[FFmpeg-user] How can I convert rbg to yuv420p loseless?

[mokacao]

I'm doing a convert picture to MP4 video, the original image is PIX_FMT_BGRA
format, now converted from RGB to YUV420P, I found many black spot around
the picture, the follow is part of the core code, please help me to how to
clear these black dots, or can tell me what information is missing, thank
you.

libffmpeg::SwsContext* swsContext = libffmpeg::sws_getContext( srcW, srcH,
libffmpeg::PIX_FMT_BGRA,codecContext->width, codecContext->height,
libffmpeg::PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);

libffmpeg::sws_scale( swsContext , srcData, srcLinesize, 0, frame->Height,
data->VideoFrame->data, data->VideoFrame->linesize );

original png file
<http://ffmpeg-users.933282.n4.nabble.com/file/n4660765/P0085.png> 

yuv420p image file(scale and clip)
<http://ffmpeg-users.933282.n4.nabble.com/file/n4660765/yuv420p.png> 





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