avcodec: encoder: Fix rounding issue

modules/codec/avcodec/encoder.c

@@ -1021,13 +1021,12 @@ static block_t *EncodeVideo( encoder_t *p_enc, picture_t *p_pict )
      * This is done here instead of OpenEncoder() because we need the actual
      * bits_per_pixel value, without having to assume anything.
      */
-    const int bytesPerPixel = p_enc->fmt_out.video.i_bits_per_pixel ?
-                         p_enc->fmt_out.video.i_bits_per_pixel / 8 :
+    const int bitsPerPixel = p_enc->fmt_out.video.i_bits_per_pixel ?
+                         p_enc->fmt_out.video.i_bits_per_pixel :
                          p_sys->p_context->bits_per_coded_sample ?
-                         p_sys->p_context->bits_per_coded_sample / 8 :
-                         3;
-
-    const int blocksize = __MAX( FF_MIN_BUFFER_SIZE,bytesPerPixel * p_sys->p_context->height * p_sys->p_context->width + 200 );
+                         p_sys->p_context->bits_per_coded_sample :
+                         24;
+    const int blocksize = __MAX( FF_MIN_BUFFER_SIZE, ( bitsPerPixel * p_sys->p_context->height * p_sys->p_context->width ) / 8 + 200 );
     block_t *p_block = block_Alloc( blocksize );
     if( unlikely(p_block == NULL) )
         return NULL;