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• How to convert a Video to a Slideshow with synced audio ? [closed]

  25 mai 2013, par Henry Mazza

  I want a simple way to convert a Ted Talk Presentation to a SlideShow + (synced)Audio format so I can listen to it in my car. I don't want to lose most of the visuals as it does in the audio format and also want to reduce the storage/cell data needs of the video format.

  So far I already extracted the key scenes with timing and the audio, now I must glue this together in a synced fashion.

  Possible ways I found but couldn't make work :

  • MP4Box to make a .m4b (audiobook/enhanced podcast) with mp4chap to set each image as a chapter image (but I could find proper documentation on how to do this)
  • FFMPEG to make a flat movie with the images (but I couldn't make each image stay for a random period of time)

  Ultimately I will automate this process in my VPS and make my private podcast server, so no fancy tools that don't work in Linux, please.

  EDIT : actually the Podcast is a lousy idea, the artwork must be in a square aspect ratio and has great compatibility problems with varius players. Still studing the Book format.

• FFMPEG Segmenting skips when m3u8 changes file

  25 septembre 2012, par user792164

  I am attempting to segment a large video file in to segments. When streamed (even locally) by opening the m3u8 file it will jump forward in time by some period of time less than 1 second.

  The following commands are executed :

  First mp4 —> ts :

  ffmpeg -i input_file.mp4 -bsf:v h264_mp4toannexb -acodec libfaac -vcodec libx264 -f mpegts -threads 0 output.ts

  Then I split using :

  ffmpeg -i output.ts -vcodec copy -acodec copy -map 0 -f segment -segment_time 30 -segment_list output.m3u8 -segment_list_type m3u8 -segment_format mpegts output%03d.ts 

  Note : Changing segment time has no effect on issue.

  Generated manifest :

  #EXTM3U
  
  #EXT-X-VERSION:4
  
  #EXTINF:30.947578,
  
  output000.ts
  
  #EXTINF:30.155111,
  
  output001.ts
  
  ...
  
  #EXTINF:24.023989,
  
  output082.ts
  
  #EXT-X-TARGETDURATION:37
  
  #EXT-X-ENDLIST

  ---

  Meta Data :

  $> ffmpeg -version
  
  ffmpeg version git-2012-08-19-a93c221
  
  built on Aug 19 2012 13:18:58 with gcc 4.4.5 (Debian 4.4.5-8)
  
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib/ --mandir=/usr/share/man --extra-cflags='-O3 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions \ -fstack-protector --param=ssp-buffer-size=4 -mtune=generic' --enable-gpl --enable-shared --enable-nonfree --enable-version3 --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-pthreads --enable-libxvid --enable-postproc --enable-libgsm --enable-libspeex --enable-avfilter --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-decoder=libschroedinger --enable-libopenjpeg --disable-ffplay --disable-ffserver
  
  libavutil      51. 70.100 / 51. 70.100
  
  libavcodec     54. 53.100 / 54. 53.100
  
  libavformat    54. 25.104 / 54. 25.104
  
  libavdevice    54.  2.100 / 54.  2.100
  
  libavfilter     3. 11.101 /  3. 11.101
  
  libswscale      2.  1.101 /  2.  1.101
  
  libswresample   0. 15.100 /  0. 15.100
  
  libpostproc    52.  0.100 / 52.  0.100

  -

  $> ffprobe input_file.mp4
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_file.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 1
  
  compatible_brands: isom
  
  creation_time   : 2011-09-08 11:43:25
  
  Duration: 00:41:31.00, start: 0.000000, bitrate: 1146 kb/s
  
  Stream #0.0(und): Video: h264 (High), yuv420p, 720x404 [PAR 1:1 DAR 180:101], 1015 kb/s,    23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
  
  Metadata:
  
    creation_time   : 2011-09-08 11:43:25
  
  Stream #0.1(und): Audio: aac, 48000 Hz, stereo, s16, 124 kb/s
  
  Metadata:
  
    creation_time   : 2011-09-08 11:43:25

  -

  $> ffprobe output_file.ts
  
  Input #0, mpegts, from 'output_file.ts':
  
  Duration: 00:41:30.98, start: 1.400000, bitrate: 807 kb/s
  
  Program 1 
  
  Metadata:
  
    service_name    : Service01
  
    service_provider: FFmpeg
  
  Stream #0.0[0x100]: Video: h264 (High), yuv420p, 720x404 [PAR 1:1 DAR 180:101], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
  
  Stream #0.1[0x101](und): Audio: aac, 48000 Hz, stereo, s16, 141 kb/

  ---

  Is it possible to remove this jump, if so, what encoding parameters or incorrect assumptions have I made ? Thanks.

• How to create slideshow from images with ffmpeg ?

  7 novembre 2012, par Arsen Zahray

  I want to create a slideshow from images, where each image would be displayed for some period of time (several seconds).

  How do I do that ?

  Currently I was trying to encode short clips with ffmpeg and then stitch those together with mencoder :

          foreach (var item in filePattern)
  
          {
  
              var otpt = item.Key + ".mpg";
  
              Process.Start("ffmpeg",
  
                  string.Format("-y -r 25 -f image2 -vframes 75 -i {0} {1}", item.Value, otpt)//-loop 1
  
                  ).WaitForExit();
  
          }

  ffmpeg -y -r 25 -f image2 -vframes 75 -i input-pattern output does create a file with 1 frame in it, while ffmpeg -y -loop 1 -r 25 -f image2 -vframes 75 -i input-pattern output on windows never finishes (needs ctrl+c to stop) ; the second command worked on linux for me.

  I need to make this work primary on Windows. Which params should I use ?