我有几个 60 fps 的 GoPro 录像，我想将它们连接起来。ffmpeg -analyzeduration 2147483647 -probesize 2147483647 -f concat -safe 0 -i concat_list.txt -c copy out.MP4连接 GoPro 视频的正确命令是什么？concat_list.txt 包含 GoPro 视频文件 (mp4) 的列表。我之所以问这个问题，是因为连接后的视频比所有单个视频时长的总和长 2 秒。当我运行命令时，输出如下所示（我在 Win 7 上运行它）：
ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.3.1 (GCC) 20190414
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
libavutil 56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat 58. 20.100 / 58. 20.100
libavdevice 58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc 55. 3.100 / 55. 3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000000004ee340] Auto-inserting h264_mp4toannexb bitstream filter
[concat @ 00000000004e2cc0] Could not find codec parameters for stream 2 (Unknown: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, concat, from 'U:\GoPro_concat\concat_video.txt':
Duration: N/A, start: 0.000000, bitrate: 15110 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1280x720 [SAR 1:1 DAR 16:9], 14982 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc
Metadata:
creation_time : 2019-04-16T13:18:14.000000Z
handler_name : GoPro AVC
encoder : GoPro AVC encoder
timecode : 13:17:26:44
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s
Metadata:
creation_time : 2019-04-16T13:18:14.000000Z
handler_name : GoPro AAC
timecode : 13:17:26:44
Stream #0:2: Unknown: none
Output #0, mp4, to 'U:\GoPro_concat\GoPro_concat.MP4':
Metadata:
encoder : Lavf58.20.100
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 14982 kb/s, 0.02 fps, 59.94 tbr, 60k tbn, 60k tbc
Metadata:
creation_time : 2019-04-16T13:18:14.000000Z
handler_name : GoPro AVC
encoder : GoPro AVC encoder
timecode : 13:17:26:44
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s
Metadata:
creation_time : 2019-04-16T13:18:14.000000Z
handler_name : GoPro AAC
timecode : 13:17:26:44
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000000066703980] Auto-inserting h264_mp4toannexb bitstream filter
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000000066703980] Auto-inserting h264_mp4toannexb bitstream filter
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000000005b440c0] Auto-inserting h264_mp4toannexb bitstream filter
frame=268936 fps=1647 q=-1.0 Lsize= 8282945kB time=01:14:46.73 bitrate=15123.2kbits/s speed=27.5x
video:8205691kB audio:70105kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.086390%
在一个原始文件上运行ffmpeg -i会产生以下输出：
ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/media/102GOPRO/GOPR0333.MP4':
Metadata:
major_brand : avc1
minor_version : 0
compatible_brands: avc1isom
creation_time : 2019-04-16 13:18:14
Duration: 00:19:53.73, start: 0.000000, bitrate: 15122 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1280x720 [SAR 1:1 DAR 16:9], 14982 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
Metadata:
creation_time : 2019-04-16 13:18:14
handler_name : GoPro AVC
encoder : GoPro AVC encoder
timecode : 13:17:26:44
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
Metadata:
creation_time : 2019-04-16 13:18:14
handler_name : GoPro AAC
timecode : 13:17:26:44
Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2019-04-16 13:18:14
timecode : 13:17:26:44
答案1
由于各个音轨的时间戳不同，持续时间差异可能是错误的整体估计。如果您在各个视频的边界处没有看到任何故障，那么应该没问题。
关于“MP4 到附件 B”过滤器的信息不是一个警告；您可以忽略它。
最后，似乎原始文件中有一个时间码轨道在连接视频时会丢失。如果您不打算使用该时间码做任何事情，这不是问题。如果您想同步同一事件的多个 GoPro 录制内容，该时间码可能会有用。