ffmpeg-python错误，无法加载mp4编码器

如何解决ffmpeg-python错误，无法加载mp4编码器

当我只是尝试从ffmpeg-python页面进行简单演示时，就会出现此错误：

import ffmpeg
stream = ffmpeg.input('human_face.mp4')
stream = ffmpeg.hflip(stream)
stream = ffmpeg.output(stream,'new_human_face.mp4')
ffmpeg.run(stream)

输出如下：

...
Input #0,mov,mp4,m4a,3gp,3g2,mj2,from 'human_face.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.49.100
  Duration: 00:00:12.45,start: 0.000000,bitrate: 742 kb/s
    Stream #0:0(und): Video: mpeg4 (mp4v / 0x7634706D),none,256x256,741 kb/s,20 fps,20 tbr,10240 tbn,10240 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Automatic encoder selection failed for output stream #0:0. Default encoder for format mp4 (codec mpeg4) is probably disabled or this build of ffmpeg does not include that codec. Please choose an encoder manually.
Error selecting an encoder for stream 0:0
Traceback (most recent call last):
  File "<stdin>",line 1,in <module>
  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/ffmpeg/_run.py",line 325,in run
    raise Error('ffmpeg',out,err)

我认为最重要的日志是：“ 输出流＃0：0的自动编码器选择失败。格式mp4（编解码器mpeg4）的默认编码器可能已禁用，或者此ffmpeg版本不包含该编解码器。请手动选择编码器。“

我已经重新安装了ffmpeg软件包，但错误仍然存​​在。

---

附录1： 感谢@HernánAlarcón的评论：

• 版本为3.4.4。
• ffmpeg -encoders的输出是：

(venv) tristan_jia@linux-ftbv:~/.../data> ffmpeg -encoders
ffmpeg version 3.4.4 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (SUSE Linux)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --incdir=/usr/include/ffmpeg --extra-cflags='-fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -g' --optflags='-fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -g' --disable-htmlpages --enable-pic --disable-stripping --enable-shared --disable-static --enable-gpl --disable-openssl --enable-avresample --enable-libcdio --enable-gnutls --enable-ladspa --disable-cuda --disable-cuvid --enable-libass --enable-libbluray --enable-libcelt --enable-libcdio --enable-libdc1394 --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libzimg --enable-libzvbi --enable-vaapi --enable-vdpau --enable-muxers --enable-demuxers --disable-encoders --disable-decoders --disable-decoder='mpeg4,h263,h264,hevc,vc1' --enable-encoder='apng,ass,ayuv,bmp,ffv1,ffvhuff,flac,gif,huffyuv,jpegls,libgsm,libmp3lame,libopenjpeg,libopus,libschroedinger,libspeex,libtheora,libtwolame,libvorbis,libvpx_vp8,libvpx_vp9,libwebp,libwebp_anim,mjpeg,mp2,mp2fixed,opus,pam,pbm,pcm_alaw,pcm_f32be,pcm_f32le,pcm_f64be,pcm_f64le,pcm_mulaw,pcm_s16be,pcm_s16be_planar,pcm_s16le,pcm_s16le_planar,pcm_s24be,pcm_s24le,pcm_s24le_planar,pcm_s32be,pcm_s32le,pcm_s32le_planar,pcm_s8,pcm_s8_planar,pcm_u16be,pcm_u16le,pcm_u24be,pcm_u24le,pcm_u32be,pcm_u32le,pcm_u8,pcx,pgm,pgmyuv,png,ppm,sgi,srt,ssa,sunrast,targa,text,tiff,v210,v308,v408,v410,vorbis,xbm,xwd,y41p,yuv4,zlib,' --enable-decoder='ac3,ansi,apng,dirac,exr,ffwavesynth,gsm,libcelt,mpeg1video,mpeg2video,mp1,mp1float,mp2float,mp3,mp3float,pcm_bluray,pcm_dvd,pgssub,rawvideo,theora,v210x,vp3,vp5,vp6,vp6a,vp6f,vp8,vp9,webp,'
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Encoders:
 V..... = Video
 A..... = Audio
 S..... = Subtitle
 .F.... = Frame-level multithreading
 ..S... = Slice-level multithreading
 ...X.. = Codec is experimental
 ....B. = Supports draw_horiz_band
 .....D = Supports direct rendering method 1
 ------
 V..... apng                 APNG (Animated Portable Network Graphics) image
 V..... ayuv                 Uncompressed packed MS 4:4:4:4
 V..... bmp                  BMP (Windows and OS/2 bitmap)
 V.S... ffv1                 FFmpeg video codec #1
 VF.... ffvhuff              Huffyuv FFmpeg variant
 V..... gif                  GIF (Graphics Interchange Format)
 VF.... huffyuv              Huffyuv / HuffYUV
 VF.... libopenjpeg          OpenJPEG JPEG 2000 (codec jpeg2000)
 VF.... jpegls               JPEG-LS
 VFS... mjpeg                MJPEG (Motion JPEG)
 V..... pam                  PAM (Portable AnyMap) image
 V..... pbm                  PBM (Portable BitMap) image
 V..... pcx                  PC Paintbrush PCX image
 V..... pgm                  PGM (Portable GrayMap) image
 V..... pgmyuv               PGMYUV (Portable GrayMap YUV) image
 VF.... png                  PNG (Portable Network Graphics) image
 V..... ppm                  PPM (Portable PixelMap) image
 V..... sgi                  SGI image
 V..... sunrast              Sun Rasterfile image
 V..... targa                Truevision Targa image
 V..... libtheora            libtheora Theora (codec theora)
 VF.... tiff                 TIFF image
 V..... v210                 Uncompressed 4:2:2 10-bit
 V..... v308                 Uncompressed packed 4:4:4
 V..... v408                 Uncompressed packed QT 4:4:4:4
 V..... v410                 Uncompressed 4:4:4 10-bit
 V..... libvpx               libvpx VP8 (codec vp8)
 V..... libvpx-vp9           libvpx VP9 (codec vp9)
 V..... libwebp_anim         libwebp WebP image (codec webp)
 V..... libwebp              libwebp WebP image (codec webp)
 V..... xbm                  XBM (X BitMap) image
 V..... xwd                  XWD (X Window Dump) image
 V..... y41p                 Uncompressed YUV 4:1:1 12-bit
 V..... yuv4                 Uncompressed packed 4:2:0
 VF.... zlib                 LCL (LossLess Codec Library) ZLIB
 A..... flac                 FLAC (Free Lossless Audio Codec)
 A..... libgsm               libgsm GSM (codec gsm)
 A..... mp2                  MP2 (MPEG audio layer 2)
 A..... mp2fixed             MP2 fixed point (MPEG audio layer 2) (codec mp2)
 A..... libtwolame           libtwolame MP2 (MPEG audio layer 2) (codec mp2)
 A..... libmp3lame           libmp3lame MP3 (MPEG audio layer 3) (codec mp3)
 A..X.. opus                 Opus
 A..... libopus              libopus Opus (codec opus)
 A..... pcm_alaw             PCM A-law / G.711 A-law
 A..... pcm_f32be            PCM 32-bit floating point big-endian
 A..... pcm_f32le            PCM 32-bit floating point little-endian
 A..... pcm_f64be            PCM 64-bit floating point big-endian
 A..... pcm_f64le            PCM 64-bit floating point little-endian
 A..... pcm_mulaw            PCM mu-law / G.711 mu-law
 A..... pcm_s16be            PCM signed 16-bit big-endian
 A..... pcm_s16be_planar     PCM signed 16-bit big-endian planar
 A..... pcm_s16le            PCM signed 16-bit little-endian
 A..... pcm_s16le_planar     PCM signed 16-bit little-endian planar
 A..... pcm_s24be            PCM signed 24-bit big-endian
 A..... pcm_s24le            PCM signed 24-bit little-endian
 A..... pcm_s24le_planar     PCM signed 24-bit little-endian planar
 A..... pcm_s32be            PCM signed 32-bit big-endian
 A..... pcm_s32le            PCM signed 32-bit little-endian
 A..... pcm_s32le_planar     PCM signed 32-bit little-endian planar
 A..... pcm_s8               PCM signed 8-bit
 A..... pcm_s8_planar        PCM signed 8-bit planar
 A..... pcm_u16be            PCM unsigned 16-bit big-endian
 A..... pcm_u16le            PCM unsigned 16-bit little-endian
 A..... pcm_u24be            PCM unsigned 24-bit big-endian
 A..... pcm_u24le            PCM unsigned 24-bit little-endian
 A..... pcm_u32be            PCM unsigned 32-bit big-endian
 A..... pcm_u32le            PCM unsigned 32-bit little-endian
 A..... pcm_u8               PCM unsigned 8-bit
 A..... libspeex             libspeex Speex (codec speex)
 A..X.. vorbis               Vorbis
 A..... libvorbis            libvorbis (codec vorbis)
 S..... ssa                  ASS (Advanced SubStation Alpha) subtitle (codec ass)
 S..... ass                  ASS (Advanced SubStation Alpha) subtitle
 S..... srt                  SubRip subtitle (codec subrip)
 S..... text                 Raw text subtitle
'''

解决方法

感谢@Hernán的帮助，我知道在OpenSuse上，如果仅使用sudo zypper in ffmpeg，它将安装ffmpeg的过时版本。因此，我删除了此软件包，并使用快照（instruction）重新安装了该软件包。然后它完全正常。希望对其他人有帮助。