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• Trim video in Android using ffmpeg, audio and video not in sync

  8 novembre 2017, par Nidhin Radh

  I’m creating an Android application which process video files and I’ve used VideoKit library (https://github.com/inFullMobile/videokit-ffmpeg-android) to integrate ffmpeg with the application.
  I used the following snippet to trim a video,

                      Command command= videoKit.createCommand()
  
                                      .overwriteOutput()
  
                                      .inputPath(ipfile.getAbsolutePath())
  
                                      .outputPath(opfile.getAbsolutePath())
  
                                      .customCommand("-ss 10 -t 30 -vcodec "+ 
  
                                       "copy -acodec copy -async 1")
  
                                      .copyVideoCodec()
  
                                      .experimentalFlag()
  
                                      .build();
  
                              command.execute();

  Sometimes the output seems to be okay, but sometimes the video and audio are not in sync, i.e. video ends before audio. Most of the time this happens with videos downloaded from YouTube.
  Can someone give me an idea to trim videos in android without any problems ?

• Find video resolution and video duration of remote mediafile

  22 février 2012, par osgx

  I want to write an program which can find some metainformation of mediafile. I'm interested in popular video formats, such as avi, mkv, mp4, mov (may be other popular too). I want basically to get :

  • Video size (720, 1080, 360 etc)
  • Total runtime of video (may be not very exact)
  • Number of audio streams
  • Name of video codec
  • Name of audio codec

  There is already the mediainfo, but in my program I want to get information about remote file, which may be accessed via ftp, http, samba ; or even torrent (there are some torrent solutions, which allows to read not-yet downloaded file).

  MediaInfo library have no support of samba (smb ://) and mkv format (for runtime).

  Also, I want to know, how much data should be downloaded to get this information. I want not to download full videofile because I have no enough disk space.

  Is this information in the first 1 or 10 or 100 KiloBytes of the file ? Is it at predictable offset if I know the container name and total file size ?

  PS : Platform is Linux, Language is C/C++

• How to reduce the file size during conversion of video from any video to mp4 using ffmpeg &mp4box in PHPmotion ?

  6 mars 2016, par Balaji Kandasamy

  I am using ffmpeg & mp4box in my PHPmotion site to convert videos to mp4 format. When I convert a 50MB video to mp4, the file size remain same. So Its affecting the video streaming in my site. So I want to reduce the file size of the video in conversion. This is my code example, that I’ve used the site for converting m4v videos in PHPmotion.

  $ffmpeg_cmd2_2 = "$config[path_to_ffmpeg] -i $raw_video_path -vcodec libx264 -vpre veryfast -crf 15 -b 5120000 -threads 0 -acodec libfaac -ac 2 -ab 128k -ar 44100 -f mp4 $new_flv_1";
  
  $mp4box_cmd = "$mp4box_path -add $new_flv_1 $new_flv_2" 

  When I use this command,it converts the m4v file to mp4 format, but the filesize doesn’t change. What command I should use in this to reduce the filesize during video conversion in PHPmotion ? Can anyone write a ffmpeg command to reduce the filesize during conversion ?