ffmpeg объединяет аудио с видео и меньшей громкостью

Я пытаюсь объединить аудио файл mp3 с файлом видео mp4. Я хочу, чтобы громкость аудиофайла немного уменьшилась, чтобы это была фоновая музыка для видеоклипа.

Вот так выглядит мой код (я пытался адаптировать предыдущий код, объединяя 2 mp3) -

ffmpeg \ -i output.mp4 \  -i music.mp3 \  -filter_complex "[0:a]volume=0.15[A];[1:a][A]amerge[out]" \ -map [out] -y output-final.mp4 2>&1 

РЕДАКТИРОВАТЬ

Кажется, есть проблема на iphone при кодировании MP4-видео с использованием filter_complex с Amerge.

Консольный вывод -

ffmpeg version N-90767-g768c077-syslint Copyright (c) 2000-2018 the FFmpeg developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16) configuration: --prefix=/usr/local/cpffmpeg --enable-shared --enable-nonfree --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --extra-cflags=-I/usr/local/cpffmpeg/include --extra-ldflags=-L/usr/local/cpffmpeg/lib --enable-version3 --extra-version=syslint libavutil 56. 15.100 / 56. 15.100 libavcodec 58. 19.100 / 58. 19.100 libavformat 58. 13.100 / 58. 13.100 libavdevice 58. 4.100 / 58. 4.100 libavfilter 7. 18.100 / 7. 18.100 libswscale 5. 2.100 / 5. 2.100 libswresample 3. 2.100 / 3. 2.100 libpostproc 55. 2.100 / 55. 2.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/path/to/output-4786-second.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.13.100 Duration: 00:00:13.58, start: 0.000000, bitrate: 798 kb/s Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 767 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 29 kb/s (default) Metadata: handler_name : SoundHandler Input #1, mp3, from '/path/to/buddy.mp3': Duration: 00:02:02.12, start: 0.025057, bitrate: 112 kb/s Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 112 kb/s Metadata: encoder : LAME3.99r Stream mapping: Stream #0:1 (aac) -> amerge:in0 (graph 0) Stream #1:0 (mp3float) -> volume (graph 0) Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264)) amerge (graph 0) -> Stream #0:1 (aac) Press [q] to stop, [?] for help [libx264 @ 0x1cae600] using SAR=1/1 [libx264 @ 0x1cae600] using cpu capabilities: none! [libx264 @ 0x1cae600] profile Constrained Baseline, level 3.1 [libx264 @ 0x1cae600] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=22 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=24 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0 [Parsed_amerge_2 @ 0x2ed3780] No channel layout for input 1 Output #0, mp4, to '/path/to/output-4786.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.13.100 Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default) Metadata: handler_name : VideoHandler encoder : Lavc58.19.100 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1 Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, 3.0, fltp, 197 kb/s (default) Metadata: encoder : Lavc58.19.100 aac frame= 82 fps=0.0 q=12.0 size= 0kB time=00:00:02.50 bitrate= 0.2kbits/s speed=4.97x  frame= 157 fps=156 q=18.0 size= 512kB time=00:00:05.57 bitrate= 752.7kbits/s speed=5.53x  frame= 210 fps=139 q=13.0 size= 1280kB time=00:00:07.80 bitrate=1344.0kbits/s speed=5.18x  frame= 273 fps=136 q=12.0 size= 1280kB time=00:00:10.40 bitrate=1008.0kbits/s speed=5.18x  frame= 326 fps=145 q=-1.0 Lsize= 1607kB time=00:00:13.54 bitrate= 972.3kbits/s speed=6.04x  video:1290kB audio:310kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.406112% [libx264 @ 0x1cae600] frame I:2 Avg QP:15.50 size: 21673 [libx264 @ 0x1cae600] frame P:324 Avg QP:13.50 size: 3942 [libx264 @ 0x1cae600] mb I I16..4: 100.0% 0.0% 0.0% [libx264 @ 0x1cae600] mb P I16..4: 1.6% 0.0% 0.0% P16..4: 12.7% 0.0% 0.0% 0.0% 0.0% skip:85.7% [libx264 @ 0x1cae600] coded y,uvDC,uvAC intra: 25.5% 29.6% 12.4% inter: 4.2% 8.3% 1.4% [libx264 @ 0x1cae600] i16 v,h,dc,p: 62% 18% 9% 11% [libx264 @ 0x1cae600] i8c dc,h,v,p: 68% 16% 11% 5% [libx264 @ 0x1cae600] kb/s:777.82 [aac @ 0x1caf980] Qavg: 4402.419 

Последняя попытка команды -

ffmpeg \ -i '.$thepath.'/output-'.$v_Id.'-second.mp4 \ -i '.$musicpath .'/'.$music.'.mp3 \ -filter_complex "[1:a]volume=0.15,apad[A];[0:a][A]amerge[out]" \ -c:v libx264 -c:a aac -map 0:v -map "[out]" \ -preset ultrafast -threads 0 -pix_fmt yuv420p -y '.$thepath.'/output-'.$v_Id.'.mp4 2>&1