ffmpeg - ffmpeg 可以在不重新编码的情况下从 rmvb 文件中复制部分内容吗？

Question

我想从 rmvb 文件中快速复制部分而不重新编码。此命令适用于 mp4 文件，但不适用于 rmbv(我在此处删除了开始时间和持续时间):

ffmpeg -i input -c copy output

当我像这样将它与 rmvb 一起使用时:

ffmpeg -i 1.rmvb -c copy 1.mp4

我收到此错误:

[mp4 @ 00bb8980] Could not find tag for codec rv40 in stream #0, codec not curre ntly supported in container Could not write header for output file #0 (incorrect codec parameters ?): Invali d argument Stream mapping: Stream #0:1 -> #0:0 (copy) Stream #0:0 -> #0:1 (copy)

我也试过这个:

ffmpeg -i 1.rmvb -c copy 2.rmvb

并得到这个错误:

[NULL @ 04748980] Unable to find a suitable output format for '2.rmvb' 2.rmvb: Invalid argument

我试过这个命令:

ffmpeg -i 1.rmvb -c:v copy -c:a aac -strict experimental -b:a 128k 1.mp4

并得到这个错误:

[mp4 @ 046e0020] Could not find tag for codec rv40 in stream #0, codec not curre ntly supported in container Could not write header for output file #0 (incorrect codec parameters ?): Invali d argument Error initializing output stream 0:1 -- [aac @ 046e1bc0] Qavg: nan Conversion failed!

我读了 this topic :
但该解决方案对我不起作用。经过多次试验，这是有效的命令(并且花费了太长时间):

ffmpeg -i 1.rmvb -c:v libx264 -b:a 32k output.mp4

但我不想重新编码文件。有什么解决办法吗？

编辑:
我试过了:

ffmpeg -i 1.rmvb -c copy 1.mkv

ffmpeg version N-86447-gfeb13ae Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.1.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth -- enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug - -enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable -libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib libavutil 55. 63.100 / 55. 63.100 libavcodec 57. 98.100 / 57. 98.100 libavformat 57. 73.100 / 57. 73.100 libavdevice 57. 7.100 / 57. 7.100 libavfilter 6. 92.100 / 6. 92.100 libswscale 4. 7.101 / 4. 7.101 libswresample 2. 8.100 / 2. 8.100 libpostproc 54. 6.100 / 54. 6.100 [rm @ 033a7520] Invalid stream index 2 for index at pos 206099254 Input #0, rm, from '1.rmvb': Metadata: title : ArabSeed.CoM author : ArabSeed.CoM copyright : ArabSeed.CoM comment : ASMRuleBook : #($Bandwidth >= 0),Stream0Bandwidth = 64082, Stream1Bandwi dth = 285918; Audiences : Easy RealMedia Tool's Audience; audioMode : music Creation Date : 4/22/2010 4:31:14 Description : This File is Created by Easy RealMedia Tools@! Email : rick@redcheek.net Generated By : Easy RealMedia Tools V1.8x HomeWeb : http://redcheek.net Keywords : ArabSeed.CoM Modification Date: 4/22/2010 4:31:14 videoMode : normal Duration: 01:16:35.69, start: 0.000000, bitrate: 358 kb/s Stream #0:0: Audio: cook (cook / 0x6B6F6F63), 44100 Hz, stereo, fltp, 64 kb/ s Stream #0:1: Video: rv40 (RV40 / 0x30345652), yuv420p, 720x408, 280 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc Output #0, matroska, to '1.mkv': Metadata: title : ArabSeed.CoM author : ArabSeed.CoM copyright : ArabSeed.CoM comment : ASMRuleBook : #($Bandwidth >= 0),Stream0Bandwidth = 64082, Stream1Bandwi dth = 285918; Audiences : Easy RealMedia Tool's Audience; audioMode : music Creation Date : 4/22/2010 4:31:14 Description : This File is Created by Easy RealMedia Tools@! Email : rick@redcheek.net Generated By : Easy RealMedia Tools V1.8x HomeWeb : http://redcheek.net Keywords : ArabSeed.CoM Modification Date: 4/22/2010 4:31:14 videoMode : normal encoder : Lavf57.73.100 Stream #0:0: Video: rv40 (RV40 / 0x30345652), yuv420p, 720x408, q=2-31, 280 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc Stream #0:1: Audio: cook ([255][255][255][255] / 0xFFFFFFFF), 44100 Hz, ster eo, fltp, 64 kb/s Stream mapping: Stream #0:1 -> #0:0 (copy) Stream #0:0 -> #0:1 (copy) Press [q] to stop, [?] for help [matroska @ 05228980] The Matroska muxer does not yet support muxing cook av_interleaved_write_frame(): Not yet implemented in FFmpeg, patches welcome Error writing trailer of 1.mkv: Not yet implemented in FFmpeg, patches welcome frame= 21 fps=0.0 q=-1.0 Lsize= 0kB time=00:00:01.48 bitrate= 0.0kbits /s speed= 148x video:2kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing ove rhead: unknown Conversion failed!

我也试过:

ffmpeg -i 1.rmvb -c copy 1.avi

ffmpeg version N-86447-gfeb13ae Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.1.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
-enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
 --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  libavutil      55. 63.100 / 55. 63.100
  libavcodec     57. 98.100 / 57. 98.100
  libavformat    57. 73.100 / 57. 73.100
  libavdevice    57.  7.100 / 57.  7.100
  libavfilter     6. 92.100 /  6. 92.100
  libswscale      4.  7.101 /  4.  7.101
  libswresample   2.  8.100 /  2.  8.100
  libpostproc    54.  6.100 / 54.  6.100
[rm @ 00077520] Invalid stream index 2 for index at pos 206099254
Input #0, rm, from '1.rmvb':
  Metadata:
    title           : ArabSeed.CoM
    author          : ArabSeed.CoM
    copyright       : ArabSeed.CoM
    comment         :
    ASMRuleBook     : #($Bandwidth >= 0),Stream0Bandwidth = 64082, Stream1Bandwi
dth = 285918;
    Audiences       : Easy RealMedia Tool's Audience;
    audioMode       : music
    Creation Date   : 4/22/2010 4:31:14
    Description     : This File is Created by Easy RealMedia Tools@!
    Email           : rick@redcheek.net
    Generated By    : Easy RealMedia Tools V1.8x
    HomeWeb         : http://redcheek.net
    Keywords        : ArabSeed.CoM
    Modification Date: 4/22/2010 4:31:14
    videoMode       : normal
  Duration: 01:16:35.69, start: 0.000000, bitrate: 358 kb/s
    Stream #0:0: Audio: cook (cook / 0x6B6F6F63), 44100 Hz, stereo, fltp, 64 kb/
s
    Stream #0:1: Video: rv40 (RV40 / 0x30345652), yuv420p, 720x408, 280 kb/s, 25
 fps, 25 tbr, 1k tbn, 1k tbc
Could not write header for output file #0 (incorrect codec parameters ?): Operat
ion not permitted
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
    Last message repeated 1 times

Answer 1

没有 rv40流进行测试，但您应该能够复用到 MKV、AVI 和 RM。

ffmpeg -i 1.rmvb -c copy 1.mkv
ffmpeg -i 1.rmvb -c copy 1.rm
ffmpeg -i 1.rmvb -c copy 1.avi