使用 mobile-ffmpeg android 在两次视频之间叠加图像

Question

I am trying to add image overlay on video using "mobile-ffmpeg-full-gpl:4.4" library but faced following error:

Error when evaluating the expression 'between(t' for enable' error.

I have a class that create overlay filter for adding image:

class ImageFilter {

static String getFilter(String input, String output, ArrayList<ExtraTL> listImage, int order){
    String filter="";
    for (int i=0; i<listImage.size(); i++){
        ImageHolder image = listImage.get(i).imageHolder;
        int index = i+order;
        String in = i==0?input:"[out"+index+"]";
        String out = i==listImage.size()-1?output:"[out"+(index+1)+"];";
        filter += prepareImage(image, index);
        filter += addImage(in, out, image, index);
    }
    return filter;
}

private static String prepareImage(ImageHolder image, int index){
    return "["+index+":v]scale="+image.width+":"
                +image.height+",rotate="+image.rotate+":c=none:ow=rotw("+image.rotate
                +"):oh=roth("+image.rotate+")[ov"+index+"];";
}

private static String addImage(String input, String output, ImageHolder image, int index){
    return input+"[ov"+index+"]overlay="+image.x
            +":"+image.y+":enable='between(t,"+image.startInTimeLineSec +","
            +image.endInTimeLineSec +")'"+output;
}`

FFMPEG Command used:

-loop 1 -i /storage/emulated/0/OP_Video_Editor/.temp/background.png -ss 0.0 -t 21.18 -i /storage/emulated/0/OP_Video_Editor/.temp/1614097633623.mp4 -i /storage/emulated/0/OP_Video_Editor/.resource/sticker_i02.png -filter_complex [1:v]crop=640:360:0:0[crop];[crop]scale=1280:720[v_scale];color=black:1280x720,fps=30[bgr0];[bgr0][0:v]overlay[bgr];[bgr][v_scale]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:shortest=1[v1];[1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.0[a1];[v1][a1]concat=n=1:v=1:a=1[v][a];[a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.0[a0];[a0]amix=inputs=1:duration=longest:dropout_transition=1[outAudio];[2:v]scale=333:333,rotate=-0.0:c=none:ow=rotw(-0.0):oh=roth(-0.0)[ov2];[v][ov2]overlay=333.33334:333.33334:enable='between(t,0.0,10.0)'[inText] -map [inText] -map [outAudio] -format yuva420p -preset ultrafast -video_track_timescale 90k -b:v 2000k -c:v libx264 -bufsize 64k -c:a aac -bsf aac_adtstoasc -strict -2 -y /storage/emulated/0/videoExport/videoplayback_22_21_28_18_44_10.mp4 

Also my log when I run program is:

'2021-03-03 17:26:32.165 11664-11830/com.hecorat.azplugin2 E/mobile-ffmpeg: [overlay @ 0xdc5f3b80] [Eval @ 0xc5bd6b70] Missing ")" or too many args in "between(t"

2021-03-03 17:26:32.167 11664-11830/com.hecorat.azplugin2 E/mobile-ffmpeg: [overlay @ 0xdc5f3b80] Error when evaluating the expression "between(t" for enable'

How can I resolve this error?

Answer 1

Try inserting a ` before the comma in between(t,0.0,10.0), otherwise the comma will be interpreted as a filter separator.

With guidance @slhck; I replace

enable='between(t,"+image.startInTimeLineSec +","
        +image.endInTimeLineSec +")'

with

enable='between(t\\,"+image.startInTimeLineSec +"\\,"
        +image.endInTimeLineSec +")'

and it works.