[FFmpeg-user] emerge has unconnected output? Works on FFMPEG 4, not 3

[KarlMessner]

Good morning folks,

Any idea what I'm doing wrong here:

/usr/local/bin/ffmpeg -report -i videos/intro720.mp4 -i videos/raw.mp4 -i
videos/outro720.mp4 -i videos/music.mp3 -filter_complex " \
[0]
scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1[v0];
\
[1]
scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1[v1];
\
[2]
scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1[v2];
\
[3:a]volume=.015[a0]; \
*[1:a][a0]amerge[amix]; \
*[v0][0:a:0] [v1][aMix] [v2][2:a:0] concat=n=3:v=1:a=1[v][a]" -map "[v]"
-map "[a]" -f mp4 videos/out1606134367mp4 2>&1


Here's the report: 

ffmpeg started on 2020-11-23 at 07:26:07
Report written to "ffmpeg-20201123-072607.log"
ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
  configuration: --enable-gpl --enable-nonfree --enable-shared
--enable-libmp3lame --enable-libx264 --enable-libfdk-aac --enable-libtheora
--enable-libvorbis --enable-libxvid --enable-libfreetype --enable-libvpx
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/intro720.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.12.100
    episode_sort    : 0
    season_number   : 0
    media_type      : 0
    hd_video        : 0
  Duration: 00:00:08.34, start: 0.023220, bitrate: 331 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 16:15 DAR 256:135], 269 kb/s, 30 fps, 30 tbr, 15360 tbn, 60
tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 53 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/raw.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2020-11-18 19:47:11
    com.android.version: 10
    com.android.manufacturer: Google
    com.android.model: Pixel XL
  Duration: 00:01:15.98, start: 0.000000, bitrate: 17097 kb/s
    Stream #1:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc,
smpte170m), 1920x1080, 16997 kb/s, SAR 1:1 DAR 16:9, 29.91 fps, 29.97 tbr,
90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2020-11-18 19:47:11
      handler_name    : VideoHandle
    Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono,
fltp, 95 kb/s (default)
    Metadata:
      creation_time   : 2020-11-18 19:47:11
      handler_name    : SoundHandle
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/outro720.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.12.100
    episode_sort    : 0
    season_number   : 0
    media_type      : 0
    hd_video        : 0
  Duration: 00:00:09.15, start: 0.023220, bitrate: 208 kb/s
    Stream #2:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 198 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
(default)
    Metadata:
      handler_name    : VideoHandler
    Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[mp3 @ 0x10c5e40] Skipping 0 bytes of junk at 138.
[mp3 @ 0x10c5e40] Estimating duration from bitrate, this may be inaccurate
Input #3, mp3, from 'videos/music.mp3':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6mp41
    encoder         : Lavf57.19.100
  Duration: 00:01:56.69, start: 0.000000, bitrate: 192 kb/s
    Stream #3:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
*Filter amerge has a unconnected output*



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