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• Syncronize keytimes of audio and video by adding automatic pauses

  2 février 2020, par Alexander Rodríguez

  I would to ask for help regarding this matter. I am a beginner in the use of FMMPEG and I want to know if it is possible to perform the algorithm to edit a video file with an audio file.

  Let’s suppose that you have an Audio and Video clips.
  The Audio has a keytimes on 0s, 5s and 11s and the Video has a keytimes on 0s, 3s, and 16s. This keytimes are in the following TXT file :

  Audio   Video
  
  0s      0s        Audio and video playback starts.
  
  5s      3s        (1)
  
  11s     16s       (2)

  The algorithm takes in the input an Audio clip, Video clip and the TXT file, I want (automaticaly) compute pauses and sync clips according to the following explanation :

  (1) During the first 5 seconds of audio, the first 3 seconds of video are played. Since the video lasts less than the audio, a 2 second pause should be inserted after the 3rd second of video (to match the 5 second video’s length).

  (2) From the second 5 to second 11 the audio is played, from second 3 to 16 the video will be played at the same time. Since the audio´s length will be 6 seconds and the video’s length will be 13 seconds, a 7 second pause should be added to the video.

  I have read and searched a lot about this, but I haven’t found anything that helps me to start this algorithm. Could you help me, please ?

  I apologize in advance if it is a duplicated ask.

• ffmpeg : create interlaced output from progrssive input

  6 février 2012, par user1190908

  I have a 720p60 (54.94 to be exact) clip that I would like to scale down and output in 540i30 (27.97 to be exact).

  Here is my command line :

  ffmpeg.exe -i clip720p60.m2t -ss 90 -t 30 -vcodec libxvid -s 960x540 -b 1000k -r 29.97 -acodec libmp3lame -ar 22050 -ab 64k -f avi clip540i30.avi
  
  ...
  
  Input #0, mpegts, from 'clip720p60.m2t':
  
    Duration: 01:53:55.76, start: 0.196678, bitrate: 17250 kb/s
  
    Program 1
  
      Stream #0.0[0x1011]: Video: h264, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], 59.94 tb(r)
  
      Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 384 kb/s
  
  Output #0, avi, to 'clip540i30.avi':
  
      Stream #0.0: Video: libxvid, yuv420p, 960x540 [PAR 1:1 DAR 16:9], q=2-31, 1000 kb/s, 29.97 tb(c)
  
      Stream #0.1: Audio: libmp3lame, 22050 Hz, stereo, s16, 64 kb/s
  
  ...

  The first options indicates to encode 30s at 90s past the start.

  Whatever options I tried up to now always end up with a video stream of 60s and an audio stream of 30s in the output clip.

  Can any one help me ?

• How to edit video (cut some scenes) without increasing the video's size

  18 février 2016, par 123iamking

  [Introduction]

  I have a video : Input.mp4 - length : 29 min 6 sec - size : 120 MB

  I use Microsoft Movie Maker 2012 (Movie Maker is included in the Windows Essentials 2012 program suite), to cut some boring scenes and keep the cool scenes and I get the video : Output.mp4 - length : 15 min 22 sec - size : 155 MB.

  And it’s take a long time to create the Output.mp4 and the size is ridiculously increased. I can’t use this kind of software anymore, I need to create a new software to serve my purpose.

  [Question]

  Is there anyway with C# .Net to simply cut and merge video without increasing the video’s size and have to be fast ?

  [What I have tried]

  I intend to use ffmpeg to cut the clip and merge the clip and I found something about cut video here , but the console said something about "Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future." - should I still use this ?

  Should I use ffmpeg or there’s better way to do this.