我可以使用ffmpeg将JPEG输出到内存流而不是文件中吗？ [英] Can I use ffmpeg to output JPEGs to a memory stream instead of a file?

问题描述

我有一个C＃应用程序。我有100个JPEG（例如）。

I have a C# app. I have 100 JPEGs (for an example).

我可以轻松地将其编码为视频文件。

I can easily encode this into a video file.

在客户端应用程序上完成编码后，我将FTP上传到我的服务器上。

When it has finished encoding on the client app I FTP upload to my server.

如果我无法将视频文件写入光盘，而是整洁将其写入内存流（或字节数组）并通过Web服务上传？

It would be 'neater' if I could not write the video file to a disc but instead write it to a memory stream (or array of bytes) and upload via web service perhaps?

我已经检查了ffmpeg文档，但作为C＃开发人员，我找不到理解C示例很自然。

I have checked out the ffmpeg documentation but as a C# developer I do not find it natural to understand the C examples.

我想我的第一个问题是可能的，如果可以的话，有人可以在C＃中发布示例代码吗？目前，我正在C＃中使用流程类来执行ffmpeg。

I guess my first question is it possible, and if so can anyone post an example code in C#? At the moment I am using the process class in C# to execute ffmpeg.

推荐答案

您的流程方法已经不错，只需要进行调整：

Your process method is already good, just needs adjustments:

1. 设置 StartupInfo.RedirectStandardOutput = true 和 StartupInfo .UseShellExecute = false 。


2. 而不是输出文件名，请使用 pipe：调用ffmpeg。将其写入标准输出。另外，由于无法再通过文件名确定格式，因此请确保还使用 -f< format> 开关。


3. 开始该过程。


4. 从 Process.StandardOutput.BaseStream （ .BaseStream ，因此 StreamReader 即 .StandardOutput 不会混乱


5. 读取仍在 Process.StandardOutput.BaseStream 中保留的任何内容。
6. / li>
   
7. 利润。

1. Set StartupInfo.RedirectStandardOutput = true and StartupInfo.UseShellExecute = false.
2. Instead of an output file name, call ffmpeg with pipe:, which will make it write to the standard output. Also, since the format cannot be determined from the file name anymore, make sure you use the -f <format> switch as well.
3. Start the process.
4. Read from Process.StandardOutput.BaseStream (.BaseStream, so the StreamReader that is .StandardOutput doesn't mess anything up) while the process is running into your memory stream.
5. Read anything still remaining buffered in Process.StandardOutput.BaseStream.
6. Profit.

我编写了

I coded a thumbnailer a while back (BSD 2-clause), that has actual code that demonstrates this. Doesn't matter if it is an image or a video coming out of ffmpeg in the end.

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