iOS/WAStickersThirdParty/YYImageCoder.m [2601:2613]:
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            chunk_fcTL.delay_num = chunk_fcTL.delay_num;
            chunk_fcTL.delay_den = chunk_fcTL.delay_den;
            chunk_fcTL.dispose_op = YY_PNG_DISPOSE_OP_BACKGROUND;
            chunk_fcTL.blend_op = YY_PNG_BLEND_OP_SOURCE;
            
            uint8_t fcTL[38] = {0};
            *((uint32_t *)fcTL) = yy_swap_endian_uint32(26); //length
            *((uint32_t *)(fcTL + 4)) = YY_FOUR_CC('f', 'c', 'T', 'L'); // fourcc
            yy_png_chunk_fcTL_write(&chunk_fcTL, fcTL + 8);
            *((uint32_t *)(fcTL + 34)) = yy_swap_endian_uint32((uint32_t)crc32(0, (const Bytef *)(fcTL + 4), 30));
            [result appendBytes:fcTL length:38];
            
            apngSequenceIndex++;
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iOS/WAStickersThirdParty/YYImageCoder.m [2634:2646]:
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                chunk_fcTL.delay_num = chunk_fcTL.delay_num;
                chunk_fcTL.delay_den = chunk_fcTL.delay_den;
                chunk_fcTL.dispose_op = YY_PNG_DISPOSE_OP_BACKGROUND;
                chunk_fcTL.blend_op = YY_PNG_BLEND_OP_SOURCE;
                
                uint8_t fcTL[38] = {0};
                *((uint32_t *)fcTL) = yy_swap_endian_uint32(26); //length
                *((uint32_t *)(fcTL + 4)) = YY_FOUR_CC('f', 'c', 'T', 'L'); // fourcc
                yy_png_chunk_fcTL_write(&chunk_fcTL, fcTL + 8);
                *((uint32_t *)(fcTL + 34)) = yy_swap_endian_uint32((uint32_t)crc32(0, (const Bytef *)(fcTL + 4), 30));
                [result appendBytes:fcTL length:38];
                
                apngSequenceIndex++;
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