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• Get correct framerate from ffmpeg

  20 septembre 2015, par user3249421

  Good day,

  I have a problem. I need get correct framerate from ffmpeg libs..

  I tried use

  pFormatCtx->streams[videoStream]->avg_frame_rate.num

  return of avg_frame_rate is 2997. But when I dumped meta info, I got :

  Input #0, avi, from '/test.avi':
  
    Metadata:
  
      encoder         : MEncoder SVN-r33883(20110719-gcc4.5.2)
  
    Duration: 00:49:47.70, start: 0.000000, bitrate: 1294 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 856x480 [SAR 1:1 DAR 107:60], 1090 kb/s, SAR 491520:492521 DAR 8192:4603, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 192 kb/s
  
  2015-09-20 15:47:02.377 TV3[21607:769601] ready to start audio

  sample rate is : 23.98fps. What value is correct and why are they different ?

• Getting video sped-up with FFmpeg to have the correct duration

  1er septembre 2015, par Vincent Tjeng

  I’ve been speeding up video using ffmpeg by following these instructions. For example, to speed up the video by 4 times, I run the following command :

  ffmpeg -i vid.MP4 -filter:v "setpts=0.25*PTS" vid_fast.MP4

  While the video is sped up by the indicated amount, the duration of the video (as indicated under its properties, and also when I play the video in VLC) remains the same as the original. For example, if vid.MP4 is initially 4 minutes, then vid_fast.MP4 is also 4 minutes, rather than being 1 minute long as expected. (The additional 3 minutes just consist of the video being frozen on the last frame.)

  This is a bit of a hassle, since I need to delete the additional 3 minutes that I’m not interested in. Is there any way to avoid this ?

  Here is a bit more information on the version of ffmpeg I’m using :

  ffmpeg version N-69060-gcd960c8 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Jan 14 2015 22:13:45 with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
  
  modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
  
  b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
  
  r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
  
  able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
  
   --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
  
  libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enab
  
  le-zlib
  
    libavutil      54. 16.100 / 54. 16.100
  
    libavcodec     56. 20.100 / 56. 20.100
  
    libavformat    56. 18.101 / 56. 18.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5.  7.101 /  5.  7.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Hyper fast Audio and Video encoder

• avformat/hls : correct comment for ensure_playlist()

  21 août 2015, par Ganesh Ajjanagadde

  avformat/hls : correct comment for ensure_playlist()
  Comment was previously slightly incorrect.
  
  Also, it was placed in the wrong location.
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/hls.c