blocks|key|328335|text|对mp4视频进行编码的方法有很多种，而在移动设备上对它们进行编码则更加复杂。我不确定你所说的“低成本移动设备”是指设备中的低成本，还是播放视频所需的带宽？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|328336|无论哪种方式，这里有一篇文章可以让你继续前进：H.264+WEB+VIDEO+ENCODING+TUTORIAL+WITH+FFMPEG|offset|length|328337|示例|328338|下面是这篇文章中的一些ffmpeg示例。|style|CODE|328339|328340|标准web视频(480p，500kbit/s)：|blockquote|328341|328342|ffmpeg+-i+input_file.avi+-vcodec+libx264+-vprofile+high+-preset+slow+-b:v+500k+-maxrate+500k+-bufsize+1000k+-vf+scale=-1:480+-threads+++0+-acodec+libvo_aacenc+-b:a+128k+output_file.mp4|BOLD|328343|较老手机的360p视频(基线配置文件中250kbit/s时为360p)：|328344|ffmpeg+-i+inputfile.avi+-vcodec+libx264+-vprofile+baseline+-preset+slow+-b:v+250k+-maxrate+250k+-bufsize+500k+-vf+scale=-1:360+-threads+0+++-acodec+libvo_aacenc+-ab+96k+output.mp4|328345|适用于iPads和平板电脑的480p视频(主配置文件中400kbit/s时为480p)：|328346|ffmpeg+-i+inputfile.avi+-vcodec+libx264+-vprofile+main+-preset+slow+-b:v+400k+-maxrate+400k+-bufsize+800k+-vf+scale=-1:480+-threads+0+-acodec+libvo_aacenc+-ab+128k+output.mp4|328347|用于存档/存储的高质量标清视频(高清模式下1Mbit/s的PAL)：|328348|ffmpeg+-i+inputfile.avi+-vcodec+libx264+-vprofile+high+-preset+slower+-b:v+1000k+-vf+scale=-1:576+-threads+0+-acodec+libvo_aacenc+-ab+++196k+output.mp4|328349|328350|比特率、比例和配置文件...|328351|从这些示例中，您可能需要注意的一些关键事项是……|328352|-b:v+500k|328353|-b:a+128k|328354|这是视频v和音频a的比特率，数字越低，质量越低，但在低端设备上可能会播放得更好。|328355|scale=-1:480|328356|这将把视频缩小到更小的尺寸，请在帖子中查看更多信息)|328357|-vprofile+baseline|328358|在为某些低成本(例如安卓)设备编码时，这个看似奇怪的baseline+(或另一个合适的profile+parameter)可能很重要……|328359|328360|+Baseline+Profile+(BP)|328361|328362|此配置文件主要用于需要额外数据丢失稳健性的低成本应用程序，用于某些视频会议和移动应用程序。此配置文件包括受约束的基线配置文件中支持的所有功能，以及可用于损失稳健性(或用于其他目的，如低延迟多点视频流合成)的三个附加功能。自从2009年定义受约束的基线配置文件以来，此配置文件的重要性已有所减弱。所有受约束的基线配置文件比特流也被认为是基线配置文件比特流，因为这两个配置文件共享相同的配置文件标识符代码值。|328363|entityMap|0|LINK|mutability|MUTABLE|url|https://www.virag.si/2012/01/web-video-encoding-tutorial-with-ffmpeg-0-9/|1|http://en.wikipedia.org/wiki/H.264#Profiles^0|0|N|19|0|0|0|B|6|0|0|0|0|0|54|0|54|0|0|0|4Z|0|4Z|0|0|0|4U|0|4U|0|0|0|47|0|47|0|0|0|0|0|9|0|0|9|0|4|1|8|1|0|0|C|0|0|0|I|0|Q|8|17|H|1|0|0|1|L|0|0|0^^$0|@$1|2|3|4|5|6|7|24|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|25|8|@]|9|@$D|26|E|27|1|28]]|A|$]]|$1|F|3|G|5|6|7|29|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|2A|8|@$D|2B|E|2C|J|K]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|2D|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|2E|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|2F|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|2G|8|@$D|2H|E|2I|J|S]|$D|2J|E|2K|J|K]]|9|@]|A|$]]|$1|T|3|U|5|6|7|2L|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|2M|8|@$D|2N|E|2O|J|S]|$D|2P|E|2Q|J|K]]|9|@]|A|$]]|$1|X|3|Y|5|6|7|2R|8|@]|9|@]|A|$]]|$1|Z|3|10|5|6|7|2S|8|@$D|2T|E|2U|J|S]|$D|2V|E|2W|J|K]]|9|@]|A|$]]|$1|11|3|12|5|6|7|2X|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|2Y|8|@$D|2Z|E|30|J|S]|$D|31|E|32|J|K]]|9|@]|A|$]]|$1|15|3|-4|5|6|7|33|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|34|8|@]|9|@]|A|$]]|$1|18|3|19|5|6|7|35|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|6|7|36|8|@$D|37|E|38|J|K]]|9|@]|A|$]]|$1|1C|3|1D|5|6|7|39|8|@$D|3A|E|3B|J|K]]|9|@]|A|$]]|$1|1E|3|1F|5|6|7|3C|8|@$D|3D|E|3E|J|K]|$D|3F|E|3G|J|K]]|9|@]|A|$]]|$1|1G|3|1H|5|6|7|3H|8|@$D|3I|E|3J|J|K]]|9|@]|A|$]]|$1|1I|3|1J|5|6|7|3K|8|@]|9|@]|A|$]]|$1|1K|3|1L|5|6|7|3L|8|@$D|3M|E|3N|J|K]]|9|@]|A|$]]|$1|1M|3|1N|5|6|7|3O|8|@$D|3P|E|3Q|J|K]]|9|@$D|3R|E|3S|1|3T]]|A|$]]|$1|1O|3|-4|5|6|7|3U|8|@]|9|@]|A|$]]|$1|1P|3|1Q|5|O|7|3V|8|@$D|3W|E|3X|J|S]]|9|@]|A|$]]|$1|1R|3|-4|5|6|7|3Y|8|@]|9|@]|A|$]]|$1|1S|3|1T|5|6|7|3Z|8|@]|9|@]|A|$]]|$1|1U|3|-4|5|6|7|40|8|@]|9|@]|A|$]]]|1V|$1W|$5|1X|1Y|1Z|A|$20|21]]|22|$5|1X|1Y|1Z|A|$20|23]]]]

There are numerous ways to encode mp4 videos, and encoding them for mobile devices is even more complex. I'm not sure what you mean by "low cost mobile" do you mean low cost as in the device, or the bandwidth needed to play said video?

Either way, here a post to get you going: <a href="https://www.virag.si/2012/01/web-video-encoding-tutorial-with-ffmpeg-0-9/">H.264 WEB VIDEO ENCODING TUTORIAL WITH FFMPEG</a>

<h2>Examples</h2>

Here are some <code>ffmpeg</code> examples from the post ...

<blockquote>
 “Standard” web video (480p at 500kbit/s):
 
 <code>ffmpeg -i input_file.avi -vcodec libx264 -vprofile high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:480 -threads
 0 -acodec libvo_aacenc -b:a 128k output_file.mp4</code>
 
 360p video for older mobile phones (360p at 250kbit/s in baseline
 profile):
 
 <code>ffmpeg -i inputfile.avi -vcodec libx264 -vprofile baseline -preset slow -b:v 250k -maxrate 250k -bufsize 500k -vf scale=-1:360 -threads 0
 -acodec libvo_aacenc -ab 96k output.mp4</code>
 
 480p video for iPads and tablets (480p at 400kbit/s in main profile):
 
 <code>ffmpeg -i inputfile.avi -vcodec libx264 -vprofile main -preset slow -b:v 400k -maxrate 400k -bufsize 800k -vf scale=-1:480 -threads 0 -acodec libvo_aacenc -ab 128k output.mp4</code>
 
 High-quality SD video for archive/storage (PAL at 1Mbit/s in high
 profile):
 
 <code>ffmpeg -i inputfile.avi -vcodec libx264 -vprofile high -preset slower -b:v 1000k -vf scale=-1:576 -threads 0 -acodec libvo_aacenc -ab
 196k output.mp4</code>
</blockquote>

<h2>Bitrates, scale and profiles ...</h2>

From the examples there, some of the key things you might need to pay attention to are ...

<code>-b:v 500k</code>

<code>-b:a 128k</code>

Those are bitrates of the video <code>v</code> and audio <code>a</code>, the lower the number the lower the quality but also the better it might 'play' on a low end device.

<code>scale=-1:480</code> 

That will scale the video down to a smaller size, see more info about that in the post)

<code>-vprofile baseline</code>

This seemly odd <code>baseline</code> (or another appropriate <a href="http://en.wikipedia.org/wiki/H.264#Profiles">profile parameter</a>) can be important when encoding for certain lower-cost (e.g. Android) devices ...

<blockquote>
 Baseline Profile (BP)
 
 Primarily for low-cost applications that require additional data loss
 robustness, this profile is used in some videoconferencing and mobile
 applications. This profile includes all features that are supported in
 the Constrained Baseline Profile, plus three additional features that
 can be used for loss robustness (or for other purposes such as
 low-delay multi-point video stream compositing). The importance of
 this profile has faded somewhat since the definition of the
 Constrained Baseline Profile in 2009. All Constrained Baseline Profile
 bitstreams are also considered to be Baseline Profile bitstreams, as
 these two profiles share the same profile identifier code value.
</blockquote>

blocks|key|328390|text|我找到了答案，无论如何，谢谢你的帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|328391|ffmpeg+-i+$input_file+-s+$size+$output_file|code-block|syntax|javascript|328392|$size+:+320X400或任何WidthXHeight|328393|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I found answer,Thanks for help anyway.

<pre><code>ffmpeg -i $input_file -s $size $output_file
</code></pre>

$size : 320X400 or any WidthXHeight

blocks|key|4904656|text|+ffmpeg.exe+-i+"input.mp4"+-vcodec+mpeg4+-preset+slower+-b:v+1000k+-vf+"scale=640:480,setsar=1,fps=30,pad=640:480:0:0"+-acodec+aac+-ac+2+-ar+22050+-ab+128k+"output+(480p).mp4"|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4904657|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> ffmpeg.exe -i &quot;input.mp4&quot; -vcodec mpeg4 -preset slower -b:v 1000k -vf &quot;scale=640:480,setsar=1,fps=30,pad=640:480:0:0&quot; -acodec aac -ac 2 -ar 22050 -ab 128k &quot;output (480p).mp4&quot;
</code></pre>

I would like to use <code>ffmpeg</code> to convert an <code>mp4</code> to 'low size' <code>mp4</code> ... 

I need an <code>mp4</code> file with <code>h263</code> video and <code>aac</code> audio (or some other settings supported by low cost mobile.) My main concern is that the video be playable on most devices.

What would be some possible <code>ffmpeg</code> commands to accomplish this?

Thanks in advance.

Convert mp4 to maximum mobile supported MP4 using FFMPEG

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想使用ffmpeg将mp4转换为'low size‘mp4 ...我需要一个带有h263视频和aac音频的mp4文件(或低成本手机支持的其他一些设置)。我主要关心的是视频是否可以在大多数设备上播放。可以使用哪些ffmpeg命令来实现此目的？提前谢谢。

问使用FFMPEG将mp4转换为移动设备支持的最大MP4
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问使用FFMPEG将mp4转换为移动设备支持的最大MP4EN