如何使用gst-launch-1.0将I420帧转换为BGRA格式? [英] How to convert I420 frames to BGRA format with gst-launch-1.0?

问题描述

我有一个基于I420格式的原始视频文件，名为video.i420. 我尝试使用gst-launch-1.0将其转换为BGRA格式:

I had a raw video file named video.i420 based on I420 format. And I tried to convert it into BGRA format using gst-launch-1.0:

gst-launch-1.0 filesrc location=video.i420 ! videoparse width=1920 height=816 format=2 framerate=24/1 ! videoconvert ! videoparse format=12 ! filesink location=video.bgra

但是输出文件video.bgra的大小仅比源文件大48个字节.

But the output file video.bgra sized only 48 bytes larger than the source file.

然后我使用以下命令播放了video.bgra:

Then I played the video.bgra with the followed command:

gst-launch-1.0 filesrc location=video.bgra ! videoparse width=1920 height=816 format=2 framerate=24/1 ! videoconvert ! autovideosink

与播放源文件相同.

我为格式转换创建的管道出了什么问题?为什么它没有按我的预期转换?

What's wrong with the pipeline I created for format conversion? And why didn't it convert as I expect？

推荐答案

这是怎么回事:

gst-launch-1.0 filesrc location=video.i420 ! videoparse width=1920 height=816 format=i420 framerate=24/1 ! videoconvert ! video/x-raw, format=bgra ! filesink location=video.bgra

我已将魔术数字更改为人类可读的格式.只是出于可读性考虑，它也应该与数字一起使用.

I have changed the magic numbers to human readable formats. Just for readability, it should work with numbers as well.

除此之外.需要的是告诉videoconvert确定的视频格式.我认为videoparser只是解析数据，但没有对其前任元素强制执行特定的上限.

Aside from that. What is required is to tell videoconvert a definitive video format. I think the videoparser just parses data, but does not enforce specific caps on its predecessor element.

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