FFmpeg: Difference between revisions

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* [https://www.ffmpeg.org/doxygen/trunk/structAVFrame.html <code>AVFrame</code>] Decoded audio or video data.

* [https://www.ffmpeg.org/doxygen/trunk/structSwsContext.html <code>SwsContext</code>] Used for image scaling and colorspace and pixel format conversion operations.

====Pixel Formats====

[https://www.ffmpeg.org/doxygen/4.0/pixfmt_8h.html Reference]

Pixel formats are stored as <code>AVPixelFormat</code> enums.

Below are descriptions for a few common pixel formats.

Note that the exact sizes of buffers may vary depending on alignment.

=====AV_PIX_FMT_RGB24=====

This is your standard 24 bits per pixel RGB.

In your AVFrame, data[0] will contain your single buffer RGBRGBRGB.

Where the linesize is typically <math>3 * width</math> bytes per row and <math>3</math> bytes per pixel.

=====AV_PIX_FMT_YUV420P =====

This is a planar YUV pixel format with chroma subsampling.

Each pixel will have its own luma component (Y) but each <math>2 \times 2</math> block of pixels will share chrominance components (U, V)

In your AVFrame, data[0] will contain your Y image, data[1] will contain your .

Data[0] will typically be <math>width * height</math> bytes.

Data[1] and data[2] will typically be <math>width * height / 4</math> bytes.

===Muxing to memory===

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 * [https://www.ffmpeg.org/doxygen/trunk/structAVFrame.html <code>AVFrame</code>] Decoded audio or video data.
 * [https://www.ffmpeg.org/doxygen/trunk/structSwsContext.html <code>SwsContext</code>] Used for image scaling and colorspace and pixel format conversion operations.
+====Pixel Formats====
+[https://www.ffmpeg.org/doxygen/4.0/pixfmt_8h.html Reference]<br>
+Pixel formats are stored as <code>AVPixelFormat</code> enums.<br>
+Below are descriptions for a few common pixel formats.<br>
+Note that the exact sizes of buffers may vary depending on alignment.<br>
+=====AV_PIX_FMT_RGB24=====
+This is your standard 24 bits per pixel RGB.<br>
+In your AVFrame, data[0] will contain your single buffer RGBRGBRGB.<br>
+Where the linesize is typically <math>3 * width</math> bytes per row and <math>3</math> bytes per pixel.
+=====AV_PIX_FMT_YUV420P =====
+This is a planar YUV pixel format with chroma subsampling.<br>
+Each pixel will have its own luma component (Y) but each <math>2 \times 2</math> block of pixels will share chrominance components (U, V)<br>
+In your AVFrame, data[0] will contain your Y image, data[1] will contain your .<br>
+Data[0] will typically be <math>width * height</math> bytes.<br>
+Data[1] and data[2] will typically be <math>width * height / 4</math> bytes.<br>
 ===Muxing to memory===