Recherche avancée

Sur d’autres sites (10046)

• Revision ccef8842d2 : Allow full coeff probability model and cost update This commit moves the simpli

  13 août 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_speed_features.c

  
  
  Allow full coeff probability model and cost update

  This commit moves the simplified coefficient probability model
  and costing update to speed 4, and turns on chessboard pattern
  mode search for sub 720p sequences. The overall coding performance
  of speed 3 is improved :
  derf 0.889%
  stdhd 1.744%

  The speed 3 runtime for test sequences are improved :
  bus cif at 1000 kbps 9823 ms -> 9642 ms
  pedestrian 1080p 2000 kbps 189559 ms -> 183284 ms

  Change-Id : Iecbc7496a68f31fd49fb09f8dfd97c028d675a5d

• FFMpeg generating screenshots drop frames

  6 octobre 2011, par Morgan

  I'm using FFMpeg to extract frames from a video file, and for most videos it works flawlessly. But certain videos it seems to have to seek to the position that I want to take the screenshot from, and drops all the frames on the way there taking quite a while if the position i'm generating a screenshot from is near the end of the video. Here is the command I'm using to extract my screenshot.

  ffmpeg -ss 60 -i input.mkv -vframes 1 -f image2 -an -r 1/5 output.jpg

  and the output I receive

  ffmpeg version 0.8.3, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Sep 20 2011 00:46:47 with clang 2.1 (tags/Apple/clang-163.7.1)
  
    configuration: --prefix=/Users/Morgan/Downloads/installed/ffmpeg --extra-libs=/Users/Morgan/Downloads/installed/lib/libfaac.a --enable-gpl --extra-cflags=-I/Users/Morgan/Downloads/installed/include --disable-ffplay --disable-ffserver --disable-shared --disable-debug --extra-ldflags=-L/Users/Morgan/Downloads/installed/lib --enable-libmp3lame --enable-libfaac --enable-libx264 --enable-nonfree --cc=clang
  
    libavutil    51.  9. 1 / 51.  9. 1
  
    libavcodec   53.  7. 0 / 53.  7. 0
  
    libavformat  53.  4. 0 / 53.  4. 0
  
    libavdevice  53.  1. 1 / 53.  1. 1
  
    libavfilter   2. 23. 0 /  2. 23. 0
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [matroska,webm @ 0x7f9dd3007c00] Estimating duration from bitrate, this may be inaccurate
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 47.95 (500000/10427) -> 23.98 (24000/1001)
  
  Input #0, matroska,webm, from 'input.mkv':
  
    Duration: 01:01:36.16, start: 0.000000, bitrate: 576 kb/s
  
      Stream #0.0(eng): Video: h264 (High), yuv420p, 1280x720, PAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
  
      Metadata:
  
        title           : Input Video
  
      Stream #0.1(eng): Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s (default)
  
      Metadata:
  
        title           : English Dolby Digital 5.1 AC3
  
      Stream #0.2(eng): Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
  
      Metadata:
  
        title           : Commentary
  
      Stream #0.3(eng): Subtitle: [0][0][0][0] / 0x0000 (default)
  
      Metadata:
  
        title           : English
  
  Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
  
  [buffer @ 0x106c10c00] w:1280 h:720 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
  
  [buffersink @ 0x106c10e40] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x106c11140] w:1280 h:720 fmt:yuv420p -> w:1280 h:720 fmt:yuvj420p flags:0x4
  
  Output #0, image2, to 'output.jpg':
  
    Metadata:
  
      encoder         : Lavf53.4.0
  
      Stream #0.0(eng): Video: mjpeg, yuvj420p, 1280x720 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 0.20 tbc (default)
  
      Metadata:
  
        title           : Input Video
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=  0 q=0.0 Lsize=      -0kB time=00:00:00.00 bitrate=   0.0kbits/s dup=0 drop=275    
  
  video:0kB audio:0kB global headers:0kB muxing overhead -inf%

• Convert SWF file to FLV with FFMPEG & getting error "could not find codec parameters"

  30 mars 2013, par Ritesh

  Hi I am trying to convert SWF file to FLV, but i am getting same eror

  C:\Users\Administrator>C:/ffmpeg/ffmpeg.exe -i C:/xampplite/htdocs/ffmpeg/1.swf \
  
   C:/xampplite/htdocs/ffmpeg/file1.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 
  
  C:/xampplite/htdocs/ffmpeg/1.swf: could not find codec parameters

  Please solve this problem, what i am doing wrong ??