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I am trying to use FFmpeg library in Android to reverse video. I can dump images from videos, but how can I reverse all images and make a new video?

I am using a library from here in my gradle. Library is compile 'com.github.hiteshsondhi88.libffmpeg:FFmpegAndroid:0.2.5'. I can use some of the commands but not all. I'm using this command to dump images from video:

-i /storage/emulated/0/ffvid/frameCount.mp4 -an -qscale 1 /storage/emulated/0/ffimg/revi%06d.jpg

I can't use the commands $ffmpeg , $sox and $cat

I have unsuccessfully tried following these suggestions:

What else can I try?

  • Do you mean $cat or cat? – mchid Feb 22 '16 at 5:57
  • cat command i don't know which perfect i am android developer but i need help to make video in severe. and command use time i can't abale to add prefix in command as like ffpmeg ,sox and cat. – Ravi Vaghela Feb 22 '16 at 6:00
  • 1
    It is discouraged to crosspost the same question to multiple Stack Exchange sites. – llogan Feb 22 '16 at 17:21
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    I'm voting to close this question as off-topic because this is a crosspost – Fabby Feb 23 '16 at 22:13
  • So are you running Ubuntu or Android then? And which version? – user364819 Feb 24 '16 at 11:15
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It looks like it runs ffmpeg and so instead of this:

ffmpeg -i inputfile.mp4 -vf reverse reversed.mp4

and this:

ffmpeg -i inputfile.mp4 -vf reverse -af areverse reversed.mp4

Run this instead:

-i inputfile.mp4 -vf reverse reversed.mp4

and this:

-i inputfile.mp4 -vf reverse -af areverse reversed.mp4

https://video.stackexchange.com/a/17739

Thanks LordNeckbeard!

It looks like this only works for ffmpeg commands and so commands like cat won't work.

I didn't look at it too close but it looks like if you try to run cat you would really be running ffmpeg cat which does not exist.

You see, if you run -i input.mkv -an -qscale 1 %06d.jpg from a terminal, this does nothing but if you run ffmpeg -i input.mkv -an -qscale 1 %06d.jpg it does. This indicates that this application runs ffmpeg and allows you to add the option -i input.mkv -an -qscale 1 %06d.jpg to the ffmpeg command.

  • yes you are right but i need to use that that for want i can do via above link that i give in my question – Ravi Vaghela Feb 22 '16 at 6:04
  • @RaviVGHL Okay, I see. It looks like you are running the ffmpeg command and everything you run is only run after ffmpeg so commands like cat won't work. If you want to run ffmpeg -i input.mkv -an -qscale 1 %06d.jpg you should run this instead -i input.mkv -an -qscale 1 %06d.jpg – mchid Feb 22 '16 at 6:08
  • cat command not works as like that – Ravi Vaghela Feb 22 '16 at 6:09
  • @RaviVGHL Well, I didn't look at it too close but it looks like if you try to run cat you would really be running ffmpeg cat which does not exist. You see, if you run -i input.mkv -an -qscale 1 %06d.jpg from a terminal, this does nothing but if you run ffmpeg -i input.mkv -an -qscale 1 %06d.jpg it does. This indicates that this application runs ffmpeg and allows you to add the option -i input.mkv -an -qscale 1 %06d.jpg to the ffmpeg command. – mchid Feb 22 '16 at 6:13
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    @mchid See this duplicate crosspost for one method (I've never tried it however). – llogan Feb 23 '16 at 16:54

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