 02:00:57.65, start : 0.000000, bitrate : 970 kb/s
      Stream #0:0(und) : Video : h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 836 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
      Metadata :
        creation_time : 1970-01-01 00:00:00
        handler_name : VideoHandler
      Stream #0:1(und) : Audio : aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s
      Metadata :
        creation_time : 1970-01-01 00:00:00
        handler_name : SoundHandler
  

  We are trying to get these presentations to play on the web on as many
  devices/browsers as possible including some that don't do HTML5 (IE7/IE8). We
  have narrowed down our player of choice which is mediaElement and have extracted
  some "cue points" from the powerpoint presentation that mark where the slides
  are changing. We have also captured thumbnails for those cuepoints such that we
  now have a nice list of thumbnails for each slide and an associated cuepoint in
  the video where the particular slide begins.

  Here comes the problem...due to the large size of the master video it is not
  practical for us to use the master video with our mediaElement player. We do
  need to transcode the master video to mp4 and ogv in order to get decent
  device/browser coverage.

  We do not seem to be able to find a suitable transcoding strategy to reduce the
  size of the video. We have played with numerous ffmpeg settings and were able to
  reduce the size but when we do so we compromise the ability to jump to specific
  cue points.

  It works well for browsers that do HTML5 video natively (Chrome and Firefox) but
  not for the flash fallback of mediaElement (IE7/IE8) which uses the mp4 file and
  seemingly is very tied to the number and frequency of key frames in the video in
  order to allow for clean seeking and skipping using the cue points.

  Seeing that we are talking about a video that has only slides (practically 90
  static images per presentation) and some sound we imagine it must be possible to
  transcode as such that the keyframes fall at the cue points or near the
  cuepoints, and that the size of the video could be drastically reduced while
  still allowing for smooth seeking and skipping.

• ffmpeg to convert mov to flv

  27 octobre 2014, par jeet

  I’m trying to convert a mov video to flv, but keep getting these errors below.
  There are 2 commands I used, both are below.

  ffmpeg -y -i video.mov -deinterlace -acodec copy -r 25 -qmin 3 -qmax 6 video.flv
  
  
  
  
  
  FFmpeg version SVN-r16573, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
  configuration: --extra-cflags=-fno-common --enable-memalign-hack --enable-pthreads --enable-libmp3lame --enable-libxvid --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libfaac --enable-libgsm --enable-libx264 --enable-libschroedinger --enable-avisynth --enable-swscale --enable-gpl
  
  libavutil     49.12. 0 / 49.12. 0
  
  libavcodec    52.10. 0 / 52.10. 0
  
  libavformat   52.23. 1 / 52.23. 1
  
  libavdevice   52. 1. 0 / 52. 1. 0
  
  libswscale     0. 6. 1 /  0. 6. 1
  
  built on Jan 13 2009 02:57:09, gcc: 4.2.4
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid\video.mov':
  
  Duration: 00:03:16.00, start: 0.000000, bitrate: 398 kb/s
  
  Stream #0.0(eng): Video: mpeg4, yuv420p, 800x600 [PAR 1:1 DAR 4:3], 30.00 tb(r)
  
  Stream #0.1(eng): Audio: pcm_u8, 8000 Hz, mono, s16, 64 kb/s
  
  Output #0, flv, to 'vid\video.flv':
  
  Stream #0.0(eng): Video: flv, yuv420p, 800x600 [PAR 1:1 DAR 4:3], q=3-6, 200 kb/s, 25.00 tb(c)
  
  Stream #0.1(eng): Audio: pcm_u8, 8000 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
  Stream #0.0 -> #0.0
  
  Stream #0.1 -> #0.1
  
  [NULL @ 0x1714390]codec not compatible with flv
  
  Could not write header for output file #0 (incorrect codec parameters ?)

  Second command :

  ffmpeg -y -i video.mov -deinterlace -ar 44100 -r 25 -qmin 3 -qmax 6 video.flv

  Audio resampler only works with 16 bits per sample, patch welcome.

  With a newer version of ffmpeg :

  ffmpeg version N-49610-gc2dd5a1 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Feb  5 2013 13:20:59 with gcc 4.7.2 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 17.101 / 52. 17.101
  
    libavcodec     54. 91.100 / 54. 91.100
  
    libavformat    54. 61.104 / 54. 61.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 35.101 /  3. 35.101
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid\video.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      creation_time   : 1970-01-01 00:00:00
  
    Duration: 00:02:50.39, start: 0.000000, bitrate: 370 kb/s
  
      Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1366x768 [SAR 1:1 DAR 683:384], 308 kb/s, 11.50 fps, 11.50 tbr, 23 tbn, 23 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : DataHandler
  
      Stream #0:1(eng): Audio: pcm_u8 (raw  / 0x20776172), 8000 Hz, mono, u8, 64 kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : DataHandler
  
  [flv @ 026347a0] FLV does not support sample rate 8000, choose from (44100, 22050, 11025)
  
  Output #0, flv, to 'vid\video.flv':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
  compatible_brands: qt  
  
      encoder         : Lavf54.61.104
  
      Stream #0:0(eng): Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 1366x768 [SAR 1:1 DAR 683:384], q=2-31, 200 kb/s, 1k tbn, 11.50 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : DataHandler
  
      Stream #0:1(eng): Audio: mp3 ([2][0][0][0] / 0x0002), 8000 Hz, mono, s16p
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : DataHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 -> flv)
  
    Stream #0:1 -> #0:1 (pcm_u8 -> libmp3lame)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input

  1 more thing please :
  If I use this newer version of ffmpeg to create a video with the below command, I get a video with a very hazy display.
  It’s like a few black dots on a blank screen :

  ffmpeg -i img%d.png -i audio.wav -acodec copy output.mov

  what could be the reason for this display ?