C语言 FFmpeg 如何将视频写入文件
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FFmpeg How to write video to a file
提问by NoviceAndNovice
What i want is
我想要的是
1. Get video packet from stream source
2. Decode it
3. And write that decoded data as video file(avi, mpeg etc)
I can able to get video Packets from a file (as AVPacket) and also can decode and save as an image.(raw)( FFmpeg tutorials show how to do it). But i can not( do not know ) write that video data to a file(other) which can be played by media players(such as VLC).
我可以从文件中获取视频数据包（作为 AVPacket），也可以解码并保存为图像。（原始）（FFmpeg 教程展示了如何做到这一点）。 但是我不能（不知道）将该视频数据写入可以由媒体播放器（例如 VLC）播放的文件（其他）。
Best Wishes
最好的祝愿
Ps: Real code samples will be great if possible...
Ps：如果可能的话，真实的代码示例会很棒......
Now i make test with av_interleaved_writebut i got strange error "non monotone timestamps" ( i have no control over pts values of media source )
现在我用av_interleaved_write进行测试， 但我得到了奇怪的错误“非单调时间戳”（我无法控制媒体源的 pts 值）
Some Extra Info
一些额外的信息
In FFmpeg I have to
在 FFmpeg 我必须
- Read media packets from media source ( it may be real file(.avi,mov) or even rtsp server).
- Then write those media packets to a real file (physical .avi, .mov etc file)
- 从媒体源（可能是真实文件（.avi、mov）甚至rtsp服务器）读取媒体包。
- 然后将这些媒体数据包写入真实文件（物理 .avi、.mov 等文件）
I need reader and writer. I can read the media source file ( even encode packets according to given format). But i can not write to file...(which any player can play)
我需要读者和作家。我可以读取媒体源文件（甚至根据给定的格式对数据包进行编码）。但我无法写入文件...（任何玩家都可以玩）
And some pseudoCode
还有一些伪代码
File myFile("MyTestFile.avi");
while ( source ->hasVideoPackets)
{
packet = source->GetNextVideoPacket();
Frame decodedFrame = Decode(packet);
VideoPacket encodedPacket = Encode( decodedFrame);
myFile.WriteFile(encodedPacket);
}
Or Just write the original file without encode decode
或者只写原始文件而不编码解码
File myFile("MyTestFile.avi");
while ( source ->hasVideoPackets)
{
packet = source->GetNextVideoPacket();
myFile.WriteFile(packet);
}
Then
然后
I can able to open MyTest.avi file with a player.
回答by Mixaz
Now there's a new example of video transcoding in doc/examples/transcoding.cof FFmpeg trunk, and it does exactly what you need: API example for demuxing, decoding, filtering, encoding and muxing.
现在在FFmpeg 主干的doc/examples/transcoding.c中有一个新的视频转码示例，它完全满足您的需求：用于解复用、解码、过滤、编码和复用的 API 示例。
This is for the current ffmpeg 2.4.4
这是针对当前的ffmpeg 2.4.4
回答by Aditya P
you need to write an encoder to convert raw data to required video format
您需要编写一个编码器来将原始数据转换为所需的视频格式
回答by Maister
I did something like this at some point using libx264 and vorbis.
我曾使用 libx264 和 vorbis 做过类似的事情。
A code example. https://github.com/Themaister/SSNES/blob/master/record/ffemu.c
一个代码示例。 https://github.com/Themaister/SSNES/blob/master/record/ffemu.c
The basic idea is that you have to set timestamps yourself in the AVFramewhen you want to encode it. Then you can take that packet and write it with av_interleaved_write().
基本思想是您必须在AVFrame要对其进行编码时自己设置时间戳。然后你可以拿那个数据包并用av_interleaved_write().
