How to write ffmpeg commands in android

Question

I am using BravoBit dependency to execute ffmpeg commands in Android. Below is the dependency

 implementation 'nl.bravobit:android-ffmpeg:1.1.5'

It takes a String[] commands to execute the ffmpeg commands. But I am not able to figure out how to pass complex commands in the array format. I keep getting invalid arguments error whenever I try to execute my commands. Below is one of the commands I am trying to use.

String[] cmd = new String[]{"-i", uri, "-i",overlayUri , "-filter_complex","[0:v]setpts=PTS-STARTPTS", "scale=1920x1080[top]","[1:v]loop=-1:size=750","setpts=N/FRAME_RATE/TB","scale=1920x1080","format=yuva420p", "colorchannelmixer=aa=0.5[bottom]" , "[top][bottom]overlay=shortest=1, format=yuv420p", outputPath};

Here uri,overlayUri are the input and overlay file path and outputPath is the path for output file.

The error that I got

[NULL @ 0xf6d44e00] Unable to find a suitable output format for '[1:v]loop=-1:size=750' [1:v]loop=-1:size=750: Invalid argument

All filter spec after "-filter_complex" and before outputPath goes as a single string. Don't forget the ; separators where necessary — Alex Cohn
– Alex Cohn, Commented Aug 17, 2018 at 6:38
@AlexCohn and how to define codecs ?Will they be separate from filer_complex or with them. — Vivek Mishra
– Vivek Mishra, Commented Aug 17, 2018 at 6:49
Which codecs? With very few exceptions, your array will look like ["-xxx", "yyy", "-abc", "def", … , outputPath] — Alex Cohn
– Alex Cohn, Commented Aug 17, 2018 at 11:05
I got it figured now. Thanks for your previous comments. But for codecs I meant like libvorbis etc and also I am not able to figure out how to use -map commands — Vivek Mishra
– Vivek Mishra, Commented Aug 17, 2018 at 11:08

Vivek Mishra · Accepted Answer · 2018-11-16 09:35:21Z

After lot of hit and try methods I got it working with the below format.

String[] cmd4 = new String[]{"-i", uri,"-f" ,"lavfi", "-i","movie="+overlayUri+":loop=200,setpts=N/FRAME_RATE/TB","-filter_complex","[1:v][0:v]scale2ref[ua][b];[ua]setsar=1,format=yuva444p,colorchannelmixer=aa=0.5[u];[b][u]overlay", outputPath};

My aim with the above command was to overlay a video over another video and loop the overlay video to the length of the input video. What I understood here is that anything starting with - is a sub command and should be a index in the command array.

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