[Libav-user] Applied pad on the decoded frame

Dolevo Jay cmst at live.com
Mon Oct 14 13:46:57 CEST 2013

Hi all,

I have encoder and decoder application in separate projects. I use x264 to encode the incoming frames and use libav to decode them. If the frame has a specific resolution like 1366 x 768, the decode frame contains extra black border at the right side of the frame. I have debugged it and realized that the av_pic.linesize[0] is 50 more than the linesize during the encoding. 
Here is the code:

              lengthDec = avcodec_decode_video2(c1, av_pic, &pic, &pkt);    if (pic)
       avpicture_fill((AVPicture *)rgbFrame, RGBimg, PIX_FMT_RGB32, w, h);

       sws_scale(ctx, av_pic->data, av_pic->linesize, 0, h, rgbFrame->data, rgbFrame->linesize);

So, in this code, I decode the packet and convert the decoded data into the rgb. 
Why does the avcodec_decode_video2 returns a padded linesize?
Could anyone tell me how I can eliminate the black border?


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