背景：
- 我正在尝试输入视频（其中包括音频），使用 cv2（一个 Python 库）将其分成几帧，对这些帧应用一些更改，然后使用 ffmpeg 将它们重新拼接在一起并添加回原始音频。
我的问题
- 当我执行这些步骤时，音频与视频不匹配。视频似乎落后于音频。我怀疑这是因为原始视频显示其帧速率为 29.8218 fps，而 ffmpeg 可能将其视为 29 fps。
我的问题
- 我如何让 ffmpeg 以 29.8218 fps 的速率创建帧？
更多信息
这是我用来拼接图像的命令：
ffmpeg -framerate X -i <path-to-input-images> -y <output>
这是我用来将无声视频与音频结合起来制作最终视频的命令：
ffmpeg -i <video-path> -i <audio-path> -codec copy <output-path>
以下是上述两个命令生成的日志：
ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --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-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
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
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, image2, from 'C:\Users\Nathan\Documents\rhymecraft\server\services\generate_video_for_lyrics\frames\192/%09d.png':
Duration: 00:01:01.55, start: 0.000000, bitrate: N/A
Stream #0:0: Video: png, rgba(pc), 406x720, 29 fps, 29 tbr, 29 tbn, 29 tbc
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 00000227a18c10a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 00000227a18c10a0] profile High 4:4:4 Predictive, level 3.0, 4:4:4 8-bit
[libx264 @ 00000227a18c10a0] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'C:\Users\Nathan\Documents\rhymecraft\server\services\generate_video_for_lyrics\soundless_videos\192\movie.mp4':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 406x720, q=-1--1, 29 fps, 14848 tbn, 29 tbc
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 1785 fps= 53 q=-1.0 Lsize= 4759kB time=00:01:01.44 bitrate= 634.4kbits/s speed=1.83x
video:4737kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.453360%
[libx264 @ 00000227a18c10a0] frame I:9 Avg QP:19.92 size: 12889
[libx264 @ 00000227a18c10a0] frame P:493 Avg QP:22.73 size: 5537
[libx264 @ 00000227a18c10a0] frame B:1283 Avg QP:26.34 size: 1562
[libx264 @ 00000227a18c10a0] consecutive B-frames: 3.2% 1.6% 3.5% 91.7%
[libx264 @ 00000227a18c10a0] mb I I16..4: 45.9% 0.0% 54.1%
[libx264 @ 00000227a18c10a0] mb P I16..4: 14.6% 0.0% 7.8% P16..4: 37.5% 14.2% 4.2% 0.0% 0.0% skip:21.8%
[libx264 @ 00000227a18c10a0] mb B I16..4: 1.4% 0.0% 0.8% B16..8: 43.3% 5.3% 0.6% direct: 1.0% skip:47.6% L0:48.9% L1:47.5% BI: 3.6%
[libx264 @ 00000227a18c10a0] coded y,u,v intra: 26.9% 10.0% 12.4% inter: 6.1% 0.9% 1.8%
[libx264 @ 00000227a18c10a0] i16 v,h,dc,p: 35% 23% 16% 26%
[libx264 @ 00000227a18c10a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 17% 22% 5% 7% 7% 6% 5% 3%
[libx264 @ 00000227a18c10a0] Weighted P-Frames: Y:1.0% UV:0.4%
[libx264 @ 00000227a18c10a0] ref P L0: 58.3% 11.2% 20.1% 10.4% 0.1%
[libx264 @ 00000227a18c10a0] ref B L0: 90.1% 7.8% 2.1%
[libx264 @ 00000227a18c10a0] ref B L1: 95.8% 4.2%
[libx264 @ 00000227a18c10a0] kb/s:630.39
ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --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-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
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
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\Nathan\Documents\rhymecraft\server\services\generate_video_for_lyrics\soundless_videos\192/movie.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.83.100
Duration: 00:01:01.55, start: 0.000000, bitrate: 633 kb/s
Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 406x720, 630 kb/s, 29 fps, 29 tbr, 14848 tbn, 58 tbc (default)
Metadata:
handler_name : VideoHandler
Input #1, mp3, from 'C:\Users\Nathan\Documents\rhymecraft\server\services\generate_video_for_lyrics\audio_files\64e5ed6ec1556b3cfb2fe1f39aa670cd.mp3':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: mp41mp42isom
encoder : Lavf58.27.103
Duration: 00:01:00.03, start: 0.025057, bitrate: 192 kb/s
Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
Metadata:
encoder : Lavc58.52
Output #0, avi, to 'C:\Users\Nathan\Documents\rhymecraft\server\services\generate_video_for_lyrics\finished_videos\192\output.avi':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
ISFT : Lavf57.83.100
Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 406x720, q=2-31, 630 kb/s, 29 fps, 29 tbr, 58 tbn, 58 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 192 kb/s
Metadata:
encoder : Lavc58.52
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 1785 fps=0.0 q=-1.0 Lsize= 6294kB time=00:01:01.46 bitrate= 838.9kbits/s speed=3.42e+003x
video:4737kB audio:1407kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.446166%