问题描述
据我所知，我认为这是一个音频编解码器问题，但由于我对 ffmpeg 不太熟悉，所以可能有任何问题。
W:\PICTURES\\Manual Files>ffmpeg -i "C7984.mp4" -c copy -map 0 -segment_time 00:06:00 -f segment -reset_timestamps 1 C7984%03d.mp4
ffmpeg version 2021-07-11-git-79ebdbb9b9-full_build-www.gyan.dev copyright (c) 2000-2021 the FFmpeg developers
built with gcc 10.3.0 (Rev2,Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 57. 0.100 / 57. 0.100
libavcodec 59. 3.101 / 59. 3.101
libavformat 59. 4.100 / 59. 4.100
libavdevice 59. 0.100 / 59. 0.100
libavfilter 8. 0.103 / 8. 0.103
libswscale 6. 0.100 / 6. 0.100
libswresample 4. 0.100 / 4. 0.100
libpostproc 56. 0.100 / 56. 0.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001f2b61fe100] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1001
[mov,mj2 @ 000001f2b61fe100] st: 0 edit list 1 Cannot find an index entry before timestamp: 1001.
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0,mov,mj2,from 'C7984.mp4':
Metadata:
major_brand : XAVC
minor_version : 16785407
compatible_brands: XAVCmp42iso2
creation_time : 2021-07-09T18:30:52.000000Z
Duration: 00:07:07.93,start: 0.000000,bitrate: 207012 kb/s
Stream #0:0(und): Video: h264 (High 4:2:2) (avc1 / 0x31637661),yuv422p10le(pc),3840x2160 [SAR 1:1 DAR 16:9],200015 kb/s,59.94 fps,59.94 tbr,60k tbn (default)
Metadata:
creation_time : 2021-07-09T18:30:52.000000Z
handler_name : Video Media Handler
vendor_id : [0][0][0][0]
encoder : AVC Coding
Stream #0:1(und): Audio: pcm_s16be (twos / 0x736F7774),48000 Hz,stereo,s16,1536 kb/s (default)
Metadata:
creation_time : 2021-07-09T18:30:52.000000Z
handler_name : Sound Media Handler
vendor_id : [0][0][0][0]
Stream #0:2(und): Data: none (rtmd / 0x646D7472),5401 kb/s (default)
Metadata:
creation_time : 2021-07-09T18:30:52.000000Z
handler_name : Timed Metadata Media Handler
timecode : 23:59:04:56
[segment @ 000001f2b6729440] opening 'C7984000.mp4' for writing
[mp4 @ 000001f2b4627ec0] Could not find tag for codec pcm_s16be in stream #1,codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:2 --
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Stream #0:2 -> #0:2 (copy)
Last message repeated 1 times
在转换剪辑之前是否应该更改代码以将音频转换为flac？谢谢
解决方法
MP4 不支持 PCM，但 MOV 支持。 MP4 确实支持 AAC。
所以，要么
ffmpeg -i "C7984.mp4" -c copy -c:a aac -map 0 -segment_time 00:06:00 -f segment -reset_timestamps 1 C7984%03d.mp4
或
ffmpeg -i "C7984.mp4" -c copy -map 0 -segment_time 00:06:00 -f segment -reset_timestamps 1 C7984%03d.mov
是的，Flac 是无损的，你必须这样做
首先获取 flac 中的音频
ffmpeg -i "C7984.mp4" -map 0:1 -c:a flac audio.flac
获取mp4中唯一的视频，选项-an是音频无...
ffmpeg -i "C7984.mp4" -map 0:0 -c copy -an -dn video.mp4
现在从 C7984.mp4 视频的 pcm_s16be 流中创建一个具有相同视频和 flac 无损音频的新视频...
ffmpeg -i video.mp4 -c:a flac -i audio.flac -c copy -map 0:v -map 1:a:0 -disposition:a:0 default -disposition:a:1 default -strict -2 -sn -dn -map_metadata -1 -map_chapters -1 -movflags faststart fin_video_flac.mp4
注意：如果你想像从第 6 分钟开始的视频一样剪切视频，现在你可以剪切新视频，-ss 选项是视频的开始，持续时间是 de 选项 -t
ffmpeg -ss 00:06:00 -i fin_video_flac.mp4 -t 60 -c copy -strict -2 final_video_60seconds.mp4
问候