[FFmpeg-devel] loop Video Filter Not Looping

[Paul B Mahol]

On 5/8/19, TalkVideo at talkvideo.net <TalkVideo at talkvideo.net> wrote:
> The commands below all produce an output with a smaller video overlaid in
> the upper left. But, it will not loop. It plays
> the overlay until its end, and stays on the last frame.
>
> The overlay must of course be shorter in time than the main video, but in an
> RTMP stream, I would like to bring overlays in and out, in order to play
> clips during the stream. When the clip is done, It should disappear.
>

Your loop filter incarnation is invalid. Size must be size of looped
frames and not unset.

> The Warning I get is:
> "[Parsed_movie_1 @ 0x3ccb380] EOF timestamp not reliable"
>
> The overlay video was produced with the following command:
>
> ffmpeg -y -ss 23 -i <some-video-file> -qmin 1 -qmax 2 -s 640x360 -t 2
> overlay.flv
>
>
> My FFMPEG Is:
> ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers
>   built with gcc 7 (GCC)
>   configuration: --extra-libs=-lpthread --extra-libs=-lm --enable-gpl
> --enable-libfdk_aac --enable-libfreetype --enable-libmp3lame
> --enable-libx264 --enable-nonfree --enable-fontconfig --enable-libfribidi
>   libavutil      56. 22.100 / 56. 22.100
>   libavcodec     58. 35.100 / 58. 35.100
>   libavformat    58. 20.100 / 58. 20.100
>   libavdevice    58.  5.100 / 58.  5.100
>   libavfilter     7. 40.101 /  7. 40.101
>   libswscale      5.  3.100 /  5.  3.100
>   libswresample   3.  3.100 /  3.  3.100
>   libpostproc    55.  3.100 / 55.  3.100
>
> Thanks.
>
>
> /usr/local/bin/ffmpeg -re -y -i Input.flv -c:v libx264 -x264-params
> "nal-hrd=vbr" -filter_complex "copy[in2];
> movie=overlay.flv,loop=0,setpts=N/FRAME_RATE/TB,scale=640:360[tmp2];
> [in2][tmp2]overlay=70:100:shortest=0" -qmin 1 -qmax 15  -c:a aac -b:a 128k
> -b:v 8M -maxrate 80M -bufsize 80M -g 15  -preset ultrafast -s 1920x1080  -r
> 30  -pix_fmt yuv420p -f mp4 -t 20 out.mp4
>
> /usr/local/bin/ffmpeg -re -y -i Input.flv -c:v libx264 -x264-params
> "nal-hrd=vbr" -filter_complex "copy[in2];
> movie=overlay.flv,loop=0,setpts=N/FRAME_RATE/TB,scale=640:360[tmp2];
> [tmp2]loop=0[tmp3];  [in2][tmp3]overlay=70:100:shortest=0" -qmin 1 -qmax 15
> -c:a aac -b:a 128k -b:v 8M -maxrate 80M -bufsize 80M -g 15  -preset
> ultrafast -s 1920x1080  -r 30  -pix_fmt yuv420p -f mp4 -t 20 out.mp4
>
>  /usr/local/bin/ffmpeg -re -y -i Input.flv -c:v libx264 -x264-params
> "nal-hrd=vbr" -filter_complex "copy[in2];
> movie=overlay.flv,setpts=N/FRAME_RATE/TB,scale=640:360[tmp2];
> [tmp2]loop=0[tmp3];  [in2][tmp3]overlay=70:100:shortest=0" -qmin 1 -qmax 15
> -c:a aac -b:a 128k -b:v 8M -maxrate 80M -bufsize 80M -g 15  -preset
> ultrafast -s 1920x1080  -r 30  -pix_fmt yuv420p -f mp4 -t 20 out.mp4
>
> /usr/local/bin/ffmpeg -re -y -i Input.flv -c:v libx264 -x264-params
> "nal-hrd=vbr" -filter_complex "copy[in2];
> movie=overlay.flv,setpts=N/FRAME_RATE/TB,scale=640:360[tmp2];
> [tmp2]loop=0[tmp3];  [in2][tmp3]overlay=70:100:shortest=0" -qmin 1 -qmax 15
> -c:a aac -b:a 128k -b:v 8M -maxrate 80M -bufsize 80M -g 15  -preset
> ultrafast -s 1920x1080  -r 30 -f flv
> rtmp://a.rtmp.youtube.com/live2/<stream-key>
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