[FFmpeg-user] Concatenate multiple (<10) movies with xfade filter

[Paul B Mahol]

On 6/10/20, Kentaro Fukuchi <kentaro at fukuchi.org> wrote:
> Hi,
>
> Here I have more than 10 movies and want to concatenate into a single movie
> with cross-fade effect. I tried to use 'xfade' filter with many thanks to
> the authors of it, but I had no luck.
>
> What I did:
> ffmpeg -f concat -i movies.txt -filter_complex
> "xfade=transition=fade:duration=1" output.mp4
>
> What I received:
> ffmpeg version N-98092-g7ab375f574 Copyright (c) 2000-2020 the FFmpeg
> developers
>   built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
>   configuration:
>   libavutil      56. 52.100 / 56. 52.100
>   libavcodec     58. 92.100 / 58. 92.100
>   libavformat    58. 46.101 / 58. 46.101
>   libavdevice    58. 11.100 / 58. 11.100
>   libavfilter     7. 86.100 /  7. 86.100
>   libswscale      5.  8.100 /  5.  8.100
>   libswresample   3.  8.100 /  3.  8.100
> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55aa7f382000] Auto-inserting h264_mp4toannexb
> bitstream filter
> Input #0, concat, from 'movies.txt':
>   Duration: N/A, start: 0.000000, bitrate: 5521 kb/s
>     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
> 1280x720, 5521 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
>     Metadata:
>       handler_name    : VideoHandler
> Cannot find a matching stream for unlabeled input pad 1 on filter
> Parsed_xfade_0
>
> Additional note:
> The following worked as expected:
> ffmpeg -i movie1.mp4 -i movie2.mp4 -filter_complex
> xfade=transition=fade:duration=1 output.mp4
>
> Seems that the combination of filter_complex and concat format does not work
> as expected.
> How can I use filter_complex and xfade filter with concat format? Any
> suggestions are welcome.

xfade filter can not work with concat demuxer output.

>
> Kentaro
>
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