从FFmpeg获取视频的宽高比 [英] Get aspect ratio of video from FFmpeg
问题描述
我正在使用FFmpeg将视频从一种格式转换为另一种格式。我需要首先提取视频的宽高比。如何找到这些信息?
I am using FFmpeg to convert a video from one format to another. I need to extract the aspect ratio of the video first. How can I find that information?
推荐答案
只需运行
ffmpeg -i <yourfilename>
,文件中包含的视频流的详细信息将打印到屏幕上。为每个视频流列出的两个参数将是PAR(像素长宽比)和DAR(显示宽高比)。你会看到这样的:
and details about the video stream/s contained in the file will be printed to the screen. Two of the parameters listed for each video stream will be the PAR (Pixel Aspect Ratio) and DAR(Display Aspect Ratio). You'll see something like this:
Stream #0.10[0x258]: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 DAR 16:9], 4350 kb/s, 27.97 fps, 25 tbr, 90k tbn, 50 tbc
DAR是最终显示的视频的比例。 PAR指示像素的尺寸必须如何实现。例如,在刚刚显示的情况下,(720 * 64)/(576 * 45)= 16/9
。
The DAR is what ratio the final displayed video will have. The PAR indicates how the pixels have to be sized to achieve this. For example, in the case I just showed, (720*64)/(576*45) = 16/9
.
很多时候,PAR将等于1:1,这意味着DAR应等于视频分辨率的比例。
Many times, PAR will be equal to 1:1, which means that the DAR should be equal to the ratio of the video resolution.
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