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• use anullsrc in ffmpeg command

  7 juin 2019, par S.T

  I have ffmpeg command that i want to add anullsrc filter to it

  I tried to add the command in different places there but there is always a problem. the command is taking 2 movies and merging them to one movie side by side. the audio is the 2 movies together.

  This is the command :

  ffmpeg -i loop2.mp4 -i loop1.mp4 -i logo.png -filter_complex "[0:v]pad=width=iw+20:height=ih+20:x=10:y=10:color=black[a] ;[1:v]pad=width=iw+20:height=ih+20:x=10:y=10:color=black[b] ;nullsrc=size=640x480[base] ;[a]setpts=PTS-STARTPTS, scale=320x480[left] ;[b]setpts=PTS-STARTPTS, scale=320x480[right] ;[base][left]overlay=shortest=1[tmp1] ;[tmp1][right] overlay=320:0[video] ;[video]overlay=5:5[videoandlogo] ;[0:a]apad [apa] ;[apa][1:a]amerge=inputs=2,pan=stereo|FL

  In the command i have the nullsrc for the video and i want to add also the anullsrc for the audio.
  Can some one help ? Thanks.

  I have a problem when doing this command with the right file (always the right, even if i switched the files), the audio is not synced with the video and i think its because i didn’t use the anullsrc (maybe i am wrong). it happens only on files that i concat them - took one video, and concat it a few times to itself with a different command - loop, and created a new file. the looped video is synced, only the merge is destroying the audio sync (on regular files without loop the sync is good after the merge).
  Thanks.

• Video not playing on all browsers (FFMPEG)

  12 février 2021, par Mithradantor

  For days I have been struggeling with ffmpeg (PHP).

  


  I have a website where users can upload video's. Obviously people use .mov, .mp4 and .mpeg created by various devices such as cameras, mobile telephones, tablets and many more devices. The problem I have is that those movies either work on Firefox or Chrome, but almost never on both. No clue why, I guess it has to do with codecs and browser support.

  


  I am using FFMpeg to turn them into webm files. This works 95% of the time. In all browsers I have a working video and the sound works too. But sometimes there is no sound at all.

  


  When I open the movie in a other browser (or Windows media player for example) I do hear sound. It is so random to in what browser or software it works or does not work.

  


  Does anyone know of a way to make sure that your movies work in every browsers i.e. Chrome, FireFox and Safari with both video and audio ? and if so, how can I transform them and into what format (codecs ?)

  


  I dont mind converting a movie into three different formats, as long as both video and audio works.

  


  I hope someone can give me some advice. I have tried many ways but none work cross-browser so far.

  


  An example of the code that I use :

  


  $video->save(new FFMpeg\Format\Video\WebM(), 'export-webm.webm');


  


  Does anyone know how I can make it work on every browser ?

  


  What I already tried is (amongst others) :

  


  using an original mp3 or mov and convert it into webm with this code :

  


  ffmpeg -i origin.mov -c:a libvorbis -strict -2 -c:v libvpx-vp9 output.webm

  


  Unfortunately in FireFox i have visual and audio but in Chrome I have nothing, just a blank screen.

  


• iFrameExtractor no ffmpeg with build_universal script

  15 août 2016, par AlecGamble

  I’m trying to follow this tutorial on how to extract the frames from an iphone video :

  http://www.codza.com/extracting-frames-from-movies-on-iphone#more-343

  It says to do the following :

  • open Terminal
  • clone the repository : git clone git://github.com/lajos/iFrameExtractor.git
  • go to the ffmpeg folder in the project : cd iFrameExtractor/ffmpeg
  • build the ffmpeg libraries : ./build_universal

  So there’s no ffmpeg folder in iFrameExtractor after cloning the repository so I went to the github page and it says to download the latest version of ffmpeg and move to to the ffmpeg folder (I presume it just means within iFrameExtractor) :

  • Download the latest ffmpeg (0.11.1 tested) :
    git clone git://source.ffmpeg.org/ffmpeg.git

  So I’ve done that but there’s no file or directory when I try to run ./build_universal and I can see that there isn’t.

  Any ideas what I’m doing wrong ?

  Alternatively I was also looking at just installing ffmpeg-ios and trying to extract the frames myself :

  https://github.com/kewlbear/FFmpeg-iOS-build-script

  and I’ve run the script so I’ve got that folder in my xcode project as well but I’m unsure on how to link it properly ?