場景
?? ?????在指定編碼格式優化點播的時候，指定像素格式 pFormatContext->streams[video_index]->codecpar->format = AV_PIX_FMT_YUVJ420P;
根據說法deprecated in favor of AV_PIX_FMT_YUV420P and setting color_range，AV_PIX_FMT_YUV420P取代AV_PIX_FMT_YUV420P和設置顏色空間

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int format;

????/**

???? * - video: the pixel format, the value corresponds to enum AVPixelFormat.
???? * - audio: the sample format, the value corresponds to enum AVSampleFormat.
???? */
?? ?

函數調用邏輯

av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)
????????????av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n"); ? ?

區別

AV_PIX_FMT_YUVJ420P和AV_PIX_FMT_YUV420P兩者的不同在于，顏色空間不同。
AVCOL_RANGE_JPEG

/**
* MPEG vs JPEG YUV range.
*/
enum AVColorRange {
?AVCOL_RANGE_UNSPECIFIED = 0,
?AVCOL_RANGE_MPEG??????? = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
?AVCOL_RANGE_JPEG??????? = 2, ///< the normal???? 2^n-1?? "JPEG" YUV ranges
?AVCOL_RANGE_NB,????????????? ///< Not part of ABI
};

YUVJ420P的字面含義是“使用了JPEG顏色范圍的YUV420P，像素使用表示顏色的數值范圍發生了變化。

YUV420p的像素顏色范圍是[16,235]，16表示黑色，235表示白色
YUVJ420P的像素顏色范圍是[0,255]。0表示黑色，255表示白色

宏定義
enum AVPixelFormat {
??? AV_PIX_FMT_NONE = -1,
??? AV_PIX_FMT_YUV420P,?? ///< planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
??? AV_PIX_FMT_YUYV422,?? ///< packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
??? AV_PIX_FMT_RGB24,???? ///< packed RGB 8:8:8, 24bpp, RGBRGB...
??? AV_PIX_FMT_BGR24,???? ///< packed RGB 8:8:8, 24bpp, BGRBGR...
??? AV_PIX_FMT_YUV422P,?? ///< planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
??? AV_PIX_FMT_YUV444P,?? ///< planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
??? AV_PIX_FMT_YUV410P,?? ///< planar YUV 4:1:0,? 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
??? AV_PIX_FMT_YUV411P,?? ///< planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
??? AV_PIX_FMT_GRAY8,???? ///<??????? Y??????? ,? 8bpp
??? AV_PIX_FMT_MONOWHITE, ///<??????? Y??????? ,? 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb
??? AV_PIX_FMT_MONOBLACK, ///<??????? Y??????? ,? 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb
??? AV_PIX_FMT_PAL8,????? ///< 8 bits with AV_PIX_FMT_RGB32 palette
??? AV_PIX_FMT_YUVJ420P,? ///< planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting color_range
??? AV_PIX_FMT_YUVJ422P,? ///< planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting color_range
??? AV_PIX_FMT_YUVJ444P,? ///< planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting color_range
#if FF_API_XVMC
??? AV_PIX_FMT_XVMC_MPEG2_MC,///< XVideo Motion Acceleration via common packet passing
....
}

當前文章：FFmpegdeprecatedpixelformatused問題描述
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