最近我在Processing中制作了一个Audio Visualizer。从那里我想将Processing中创建的动画渲染为mp4文件。我在Windows计算机上，并使用ffmpeg将Processing中生成的TIF文件转换为mp4。
当我这样做时，我能够将图像渲染成mp4文件，但是当我播放这个文件时，与我在Processing上播放动画时的动画相比，动画加快了。因此，当我在视频编辑程序中组合mp4文件和音频时，动画不会与音频同步。
当我将帧速率设置为25并且帧数限制为250并将其渲染为mp4文件时，它应该是10秒长，但它包含超过10秒的动画与直接在Processing中播放的动画相比。
我不知道为什么会这样，所以任何帮助都会受到高度赞赏。
我的处理代码：
import ddf.minim.*;
import ddf.minim.analysis.*;
Minim minim;
AudioPlayer player;
PImage img;
FFT fft;
void setup() {
size(728, 546);
minim = new Minim(this);
// this loads mysong.wav from the data folder as a stream with a internal buffer of size 1024
player = minim.loadFile("new_years_good.mp3");
fft = new FFT(player.bufferSize(), player.sampleRate());
player.play();
img= loadImage("cat-in-shades-.jpg");
frameRate(25);
}
void draw() {
image(img, 0, 0);
//tint(0, 100, 150);
stroke(255);
strokeWeight(4);
float a = 0;
float angle = (2*PI) / 200;
fft.forward(player.mix);
for(int i=0; i < player.bufferSize() - 1; i++) {
//player.mix.get(i) is a value between [-1,1]
float x = 250 + cos(a) * (20 * player.mix.get(i) + 100);
float x2 = 540 + cos(a) * (20 * player.mix.get(i) + 100);
float y = 230 + sin(a) * (20 * player.mix.get(i) + 100);
float y2 = 240 + sin(a) * (20 * player.mix.get(i) + 100);
float xFinal = 250 + cos(a+angle) * (20 * player.mix.get(i+1) + 100);
float x2Final = 540 + cos(a+angle) * (20 * player.mix.get(i+1) + 100);
float yFinal = 230 + sin(a+angle) * (20 * player.mix.get(i+1) + 100);
float y2Final = 240 + sin(a+angle) * (20 * player.mix.get(i+1) + 100);
line(x,y,xFinal,yFinal);
line(x2,y2,x2Final,y2Final);
a += angle;
}
noStroke();
fill(255, 0, 0, 128);
for(int i = 0; i < 250; i++)
{
float b = fft.getBand(i);
float yAxis = random(-b, b) + 480;
float xAxis = i*3;
ellipse(xAxis, yAxis, b, b);
}
saveFrame("frame-####.tif");
if(frameCount>250)
{
noLoop();
stop();
}
}
void stop() {
player.close();
minim.stop();
super.stop();
}
我在cmd上输入命令行（作为一行）：
C:\Users\Robert\Documents\Processing\AudioVisulizer>ffmpeg -i C:\Users\Robert\Do
cuments\Processing\AudioVisulizer\frame-%04d.tif -r 25 -pix_fmt yuv420p smallVid
.mp4
输出的内容：
ffmpeg version N-77836-g62dfe1d Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --
enable-lzma --enable-decklink --enable-zlib
libavutil 55. 13.100 / 55. 13.100
libavcodec 57. 22.100 / 57. 22.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, image2, from 'C:\Users\Robert\Documents\Processing\AudioVisulizer\fram
e-%04d.tif':
Duration: 00:00:10.04, start: 0.000000, bitrate: N/A
Stream #0:0: Video: tiff, rgb24, 728x546, 25 fps, 25 tbr, 25 tbn, 25 tbc
[libx264 @ 00000092cd5e3700] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 00000092cd5e3700] profile High, level 3.0
[libx264 @ 00000092cd5e3700] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC cod
ec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 r
ef=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed
_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pski
p=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 deci
mate=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=2
5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.6
0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'smallVid.mp4':
Metadata:
encoder : Lavf57.21.101
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 728x54
6, q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc57.22.100 libx264
Side data:
unknown side data type 10 (24 bytes)
Stream mapping:
Stream #0:0 -> #0:0 (tiff (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame= 52 fps=0.0 q=28.0 size= 77kB time=00:00:00.00 bitrate=N/A speed=
frame= 74 fps= 65 q=28.0 size= 127kB time=00:00:00.88 bitrate=1178.0kbits/
frame= 93 fps= 57 q=28.0 size= 164kB time=00:00:01.64 bitrate= 820.0kbits/
frame= 113 fps= 52 q=28.0 size= 201kB time=00:00:02.44 bitrate= 676.3kbits/
frame= 136 fps= 51 q=28.0 size= 245kB time=00:00:03.36 bitrate= 596.3kbits/
frame= 157 fps= 49 q=28.0 size= 282kB time=00:00:04.20 bitrate= 550.2kbits/
frame= 178 fps= 48 q=28.0 size= 324kB time=00:00:05.04 bitrate= 527.2kbits/
frame= 199 fps= 47 q=28.0 size= 362kB time=00:00:05.88 bitrate= 504.1kbits/
frame= 219 fps= 46 q=28.0 size= 403kB time=00:00:06.68 bitrate= 494.2kbits/
frame= 242 fps= 46 q=28.0 size= 452kB time=00:00:07.60 bitrate= 486.8kbits/
frame= 251 fps= 38 q=-1.0 Lsize= 623kB time=00:00:09.96 bitrate= 512.3kbits
/s speed=1.52x
video:619kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
verhead: 0.607807%
[libx264 @ 00000092cd5e3700] frame I:2 Avg QP:21.74 size: 56596
[libx264 @ 00000092cd5e3700] frame P:66 Avg QP:23.36 size: 2523
[libx264 @ 00000092cd5e3700] frame B:183 Avg QP:31.50 size: 1932
[libx264 @ 00000092cd5e3700] consecutive B-frames: 0.8% 4.0% 6.0% 89.2%
[libx264 @ 00000092cd5e3700] mb I I16..4: 10.9% 72.6% 16.5%
[libx264 @ 00000092cd5e3700] mb P I16..4: 0.0% 0.0% 0.2% P16..4: 4.4% 2.3
% 3.3% 0.0% 0.0% skip:89.7%
[libx264 @ 00000092cd5e3700] mb B I16..4: 0.0% 0.0% 0.5% B16..8: 3.2% 2.0
% 2.3% direct: 1.3% skip:90.7% L0:50.9% L1:42.2% BI: 7.0%
[libx264 @ 00000092cd5e3700] 8x8 transform intra:50.2% inter:10.1%
[libx264 @ 00000092cd5e3700] coded y,uvDC,uvAC intra: 83.4% 32.6% 14.2% inter: 3
.5% 0.2% 0.0%
[libx264 @ 00000092cd5e3700] i16 v,h,dc,p: 22% 8% 8% 62%
[libx264 @ 00000092cd5e3700] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 12% 19% 6% 9%
9% 9% 9% 9%
[libx264 @ 00000092cd5e3700] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 14% 22% 6% 9%
8% 8% 5% 6%
[libx264 @ 00000092cd5e3700] i8c dc,h,v,p: 74% 12% 12% 2%
[libx264 @ 00000092cd5e3700] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 00000092cd5e3700] ref P L0: 41.8% 3.9% 24.3% 30.0%
[libx264 @ 00000092cd5e3700] ref B L0: 64.5% 25.0% 10.5%
[libx264 @ 00000092cd5e3700] ref B L1: 82.2% 17.8%
[libx264 @ 00000092cd5e3700] kb/s:504.56
答案 0 :(得分：0)
你设法在正在运行的程序中获得声音和视频同步的事实可能意味着你在一个免费的CPU上运行它
如果音乐和视频是两个独立的线程（据我所知），则无法保证CPU始终如此运行它们。
因此，如果你想让你的最终视频.mp4同步，你必须在程序之外工作：将它们一起带到视频编辑软件并同步它们。
但是如果你想让它们在程序中同步你就可以了。