未找到输出流＃0：1的编码器（编解码器无）

Question

您好我在Redhat5上构建了ffmpeg可执行文件。我想使用命令multiple混合两个Audio “ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex amix = inputs = 3：duration = first：dropout_transition = 3 OUTPUT.mp3”。

我启用了libflamemp3库而没有任何错误。

[root@localhost ~]# ffmpeg -i /root/media/Katlalli.mp3 -i /root/media/Katlalli.mp3 -filter_complex amix=inputs=2:duration=first:dropout_transition=2 /root/media/OUTPutnew123.mp3
ffmpeg version 2.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Nov 14 2013 03:17:10 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-46)
  configuration: --enable-libmp3lame
  libavutil      52. 48.100 / 52. 48.100
  libavcodec     55. 39.100 / 55. 39.100
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
[mp3 @ 0x193ef240] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from '/root/media/Katlalli.mp3':
  Metadata:
    artist          : Yograj Bhat
    title           : Katlalli Karadige
    track           : 3
    album           : Paramathma
    album_artist    : Puneet Rajkumar
    genre           : Kannada
    composer        : V.Harikrishna
    date            : 2011
  Duration: 00:04:41.46, start: 0.000000, bitrate: 191 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
    Stream #0:1: Video: mjpeg, yuvj420p(pc), 200x200 [SAR 96:96 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      title           : thumbnail
      comment         : Cover (front)
[mp3 @ 0x194090a0] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from '/root/media/Katlalli.mp3':
  Metadata:
    artist          : Yograj Bhat
    title           : Katlalli Karadige
    track           : 3
    album           : Paramathma
    album_artist    : Puneet Rajkumar
    genre           : Kannada
    composer        : V.Harikrishna
    date            : 2011
  Duration: 00:04:41.46, start: 0.000000, bitrate: 191 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
    Stream #1:1: Video: mjpeg, yuvj420p(pc), 200x200 [SAR 96:96 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      title           : thumbnail
      comment         : Cover (front)
File '/root/media/OUTPutnew123.mp3' already exists. Overwrite ? [y/N] y
Output #0, mp3, to '/root/media/OUTPutnew123.mp3':
  Metadata:
    artist          : Yograj Bhat
    title           : Katlalli Karadige
    track           : 3
    album           : Paramathma
    album_artist    : Puneet Rajkumar
    genre           : Kannada
    composer        : V.Harikrishna
    date            : 2011
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp (default)
    Stream #0:1: Video: none, q=2-31, 128 kb/s, 90k tbn
    Metadata:
      title           : thumbnail
      comment         : Cover (front)
Stream mapping:
  Stream #0:0 (mp3) -> amix:input0
  Stream #1:0 (mp3) -> amix:input1
  amix -> Stream #0:0 (libmp3lame)
  Stream #0:1 -> #0:1 (mjpeg -> ?)
Encoder (codec none) not found for output stream #0:1

但是当我尝试组合两个mp3音频时， “ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex amix = inputs = 3：duration = first：dropout_transition = 3 OUTPUT.mp3”。

我收到错误

“输出流＃0：1”

找不到“编码器（编解码器无）”

所以请帮我看看如何在Redhat5上链接或安装“libmp3flame”。

Answer 1

的zlib

我相信ffmpeg正在尝试解码PNG输入视频流（专辑封面）并将输出视频流编码为PNG输出，但我假设您构建的ffmpeg没有zlib支持，这是PNG编码和解码所必需的。

如果可用，会自动检测zlib，因此您需要在ffmpeg编译之前安装zlib标头（Red Hat＆n; n朋友的zlib-devel包）。

省略视频

或者，您可以保留构建并告诉ffmpeg忽略任何带有-vn输出选项的视频。

使用mjpeg

如果您想保留构建并保留专辑封面，请添加-codec:v mjpeg作为输出选项。请参阅stream selection，了解ffmpeg将选择哪两个输入。

使用-codec:v copy

您还可以使用-codec:v copy stream copy视频。这可能比使用-codec:v mjpeg重新编码更可取。请参阅stream selection以了解ffmpeg将选择哪两个输入。如果您添加-map 0 -map 1，则会包含两个视频流。

也见

• Compile FFmpeg on CentOS