Adding music to `VideoClip` doesn't work - moviepy

Question

I am concatenating 1 ImageClip with 2 VideoClips and my goal is to add the music to the concatenated video, but the music might be different length as the video, so I use subclip to cut the music, and add a little fade out at end. But, my problem is... that no audio is written to the video... I tried using VLC player, adding codecs... But nothing worked.

My current code is:

from moviepy.editor import *

for_delivery = concatenate([ImageClip('img.jpg').set_duration(3), VideoFileClip('a.mp4'), VideoFileClip('b.mp4')], method='chain')
music_file = AudioFileClip('coolmusic.mp3')
for_delivery = for_delivery.set_audio(music_file.subclip(0, for_delivery.duration).audio_fadeout(2))
for_delivery.write_videofile(target_path, fps=clip.fps, bitrate='%dK' % (bitrate), threads=50, preset='superfast', verbose=False, logger=None, write_logfile=True)

For some reason, no audio is written to the video. The video is concatenated as desired, but the video is outputted without any sound.

The logfile output is:

ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200726
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --enable-librav1e --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, rawvideo, from 'pipe:':
  Duration: N/A, start: 0.000000, bitrate: 1491499 kb/s
    Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1920x1080, 1491499 kb/s, 29.97 tbr, 29.97 tbn, 29.97 tbc
Input #1, mp3, from 'demo-testTEMP_MPY_wvf_snd.mp3':
  Metadata:
    encoder         : Lavf58.45.100
  Duration: 00:01:06.04, start: 0.025057, bitrate: 128 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.91
Please use -b:a or -b:v, -b is ambiguous
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
[libx264 @ 000001f00526ec00] Application has requested 50 threads. Using a thread count greater than 16 is not recommended.
[libx264 @ 000001f00526ec00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 000001f00526ec00] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 000001f00526ec00] 264 - core 161 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x3 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=50 lookahead_threads=8 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=abr mbtree=0 bitrate=7833 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 pb_ratio=1.30 aq=1:1.00
Output #0, mp4, to 'demo-test.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 7833 kb/s, 29.97 fps, 11988 tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/7833000 buffer size: 0 vbv_delay: N/A
[rawvideo @ 000001f005266340] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
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frame= 1383 fps= 20 q=23.0 size=   43520kB time=00:00:44.14 bitrate=8076.2kbits/s speed=0.651x    
frame= 1389 fps= 20 q=22.0 size=   43776kB time=00:00:44.34 bitrate=8087.0kbits/s speed=0.649x    
frame= 1394 fps= 20 q=24.0 size=   44032kB time=00:00:44.51 bitrate=8103.8kbits/s speed=0.647x    
frame= 1400 fps= 20 q=26.0 size=   44288kB time=00:00:44.71 bitrate=8114.4kbits/s speed=0.645x    
frame= 1406 fps= 20 q=25.0 size=   44544kB time=00:00:44.91 bitrate=8124.9kbits/s speed=0.643x    
frame= 1415 fps= 20 q=24.0 size=   45056kB time=00:00:45.21 bitrate=8163.7kbits/s speed=0.643x    
frame= 1431 fps= 20 q=24.0 size=   45824kB time=00:00:45.74 bitrate=8206.0kbits/s speed=0.646x    
frame= 1446 fps= 20 q=25.0 size=   46592kB time=00:00:46.24 bitrate=8253.2kbits/s speed=0.648x    
frame= 1461 fps= 20 q=24.0 size=   46848kB time=00:00:46.74 bitrate=8209.7kbits/s speed=0.651x    
frame= 1475 fps= 20 q=26.0 size=   47104kB time=00:00:47.21 bitrate=8172.9kbits/s speed=0.653x    
frame= 1491 fps= 20 q=24.0 size=   47360kB time=00:00:47.74 bitrate=8125.5kbits/s speed=0.655x    
frame= 1507 fps= 21 q=25.0 size=   47616kB time=00:00:48.28 bitrate=8079.1kbits/s speed=0.658x    
frame= 1522 fps= 21 q=24.0 size=   47872kB time=00:00:48.78 bitrate=8039.2kbits/s speed=0.66x    
frame= 1538 fps= 21 q=25.0 size=   48384kB time=00:00:49.31 bitrate=8037.2kbits/s speed=0.663x    
frame= 1553 fps= 21 q=23.0 size=   48640kB time=00:00:49.81 bitrate=7998.5kbits/s speed=0.665x    
frame= 1568 fps= 21 q=25.0 size=   48896kB time=00:00:50.31 bitrate=7960.6kbits/s speed=0.667x    
frame= 1581 fps= 21 q=23.0 size=   49152kB time=00:00:50.75 bitrate=7933.9kbits/s speed=0.669x    
frame= 1596 fps= 21 q=25.0 size=   49664kB time=00:00:51.25 bitrate=7938.3kbits/s speed=0.671x    
frame= 1613 fps= 21 q=19.0 size=   49920kB time=00:00:51.81 bitrate=7891.9kbits/s speed=0.674x    
frame= 1629 fps= 21 q=16.0 size=   50176kB time=00:00:52.35 bitrate=7851.4kbits/s speed=0.676x    
frame= 1644 fps= 21 q=15.0 size=   50688kB time=00:00:52.85 bitrate=7856.5kbits/s speed=0.678x    
frame= 1660 fps= 21 q=19.0 size=   50944kB time=00:00:53.38 bitrate=7817.2kbits/s speed=0.68x    
frame= 1673 fps= 21 q=16.0 size=   50944kB time=00:00:53.82 bitrate=7754.2kbits/s speed=0.682x    
frame= 1686 fps= 21 q=17.0 size=   51200kB time=00:00:54.25 bitrate=7730.8kbits/s speed=0.683x    
frame= 1699 fps= 21 q=23.0 size=   51456kB time=00:00:54.68 bitrate=7707.9kbits/s speed=0.684x    
frame= 1712 fps= 21 q=23.0 size=   51456kB time=00:00:55.12 bitrate=7647.2kbits/s speed=0.685x    
frame= 1723 fps= 21 q=20.0 size=   51456kB time=00:00:55.48 bitrate=7596.6kbits/s speed=0.685x    
frame= 1736 fps= 21 q=20.0 size=   51712kB time=00:00:55.92 bitrate=7575.2kbits/s speed=0.686x    
frame= 1751 fps= 21 q=22.0 size=   52224kB time=00:00:56.42 bitrate=7582.3kbits/s speed=0.688x    
frame= 1765 fps= 21 q=21.0 size=   52480kB time=00:00:56.89 bitrate=7556.9kbits/s speed=0.689x    
frame= 1779 fps= 21 q=24.0 size=   53248kB time=00:00:57.35 bitrate=7605.1kbits/s speed=0.691x    
frame= 1794 fps= 21 q=24.0 size=   53760kB time=00:00:57.85 bitrate=7611.8kbits/s speed=0.693x    
frame= 1810 fps= 22 q=24.0 size=   54272kB time=00:00:58.39 bitrate=7614.0kbits/s speed=0.695x    
frame= 1827 fps= 22 q=20.0 size=   55040kB time=00:00:58.95 bitrate=7647.5kbits/s speed=0.697x    
frame= 1843 fps= 22 q=22.0 size=   55552kB time=00:00:59.49 bitrate=7649.4kbits/s speed=0.699x    
frame= 1859 fps= 22 q=19.0 size=   56064kB time=00:01:00.02 bitrate=7651.2kbits/s speed=0.701x    
frame= 1874 fps= 22 q=20.0 size=   56320kB time=00:01:00.52 bitrate=7622.6kbits/s speed=0.703x    
frame= 1887 fps= 22 q=23.0 size=   57088kB time=00:01:00.96 bitrate=7671.5kbits/s speed=0.704x    
frame= 1900 fps= 22 q=22.0 size=   57344kB time=00:01:01.39 bitrate=7651.5kbits/s speed=0.705x    
frame= 1914 fps= 22 q=22.0 size=   57856kB time=00:01:01.86 bitrate=7661.5kbits/s speed=0.706x    
frame= 1925 fps= 22 q=22.0 size=   58368kB time=00:01:02.22 bitrate=7683.7kbits/s speed=0.706x    
frame= 1938 fps= 22 q=24.0 size=   58624kB time=00:01:02.66 bitrate=7664.0kbits/s speed=0.707x    
frame= 1954 fps= 22 q=23.0 size=   59392kB time=00:01:03.19 bitrate=7698.8kbits/s speed=0.709x    
frame= 1969 fps= 22 q=21.0 size=   59648kB time=00:01:03.69 bitrate=7671.3kbits/s speed=0.71x    
frame= 1979 fps= 22 q=-1.0 Lsize=   62073kB time=00:01:05.93 bitrate=7712.4kbits/s speed=0.732x    
video:62051kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.035899%
[libx264 @ 000001f00526ec00] frame I:10    Avg QP:15.73  size:237324
[libx264 @ 000001f00526ec00] frame P:795   Avg QP:21.37  size: 52874
[libx264 @ 000001f00526ec00] frame B:1174  Avg QP:21.50  size: 16295
[libx264 @ 000001f00526ec00] consecutive B-frames: 17.5%  7.9%  6.7% 67.9%
[libx264 @ 000001f00526ec00] mb I  I16..4: 21.9% 28.8% 49.4%
[libx264 @ 000001f00526ec00] mb P  I16..4:  3.5%  3.9%  1.7%  P16..4: 55.8%  0.0%  0.0%  0.0%  0.0%    skip:35.2%
[libx264 @ 000001f00526ec00] mb B  I16..4:  0.2%  0.2%  0.1%  B16..8: 21.8%  0.0%  0.0%  direct:11.7%  skip:65.9%  L0:39.7% L1:45.1% BI:15.2%
[libx264 @ 000001f00526ec00] final ratefactor: 22.21
[libx264 @ 000001f00526ec00] 8x8 transform intra:40.9% inter:34.1%
[libx264 @ 000001f00526ec00] coded y,uvDC,uvAC intra: 51.3% 33.7% 14.7% inter: 17.0% 8.1% 0.6%
[libx264 @ 000001f00526ec00] i16 v,h,dc,p: 59% 22% 14%  5%
[libx264 @ 000001f00526ec00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 27% 22%  5%  5%  4%  8%  4%  8%
[libx264 @ 000001f00526ec00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 25% 14%  6%  6%  5%  8%  4%  9%
[libx264 @ 000001f00526ec00] i8c dc,h,v,p: 55% 23% 14%  7%
[libx264 @ 000001f00526ec00] Weighted P-Frames: Y:6.9% UV:5.2%
[libx264 @ 000001f00526ec00] kb/s:7697.90

Is there anyway to fix this?

Edit:

My MoviePy version is 1.0.1, and Python version is 3.8.8.

Answer 1

I realized this is a bug with moviepy... In my version (1.0.1), in the backend of moviepy there is an ffmpeg parameter that is -an... As mentioned in the documentation, -an disables all audio streams of the video. It says:

As an input option, blocks all audio streams of a file from being filtered or being automatically selected or mapped for any output. See -discard option to disable streams individually.

As an output option, disables audio recording i.e. automatic selection or mapping of any audio stream. For full manual control see the -map option.

So the fix was to go into the site-packages and update the moviepy backend code. I saw this on GitHub.

So open <path to your site-packages>\site-packages\moviepy\video\io\ffmpeg_writer.py, and go to line 86 and change the line from:

            '-i', '-', '-an',

To:

            '-i', '-'#, '-an',

So, in other words, if your moviepy version is currently 1.0.1, either update your version to a higher version, or comment out the '-an' parameter in the ffmpeg command.

It's a real pity that I have to spent an entire day trying to fix this problem that I am not causing... I tried all suggested solutions of changing codecs, keeping audio_tempfiles, adding ffmpeg_params and much more.

I am answering my own question so that if others stumble onto this same trouble, they don't need to beat their brains out for a day, they can just take a look at this question.

So, hope it helped...