流利的ffmpeg大小输出选项不起作用 [英] fluent ffmpeg size output option not working
问题描述
摘要:我正在尝试将输出限制为3mb，.outputOptions('-fs 3000000')对我不起作用，文件返回的大小为119260428或119mb.
Summary: I'm trying to limit output to 3mb, .outputOptions('-fs 3000000') isn't working for me, the file is coming back with a size of 119260428 or 119mb.
这是您自己尝试的代码，您需要的是test.mp3足够大，使得生成的testoutput.ogg大于3mb:
Here is the code to try for yourself, all you need is a test.mp3 large enough that the resulting testoutput.ogg is > 3mb:
var ffmpeg = require("fluent-ffmpeg");
var command = ffmpeg();
var convertToOGG = function(){
var fileName = 'test.mp3'
ffmpeg.ffprobe(fileName, function(err, metadata) {
command
.input(fileName)
.inputFormat("mp3")
.audioChannels(1)
.outputOptions('-fs', 3000000)
.output('testoutput.ogg')
.on("progress", function(progress) {
console.log("Processing: " + progress.timemark);
})
.on("error", function(err, stdout, stderr) {
console.log("Cannot process video: " + err.message);
})
.on("end", function(stdout, stderr) {
ffmpeg.ffprobe('testoutput.ogg', function(err,metadata){
if(metadata.format.size >= 3000000){
console.log("didn't work")
}
})
})
.run();
});
};
convertToOGG();
根据 fluent-ffmpeg文档，您应该可以使用ffmpeg命令的输出选项:outputOption()
Per the fluent-ffmpeg documentation you should be able to use a ffmpeg command in an output option: outputOption()
此方法允许将任何与输出相关的选项传递给ffmpeg.您可以使用单个参数来调用它以传递单个选项，即optionnaly 带有空格分隔的参数:
This method allows passing any output-related option to ffmpeg. You can call it with a single argument to pass a single option, optionnaly with a space-separated parameter:
/* Single option */
ffmpeg('/path/to/file.avi').outputOptions('-someOption');
-fs limit_size(输出)设置文件大小限制，以字节为单位.超出限制后，不再写入更多字节字节.这 输出文件的大小略大于请求的文件大小.
-fs limit_size (output) Set the file size limit, expressed in bytes. No further chunk of bytes is written after the limit is exceeded. The size of the output file is slightly more than the requested file size.
这并没有给我带来任何错误，只是似乎忽略了文件大小限制为99mb并输出119.3mb的文件.
It's giving me no errors, just seemingly ignoring the file size limit of 99mb and outputting a 119.3mb file.
编辑-看起来-fs 3000000正在将mp3转换为wav，但仍不会将mp3转换为ogg.这是在终端中运行命令的输出:
Edit - Looks like -fs 3000000 is working for mp3 to wav, but still wont do mp3 to ogg. This is the output from running the command in terminal:
✗ ffmpeg -i test.mp3 -fs 3000000 testoutput.ogg
ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
built with Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
libavutil 55. 34.100 / 55. 34.100
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.100 / 57. 56.100
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
[mp3 @ 0x7fc6a4000000] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'test.mp3':
Metadata:
lyrics-eng : xxx
title : xxx
artist : xxx
album_artist : xxx
album : xxx
genre : xxx
Duration: 03:27:28.74, start: 0.000000, bitrate: 128 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 128 kb/s
Stream #0:1: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 540x360, 90k tbr, 90k tbn, 90k tbc
Metadata:
title : Array
comment : Cover (front)
[swscaler @ 0x7fc6a4808800] deprecated pixel format used, make sure you did set range correctly
[ogg @ 0x7fc6a3815800] Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or -vsync 2
Output #0, ogg, to 'testoutput.ogg':
Metadata:
lyrics-eng : xxx
title : xxx
artist : xxx
album_artist : xxx
album : xxx
genre : xxx
encoder : Lavf57.56.100
Stream #0:0: Video: theora (libtheora), yuv444p, 540x360, q=2-31, 200 kb/s, 90k fps, 90k tbn, 90k tbc
Metadata:
title : Array
DESCRIPTION : Cover (front)
encoder : Lavc57.64.101 libtheora
lyrics-eng : xxx
artist : xxx
ALBUMARTIST : xxx
album : xxx
genre : xxx
Stream #0:1: Audio: vorbis (libvorbis), 44100 Hz, mono, fltp
Metadata:
encoder : Lavc57.64.101 libvorbis
lyrics-eng : xxx
title : xxx
artist : xxx
ALBUMARTIST : xxx
album : xxx
genre : xxx
Stream mapping:
Stream #0:1 -> #0:0 (mjpeg (native) -> theora (libtheora))
Stream #0:0 -> #0:1 (mp3 (native) -> vorbis (libvorbis))
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=-0.0 Lsize= 116465kB time=03:27:28.71 bitrate= 76.6kbits/s speed=61.2x
video:9kB audio:114907kB subtitle:0kB other streams:0kB global headers:6kB muxing overhead: 1.347787%
推荐答案
源mp3包含封面图像.尝试将源文件转码为ogg会导致视频流的帧率异常高.
The source mp3 contains a cover image. Attempting to transcode the source file to ogg results in an unusually high framerate for the video stream.
帧速率估算存在问题:90k fps类似于流时基值:
There's a problem with the framerate estimation: 90k fps resembles the stream timebase value:
[ogg @ 0x7fc6a3815800] Frame rate very high for a muxer not efficiently supporting it.
[...]
Stream #0:0: Video: theora (libtheora), yuv444p, 540x360, q=2-31, 200 kb/s, 90k fps, 90k tbn, 90k tbc
这可能是由于源文件出现问题，ffmpeg中的错误或两者兼而有之.
This could be caused by a problem with the source file, a bug in ffmpeg or maybe both.
一种快速的解决方案是使用-map 0:a或-vn忽略封面图像.
A quick solution is to ignore the cover image using either -map 0:a or -vn.
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